Home » Archimedes archive » Acorn User » AU 1998-10.adf » Features » SSTV/!PSinstall/PscanFiles/Manual
SSTV/!PSinstall/PscanFiles/Manual
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File contents
00) Pscan version 3.10 - 25th Janaury 1998 - by Paul Turner G4IJE
Index of chapters:-
01 ... Conventions and monitor notes 02 ... Interfaces and serial ports
03 ... An overview of Pscan 04 ... Installation & registration
05 ... Running Pscan 06 ... Receiving SSTV pictures
07 ... SSTV modes explained 08 ... Auto save mode
09 ... Correcting sloping pictures 10 ... Saving and loading pictures
11 ... Transmitting SSTV pictures 12 ... Captions and "QwikText"
13 ... Sprite overlays 14 ... The Choices window
15 ... Hamcolor FAX - general info 16 ... Receiving Hamcolor FAX
17 ... Transmitting Hamcolor FAX 18 ... The PD SSTV modes
19 ... PD modes in Pscan 20 ... The Pasokon P modes
21 ... Test patterns 22 ... RGB processing & misc
23 ... Tools and utilities 24 ... Backgrounds
25 ... Grab screen area 26 ... Miscellaneous
27 ... Adding more picture memories 28 ... Keyboard shortcuts
29 ... JPEG loading - more details 30 ... Mono (black & white) FAX
31 ... Masked text sprites 32 ... Thumbnails
33 ... Experimental SSTV repeater 34 ... *** New in version 3.10 ***
35 ... Author and registration info
Note: This user guide can be accessed by pressing the H key when running
Pscan or from the "Tools and utilities" menu.
01) Conventions and screen modes
Conventions used in this manual:-
Select - the left mouse button
Menu - the middle mouse button
Adjust - the right mouse button
Drawfile - a drawing created using !Draw (filetype &AFF)
Click - a single brief click on select
Double-click - two clicks on select in quick succession
Drag - hold select and move the mouse
Long-click � - hold down select for about 1-2 seconds
� Because IRQ interrupts are disabled during RX and TX operations, a
standard brief click might be missed.
Important note: A number of extra files and programs are included in a
directory called "Extras" which is located inside the !Pscan application.
To access these files, hold down the SHIFT key and double-click on the
!Pscan application. The Extras directory is referred to several times in
this document.
Pscan will run on a Risc PC fitted with an ARM610, ARM710 or StrongARM
processor, and Risc OS 3.50, 3.60 or 3.70. A minimum of 4�MB of RAM is
required - 8 MB or more is beneficial but not essential - plus 1 MB of
VRAM. Unfortunately Pscan cannot be used on earlier Acorn computers, such
as the A3000, A4000, A5000 etc.
The code has been written to give full performance on an ARM610 and OS 3.
50. Therefore the faster processors will not give any significant
improvement in picture quality - it's very, very good anyway! However, as
most of the code not directly concerned with receiving or sending pictures
is written in BASIC, the program will "feel" much faster when used on a
StrongARM machine.
Pscan requires a screen mode that is 640 x 512 x 32768 colours (16 bpp) for
full-spec operation. This mode is not available as standard when running
the Acorn AKF60 monitor, but a replacement monitor definition file for the
AKF60 is supplied in the Extras directory. As well as defining the 640 x
512 SSTV mode, this file also includes some other useful mode definitions
written by Ben Summers, G0SOQ. These allow many of the old-style Archimedes
modes (such as 12, 13 and 15) to be displayed at full height, rather than
in "letterbox" mode.
An equivalent file is also supplied for the Acorn AKF85 17" monitor. In
this case it will probably be necessary to adjust the position of the new
640 x 512 screen mode, but this is easily done using the front panel
controls. The new "non-letterbox" modes will also need adjustment. These
adjustments only need to be carried out once as they are stored inside the
monitor's memory and called up when required. Consult your AKF85 user guide
if you need help with these adjustments.
If you are NOT using an Acorn AKF60 or AKF85 monitor, it is probably best
if you do not attempt to install the AKF60 or AKF85 monitor definition
files. It appears that the Acorn AKF50 and AKF52 monitors already support
640 x 512 screen modes, so these monitors may be usable with Pscan with no
changes to monitor definition files. See the !ReadMe inside the Monitors
directory for the latest information regarding monitor definition files.
Contact G4IJE if you need further advice on this matter.
If a 640 x 512 screen mode is not available Pscan will automatically select
a 640 x 480 mode instead. However, this should be considered a temporary
measure as some program features will not work correctly with less than 512
screen lines available. Most of the popular SSTV modes use 256 scan lines
and Pscan plots each received line twice to fill the screen. When running
in a 480 line screen mode some received picture lines will be lost.
Transmit works reasonably well in 640 x 480 mode, although the top few
lines of the picture will be sent twice; once at the start of the
transmission and again at the end.
Installing the new AKF60 or AKF85 MDF file:
To install a new monitor definition file, you must first locate your
existing AKF60 or AKF85 MDF file. On an early model Risc PC 600 these are
located inside the !Boot file and it seems likely that this will still be
the case on newer machines. The full pathname of the required directory is:-
ADFS::HardDisc4.$.!Boot.Resources.Configure.Monitors.Acorn
Inside this directory you should find a number of text files, including
AKF50, AKF52, AKF60 and AKF85. Very carefully rename the AKF60 file to
AKF60old (or AKF85 to AKF85old as appropriate). You may need to set the
file access to "unprotected" to do this; change it back to "protected"
afterwards. Do NOT delete this file, just in case you need it again.
In the Extras directory inside !Pscan is a directory called Monitors -
inside that are the new AKF60 and AKF85 monitor definition files. Drag the
required file into the hard drive directory occupied by the AKF60old (or
AKF85old) file and the other monitor definition files.
The new AKF60 (or AKF85) file is now ready for use and will be installed
during the next reset. When the Display manager icon is clicked, the window
shown will now be titled "Acorn AKF60 Plus" (or "Acorn AKF85 Plus") and the
list of screen modes available in the "Resolution" menu will include
"640�x�512 SSTV".
02) Interfaces
Pscan requires only a very simple and cheap interface, which is plugged
into a serial port on the computer. Circuit diagrams of two alternative
interfaces are supplied in Drawfile format in the Extras directory. Both
types are powered directly from the serial port and no additional power
supply is required.
The "HamComm" circuit is used with a number of programs on the PC, such as
JVFAX, GSH-PC and (obviously) HamComm. Only one op-amp and a few diodes,
resistors and capacitors are required. For RX-only operation, you can omit
the PTT transistor and the associated capacitor, resistor and diode, plus
the six components that filter the signal from the TXD pin. Although a 741
op-amp is shown, virtually any modern op-amp will give equal (or better)
performance, such as the TL071 or LF351.
The "PscanIF2" Drawfile shows the circuit of a slightly more complex
interface designed specifically for use with Pscan. This gives a small
improvement in receive picture quality and incorporates an extra divide-by-
four circuit in the TX audio path. This option allows the Pscan software to
generate the TX tones at four times the required frequency which improves
the overall TX quality considerably. This is particularly noticeable on
sharp vertical edges. A PCB design for PscanIF2 interface is available (in
Drawfile format) from G4IJE. See the last chapter in this manual for
contact details.
If using the PscanIF2 circuit it is important that the "74HC74 TX divider"
option in the Pscan Choices window is ticked. See chapter 14 for more
information on the Choices window.
Although I strongly recommend using the PscanIF2 interface for best
possible results (particularly on transmit) I will continue to support the
simpler HamComm-style circuit in all future versions of Pscan.
Please note that Pscan can ONLY be used with this type of "HamComm
compatible" interface. It is not possible to use a TNC, a modem or a multi-
mode data�controller with Pscan. Circuit diagrams of "enhanced" versions of
the HamComm interface have been published in the amateur radio press, and
as long as these are suitable for use with JVFAX and GSH-PC they will also
work with Pscan.
The interface may be plugged into either the built-in Risc PC serial port
or an Atomwide serial port card. Other add-on serial cards based on the
TL16C550 device may work if their hardware addresses are the same as the
Atomwide card. The serial port options in the Pscan Choices window must
match the port that the SSTV interface is plugged into. The built-in Risc
PC serial port is assumed by default, but see chapter 14 for more
information on the Choices window.
Although most serial port buffer chips of the 1488 / 1489 type are quite
robust, do take care with the interface wiring. The author of Pscan cannot
accept any liability for damage resulting from the use or misuse of the
interface circuits supplied with this Pscan package.
It is possible that some programs that use the built-in serial port (packet
terminal programs for example) might cause a problem if the Pscan interface
is subsequently connected. As the PTT signal is derived from the RTS
signal, any software that leaves the RTS line high will cause the PTT line
to be keyed. Hopefully, such programs will "release" the serial port when
they are closed down - this is certainly the case with !Term93 version 4.00
from G4RQN - but some may not. If this proves to be a problem, the only
easy solution is to re-boot the computer after running other applications
that use the serial port.
It seems that the RTS line on Atomwide serial ports goes high by default.
Depending on the interface configuration, this may also cause an unwanted
transmit condition to occur. This will clear when Pscan is installed on the
icon bar, assuming that the serial port configuration in the Choices window
is correctly set.
03) An overview of Pscan
The sending and receiving of SSTV using only a simple interface is very
demanding, requiring the full power of the ARM processor. For this reason
it is not possible for the Pscan software to allow multitasking, and it
will take over the computer completely whilst it is running. However, Pscan
does install on to the icon bar, making it very easy to go from the desktop
to Pscan and then back to the desktop again. Running Pscan will not affect
any work that is in progress on the desktop.
Pscan has to disable the IRQ interrupts whilst receiving or sending
pictures, and during these times the mouse pointer will freeze. However,
the software checks the status of the mouse buttons regularly, and a long-
click on select will abort RX or TX operations. The escape key is enabled
whilst Pscan is running so it is possible to escape from most other Pscan
operations if required.
The menus used in Pscan do not quite conform to the Risc OS standard but
are none-the-less easy to use. All menus have a [Close menu] option as the
first and last entries, and clicking on these closes the menu. Sub-menus
are indicated by an arrow adjacent to a main menu option and are opened in
an identical way to standard Risc OS menus. To close a sub-menu, move the
mouse pointer out of the left side of the menu; as the sub-menu closes
control passes back to the main menu. Sub�menus are always drawn with their
bottom edge level with the bottom edge of the main menu. This is at
variance with the Risc OS standard but it shouldn't pose too many problems
in practice.
As already mentioned, Pscan uses a 32k-colour mode. However, the colour
count is increased by using a real-time dithering technique which gives the
impression of 63 shades (or levels) of red, green and blue, equivalent to
250047 colours. The dithering is applied automatically in all SSTV and FAX
modes giving very smooth colour transitions with no signs of contouring
effects. The dither pattern is very fine and completely invisible unless
the picture is magnified considerably.
04) Installation and registration
Starting with version 3.0, Pscan is installed via an installation program
called !PSinstall. This allows either a full installation to be carried out
or an existing version to be upgraded. If you are reading this you have
probably already installed Pscan correctly. See the ReadMe file that
accompanies !PSinstall if you have any problems with the installation of
Pscan.
To start Pscan, double-click on the !Pscan application and it will install
on to the right-hand side of the icon bar. A short icon bar menu is
available, which includes Info, Help, Manual, Register, Choices and Quit
options.
The "Choices..." option displays the main Pscan configuration window where
a number of program parameters can be defined. If you intend to connect
your SSTV interface to an Atomwide serial card, you should see chapter 14
for details of how to configure the serial port, otherwise the default
parameters will be OK to start with.
The "Register..." option allows registered users of Pscan to customise the
program so that their callsign appears in the top left corner of the screen
when transmitting SSTV. Registered users are issued with a PIN number which
allows any shareware version of Pscan (from version 3.10 onwards) to be
converted into a registered version. To do this, click on the Register
option in the icon bar menu and then enter your callsign, PIN and name in
the registration dialogue box. Click OK when ready and the registration
process will be quickly carried out. If you click on the "info" option in
the icon bar menu you should now see your name and callsign in the "owner"
box, and when transmitting SSTV your callsign will be placed in the top-
left corner of the picture.
The registration process only needs to be carried out once as you receive
each new version of Pscan. If you subsequently select the Register option
again you will find that the information you entered the first time will
NOT be displayed in the dialogue boxes. This is deliberate; it prevents a
guest from seeing your PIN number and also means that it is not necessary
to store your PIN number within Pscan.
If you are not already a registered Pscan user, see chapter 35 for more
information.
05) Running Pscan
A single click on the Pscan icon on the icon bar will start the program.
The opening screen will be displayed and a tool bar will be drawn at the
bottom of the frame. All the features of Pscan are accessed from the tool
bar by clicking select (the left mouse button) over the various icons.
The first eight buttons on the left of the tool bar are used to select the
required picture memory. Up to eight pictures can be stored in memory at a
time, although this requires a computer with at least 8 MB of RAM fitted.
Pscan is normally supplied with the number of picture memories set to
three, as this allows the software to run on a 4 MB machine with some
memory to spare. If less than eight memories are configured, the unused
buttons will be blank and clicking on them will have no effect. Details of
how to change the number of picture memories are given in chapter 14 ("The
Choices window"). See also chapter 27 for details of how to temporarily
increase the number of picture memories without using the Choices window.
The tool bar can be removed temporarily by clicking select with the mouse
pointer positioned anywhere above the tool bar. This allows the bottom
lines of a picture to be examined. Click select again to restore the tool
bar.
Pictures can be transmitted from any of the picture memories and also
received into any memory. All loading, saving and graphics work is always
carried out on the currently selected picture memory.
06) Receiving SSTV pictures
There are three ways of initiating picture reception; a "VIS" start, a
"manual" start and an "auto-mode-find" start. Virtually all modern SSTV
equipment sends a VIS code at the beginning of the frame which signals to
the receiving equipment which of the many SSTV modes is being used.
Although not foolproof, it does allow the correct mode to be selected
automatically most of the time. However, the VIS can become unreadable
under poor conditions, so it makes sense to select the correct mode before
the transmission starts. This is done by clicking on the mode select
button, which is the yellowish box on the tool bar where the currently
selected mode is shown. The mode select menu will be displayed from which
the required mode can be chosen. In Europe, almost all SSTV on the HF bands
uses the Martin�1 mode, and this can be assumed unless told otherwise.
You may like to clear the screen before receiving a picture. This is done
by clicking on the menu (middle) mouse button; the position of the mouse
pointer is not important. Although the screen will be cleared to a dark-
grey (apart from the tool bar) the contents of the currently selected
picture memory can be restored by clicking on the appropriate memory select
button on the tool bar.
To use the VIS start-up method, click on the VIS box on the tool bar. A
flashing green "LED" indicator will be displayed, showing that the software
is scanning the incoming audio for a valid VIS code. If you want to cancel
VIS mode, click the left mouse button. Once a VIS has been found, the LED
will change to a steady red and picture reception will begin.
If the VIS is missed, possibly due to QRM or QSB, a manual start will be
necessary. To do this, first click on the VIS box to cancel VIS start mode,
and then click on the R box. This initiates a manual start and the software
will lock on to the first line sync pulse it finds and picture reception
will begin.
An "auto mode find" feature is also available which will attempt to
identify the correct SSTV mode even if the VIS has been missed. To activate
the auto mode find, click on the R icon with ADJUST (the right mouse
button). If a valid SSTV signal is found, Pscan will switch to the correct
mode and picture reception will begin. This might take a few seconds,
depending on the mode being sent and the signal-to-noise ratio. If no
signal is identified in 15 seconds the auto mode find will be cancelled.
Although the auto mode find is very effective, it is best to use the normal
"manual" start option (click the R icon with select) if you are fairly sure
you know which mode is being used and you already have that mode selected.
Also, the sync pulse detector used in the auto mode find is a little more
demanding than the normal one, which is necessary to prevent false starts.
This means that noisy signals that might be just good enough to trigger a
normal manual start will not trigger the auto mode finder.
Under very poor signal conditions, a "bad start" can sometimes occur. This
can cause the incoming picture to be wrongly positioned and for parts of
the picture to be displayed in the wrong colours. If this happens, hold
down adjust (the right mouse button) until the scan stops and then release
it. This causes a "re-sync" and the software will again lock on to the
first valid line sync pulse that it finds.
Once reception of the picture has started a tuning indicator window will be
displayed just above the tool bar. This can be used to make minor tuning
adjustments when receiving pictures on SSB. The position of the white bar
on the tuning indicator is determined by the frequency of the sync pulses
in the incoming signal. The tuning indicator scale is marked at 50 Hz
intervals; for best results an error greater than 50 Hz should be avoided
if possible. Please note that the "Hi" and "Lo" legends and the plus-or-
minus figures refer to the pitch of the audio, rather than the actual RF
frequency error, as the direction of the error depends on whether upper or
lower sideband is being used. Accurate tuning is quite important in all
SSTV modes, although the PD modes (described later) have an auto-tune
facility and good pictures can still be obtained with a tuning error of up
to 150 Hz.
It is important to understand the limitations of this type of tuning
indicator. If the incoming picture is wrongly positioned on the screen - as
might be the case under poor conditions - the tuning indicator will give an
erroneous reading. A badly sloping picture will also confuse the indicator,
as will QRM and QSB. On the lower frequency bands - particularly 80
metres - phase distortion can cause the tuning indicator to jump around
wildly, giving the false impression that the received signal is varying in
frequency. Despite these limitations, the tuning indicator does allow
really precise tuning of moderate to strong SSTV signals, and with
experience it is easy to discriminate between genuine tuning errors and
indicated errors caused by other factors. It is worth remembering that an
erroneous reading will usually show up as a "Hi" reading. An indicated "Lo"
reading is probably correct, unless a strong low�pitched carrier is
interfering with the SSTV signal.
When the incoming picture reaches the tuning indicator it will stop working
and the window will be simply overwritten by the picture.
Picture reception will stop automatically when the scan reaches the bottom
of the screen, but it can be stopped at any time by long-clicking select.
If reception is stopped before 10 lines of picture have been received, the
original contents of the currently selected picture memory are displayed
and the few lines that have been received are lost. This feature is
provided so that an accidental click on the R box does not erase a wanted
picture - there is time to abort the receive process before the currently
displayed picture is overwritten. If the number of lines received is
greater than 10 but less than the full number of lines for the SSTV mode
being used, the remaining screen area is filled with dark grey.
Note that as Pscan has to disable interrupts during SSTV reception, the
mouse pointer will be frozen, although some response to a long mouse button
click will always occur. The mouse pointer will also be frozen whilst
waiting for a valid VIS code to be received.
07) SSTV modes explained
Pscan supports all of the most popular colour SSTV modes, plus three colour
FAX modes and several new high-resolution SSTV modes. At present Pscan does
not include any of the old-style black-and-white SSTV modes.
Here is a brief summary of some of the supported modes:-
Martin 1: Currently the most popular SSTV mode in Europe. Pscan uses a
resolution of 320 pixels per line in this mode, as do most other computer-
based systems. 256 lines are sent, giving medium-resolution colour pictures
in just under 2 minutes. The Martin 2 mode takes only 1 minute to send a
picture, but the picture is softened somewhat compared to Martin 1.
Scottie 1: In principle this mode is very similar to Martin 1 and provides
similar quality pictures. Although occasionally used in Europe, it is more
popular in the USA and Asia. The resolution is 320 x 256, the same as
Martin�1. The Scottie 2 mode gives marginally better pictures than Martin
2, simply because the frame time is a little longer.
Scottie DX: This mode takes 4.5 minutes to send a frame, giving some
improvement in picture sharpness compared to the Martin 1 and Scottie 1
modes. However, there is no real increase in resolution as the number of
lines sent is still 256. Pscan again displays 320 pixels per line in this
mode.
SC2-180: This 3 minute mode also gives a small improvement in picture
quality compared to Martin 1 and Scottie 1 and is a worthwhile alternative
to Martin 1 when extra sharpness is required.
WR180 - JVFAX: Although the JVFAX program supports the SC2-180 mode
(calling it "WR180" in the mode select menu) it suffers from a small but
significant timing error. This causes heavy colour fringing on vertical
transitions when JVFAX transmissions are received on Pscan, and similar
effects are seen by JVFAX users when receiving SC2-180 transmissions from
Pscan. This problem is unique to JVFAX; most other systems adhere much more
accurately to the proper SC2-180 timings.
To allow SC2-180 mode pictures to be exchanged with JVFAX stations without
colour fringing, Pscan includes a "WR180" mode which uses the JVFAX
timings. Only use it when receiving from, or sending pictures to, JVFAX
users.
As the same VIS code is used for "proper" SC2-180 mode and the JVFAX WR180
mode, it is necessary to pre-select WR180 from the mode select menu before
attempting to receive a picture. Upon receipt of the relevant VIS code,
Pscan will go into SC2-180 mode UNLESS the currently selected mode is WR180.
To transmit a picture in WR180 mode, select the mode from the mode select
menu and then click on the T icon.
PD modes: These high-resolution modes were developed jointly by G4IJE and
Don Rotier, K0HEO, who is the author of the "WinPix Pro" SSTV program for
the PC. At the time of writing (26.12.96) the PD modes are not available in
any SSTV programs apart from WinPix Pro and Pscan. Full details are given
in chapters 18 and 19.
P modes: These high-resolution modes were introduced in Pasokon version 3
and are also included in WinPix Pro and the "EZ SSTV" program. No other
SSTV system currently supports these modes. See chapter 20 for more details.
HQ modes: Recently introduced by Martin Emmerson, G3OQD, these modes are
mainly in use by users of the Robot 1200c and Superscan 2001 scan
converters. HQ1 and HQ2 both have an inherent resolution of around 320 x
256 and give similar results to the PD90 mode. Pscan implements these modes
on receive only.
Not all SSTV programs use the same name for the popular modes. Here is a
table of equivalents for Pscan, JVFAX and GSH-PC:-
Generic name Pscan name JVFAX name GSH-PC name
----------------------------------------------------------------
Martin 1 or M1 Martin 1 MARTIN 1 M1 col Martin
Scottie 1 or S1 Scottie 1 SCOTT. 1 S1 col Scottie
Scottie DX Scottie DX SC. DX DX col Scottie
Wraase SC2-180 SC2 180 seconds� WR180 180 col SC-2
HamColor FAX Colour FAX 360LPM HamColor mode 4 Not implemented
�As mentioned above, Pscan also has a "WR180" mode available which uses the
same timings as the JVFAX WR180 mode.
See chapter 15 for details of the "Hamcolor FAX" modes.
08) Auto-save mode
An "auto save" feature is available which will allow pictures to be
received and saved automatically. To activate auto save, click on the
"tools" icon (the paintbrush and spanner icon) and then highlight and click
on the "Auto save mode (SSTV)" option in the tools & utils menu. A tick is
used to indicate that auto save is on.
When the tools & utils menu is closed (by clicking on [Close menu]) the
green VIS "LED" indicator will be illuminated and the letters on the VIS
box will change to AUTO. Once a valid VIS code has been found, the picture
will be received as normal. When the end of the frame is reached, the
picture will be saved in JPEG format into the directory specified in
Choices window. The date and time will be used as the filename, the format
used will produce a filename similar to "Oct23-2130".
After the picture has been saved, the picture memory number will be
incremented by one (or changed to 1 if the highest available has just been
filled) and the software will again search for a valid VIS code. This
process can continue indefinitely, filling up all the available picture
memories and saving each received picture to disk. If the number of
received pictures exceeds the number of memories available, the most recent
picture will simply overwrite the oldest, although ALL pictures are of
course saved to disk. To cancel auto save mode click select, either when
the AUTO LED is green or during picture reception.
Please bear in mind that the VIS system is not foolproof. Noise, QRM, or
tuning errors can spoil the VIS code which will result in a "false start"
or no start at all, causing pictures to be missed. This is most likely to
be a problem when monitoring a large group of SSTV stations, as differences
of a few hundred Hz between stations in a "net" are quite common. The VIS
detector in Pscan can tolerate a tuning error of approximately 150 Hz,
which seems to give a good compromise between sensitivity and
susceptibility to false triggering. Auto save really comes into its own on
2 metres FM, where no tuning errors can occur.
09) Correcting sloping pictures
Having received your first few pictures, probably in Martin 1 mode, you may
find that they are sloping slightly. All modern SSTV modes rely on accurate
timing in the sending and receiving equipment to keep the picture straight.
Although most SSTV modes transmit line sync pulses, these are usually
ignored, as better quality pictures can be received without them. By using
this "free�running" or "asynchronous" method it is impossible for the
picture position to be changed due to noise or QRM, both of which can
produce spurious sync pulses.
All SSTV timing in Pscan is done using a 16 bit counter (part of the IOMD
chip) which is clocked at 2 MHz. This clock is quite stable but the
absolute frequency can vary a little from one computer to another. To
compensate for this, there is an entry in the Choices window line where the
clock frequency of the computer can be entered. This value is then used for
all SSTV timing calculations. The clock value required for a particular
computer can easily be found experimentally by receiving a few SSTV
pictures from a station with known accurate timing.
To display the Choices window, click menu (middle mouse button) over the
Pscan icon on the icon bar and then select the Choices... option. The clock
frequency entry is in the "General" section; the frequency can be typed in
or the up/down icons can be clicked until the required frequency is
displayed.
If an incoming picture appears to move slightly to the LEFT as the scan
progresses, the clock frequency value needs to be REDUCED slightly.
Conversely, if the incoming picture moves slightly to the RIGHT as the scan
progresses, the clock frequency value needs to be INCREASED. To begin with
it is probably best to try a change of say 10 Hz and then receive another
picture. In general, it seems that most Risc PC 600 clocks are slightly on
the high side, although this may not be the same on all models of Risc PC.
Once the correct value is found, make a note of it and keep it in a safe
place. This will save time and avoid the possibility of sloping pictures
should you ever need to re-install Pscan from scratch.
10) Saving and loading pictures
To save a received picture, click on the "filing cabinet" icon at the far
right end of the Pscan tool bar. This displays the filer-screen, where all
picture saving and loading operations are performed. A small "monitor"
display, complete with 8 memory select buttons, will be shown in the bottom
left corner of the screen. This allows a final check to be made that the
correct picture is being saved, or that the correct memory is selected
before loading a picture.
A catalogue of files in the currently selected directory will be displayed
on the filer-screen, along with a small icon indicating their filetype.
However, only files that are relevant to Pscan will display their standard
icon, others will show a red cross on yellow background indicating that
they cannot be loaded by Pscan. Relevant filetypes are Sprites, Targa
files, JPEG files, directories and "Pscan format" received picture files.
Directories are shown in the filer list alongside the usual blue folder
icon, as used on the desktop. Clicking on a directory displays a list of
the files inside it and that directory becomes the currently selected
directory. To move back to the "parent" directory, click on the UP box. A
ROOT box is also provided to move to the root directory. By clicking on
directories and using the UP box it is possible to access any directory on
the current drive. ADFS drives 0, 1, 4 and 5 can all be selected if
available. The "UD" box is provided to allow a "user defined" drive to be
used, such as a SCSI drive or CD-ROM, the full pathname of which must be
set in the Choices window. By default this is set to "NONE". The most
useful entry here might be something like CDFS::0.$ to allow access to a CD-
ROM drive. Pscan will automatically detect PC-style filenames which end in
/JPG, /JP or /J and will correctly identify them as JPEG files, even though
they do not have the usual &C85 filetype.
Note: It is possible to access any pathname on any drive/filing system. See
the appendix at the end of this chapter for more details.
A new directory can be created by clicking on the blue directory icon
located between the ROOT and UP icons. After a name for the new directory
is entered, it will be created as a sub-directory of the currently-
displayed directory. The new directory then becomes the currently-selected
directory.
To save a picture into the currently selected directory, click on the SAVE
button. A dialogue box will be displayed which includes five "radio
buttons" allowing different file formats and picture resolutions to be
chosen. The choice of format should be based on the type of picture being
saved, as described below:-
Sprite 640 x 512 (16 bpp)
This format is suitable for all received pictures, regardless of the
SSTV/FAX mode that was used. Filesize is 640k.
Targa 640 x 512 (16 bpp)
This format is supported by many PC graphics programs so it may be useful
if images are to be transferred to other computers. As with the Risc OS
sprite format, it is suitable for all received pictures and the filesize is
640k.
Pscan 320 x 256
This format reduces the filesize to 160k but it can only be used to save
pictures received in the "standard" SSTV modes, such as Martin 1, SC2-180
etc. It cannot be used to save FAX, PD or P mode pictures as resolution
will be lost. Files saved in this format have a filetype of &96A and a
small "SSTV" icon will be shown in the Pscan filer display. Although
pictures saved in this format occupy more disk space than most JPEG files
(see below), they can be saved and loaded much faster than JPEG files. Note
that this format is unique to Pscan and no other programs - not even the
ubiquitous ChangeFSI - can handle it. Do not try to use this format to save
640 x 512 or 640 x 480 pictures that are intended for transmission, as
rather strange looking pictures will result.
JPEG 640 x 512
The JPEG format is what is known as a "lossy" compression format, which
means that some information is lost when pictures are saved using this
technique. However, the losses are not noticeable on an average picture and
this format offers a considerable reduction in filesize. A typical SSTV
picture will be reduced to about 60-70k when saved in JPEG format. The JPEG
"quality" factor can be changed if required, although the default setting
of 75 usually offers the best compromise between filesize and picture
quality. Saving a 640 x 512 JPEG takes about 8 seconds, but loading is very
much faster. See chapter 29 for the latest JPEG information.
JPEG 320 x 256
This format can be used to save standard-mode SSTV pictures but not those
received in FAX, PD or P modes. The number of colours in the image is
reduced somewhat as the dithering is lost when the picture is saved. This
format is not recommended for general use as image quality will deteriorate
slightly, although it could be used if a particularly small filesize is
necessary.
Sprite overlay
This option is for saving sprite overlays only. The button will be "greyed
out" if a suitable sprite overlay does not exist. See chapter 31 for
details of sprite overlays.
A suitable filename can be entered in the dialogue box, using the delete
key to correct mistakes or CTRL+U to delete the entire line. The usual ADFS
limit of 10 characters per filename applies and the software will prevent
more than this being entered. Hitting <return> or clicking on the SAVE box
will save the contents of the currently-selected picture memory into the
currently selected directory. Click on CANCEL to abort the save if required.
Pscan will allow a picture to be saved with the same filename as an
existing file; the new one will simply overwrite the old one. However, if
an attempt is made to save a picture using the same name as an existing
directory, an error message will be displayed.
To load a picture into the currently selected picture memory, simply
highlight and click on the required picture file in the filer list. Only
Sprite, Targa, Pscan format and JPEG files can be loaded; use ChangeFSI to
convert other formats. JPEG pictures of virtually any size can be loaded
and they can be scaled or cropped to the required size. However, I
recommend that "library" JPEG images of the type found on PC CD-ROMs are
processed using ChangeFSI, as they generally need some gamma correction and
pre-sharpening for best results. More information on converting pictures
for use on SSTV can be found in the next chapter.
If a picture file is clicked with select, the picture is loaded and the
program returns to the main screen. If the file is clicked with adjust, the
picture is loaded but control remains with the filer-screen.
Many JPEG images supplied on PC CD-ROMs have rather meaningless filenames,
such as PEO001 for example. When browsing through a large number of such
pictures it is very easy to lose track of which pictures have already been
viewed. To help avoid this problem, the last image loaded will be indicated
by a tick beside its filename in the filer list.
If menu is clicked over a picture file (not a directory), info on that file
will be displayed along with boxes offering DELETE, RENAME and CANCEL
options. To close the filer display and return to the main screen click on
the CANCEL box. The function of the "QUIT to DESKTOP" box is obvious.
If a directory name includes the letters "SSTVfonts", Pscan will install
any fonts that are held in that directory when it is clicked in the filer
display. This allows fonts which are mainly used for SSTV captions to be
loaded without leaving Pscan. Suitable names are SSTVfonts1, SSTVfonts2
etc. Note the combination of upper and lower case letters; this must be
adhered to.
Pictures can also be loaded using a "thumbnail" system. See chapter 32 for
more details.
Appendix to chapter 10 - accessing additional filing systems
------------------------------------------------------------
It is now possible to access filing systems which are not provided by the
four ADFS buttons or the user-defined pathname. To do this, click the mouse
button anywhere in the mauve bar at the top of the filer-screen, where the
pathname is displayed. Any required pathname can now be typed in, such as
CDFS::0.$ or SCSI::4.$.Images. Pathnames must have at least 7 characters
(but no more than 46) and should not have a full-stop as the last
character, although this will be removed automatically if it is included by
mistake. The delete or backspace keys can used to correct mistakes and the
complete line of text can be cleared by pressing CTRL+U. To abort the
process and leave the pathname unchanged, click adjust (anywhere) or click
on the Cancel box at the right end of the pathname bar.
When the required pathname has been entered, press return or TAB or click
select. If a valid pathname has been entered, the contents of the specified
directory will be displayed on the filer-screen, and pictures can be loaded
and directories opened as normal.
The specified pathname will remain in use until a different one is chosen
(possibly by clicking on the usual drive icons) or Pscan is closed down.
Also provided is a list of up to 14 pathnames which can be stored and
called up as required. The list is stored in a text file called "Pathnames"
which is located inside the "UserFiles" directory, which is inside the
!Pscan application. The Pathnames file can be modified either from within
Pscan (which is preferable) or by dragging the file into Edit or a similar
text editor. The file looks something like this:-
ADFS::0.$
ADFS::1.$
ADFS::4.$
ADFS::5.$
ADFS::6.$
ADFS::7.$
CDFS::0.$
CDFS::1.$
SCSI::4.$
SCSI::5.$
SCSI::6.$
SCSI::7.$
CFS#ADFS::4.$
SparkFS#ADFS##4.$.Spark.!new/arc:$
To activate a pathname from the list, click on the "menu" icon on the filer-
screen path block. A list with 16 options will be displayed. The top option
is [Cancel] and the second entry allows the default pathname (as given in
the Choices window) to be accessed. The remaining 14 entries are taken
directly from the "Pathnames" file.
To change an entry in the pathnames list, click on it with adjust (the
right mouse button) and then modify the text as required. Any valid
pathnames (that are available on YOUR computer) can be entered, including
those on compressed filing systems, such as the !SparkFS and !CFS entries
shown above. Press return or click select to finish, or click adjust to
abort and leave the pathname unchanged. Note that the top two entries
cannot be edited.
The pathnames list can also be modified using Edit - or a similar text
editor - if required. As mentioned earlier, the file is stored inside the
UserFiles directory inside !Pscan. Take care to retain the format as shown
above with exactly 14 entries.
11) Transmitting SSTV pictures
To transmit the picture currently displayed, check that the required SSTV
mode has been selected and then click on the T icon on the tool bar. A
blue�and�yellow dotted cursor line will start to move down the screen,
indicating the progress of the transmission. If you are a registered Pscan
user, your callsign will be printed in the top left corner of the screen.
If you have not yet registered the software, the word PSCAN will be
displayed instead. At the end of the frame the transmission will stop
automatically, although it can be stopped earlier by clicking select. Note
that the mouse pointer will be frozen during transmission.
During transmission the open-collector PTT transistor in the interface will
be turned on. Most solid state rigs can be keyed directly by this signal,
or it can used to pull in a small relay wired to give automatic changeover
from voice to SSTV.
It may be a good idea to send a test card as a first try at transmitting
SSTV. This is available, along with several other test screens, in the test
pattern menu, which is accessed by clicking on the "greyscale" icon just to
the right of the T icon.
Pictures for transmission can be loaded from any directory using the filer
display. A fairly limited range of picture formats and sizes is supported
by Pscan, but picture files that cannot be loaded directly can be easily
converted using ChangeFSI. The ideal format for Pscan is a Risc OS sprite
with 32k�colours and a resolution of 640 pixels by 480 lines. This leaves
room for a greyscale to be placed at the top of the screen, which provides
a useful tuning aid for the receiving station.
To convert pictures into a suitable format for Pscan, proceed as follows:-
Using the display manager, set the desktop mode to 640 x 480 with 32
thousand colours. Install ChangeFSI and click menu over the ChangeFSI icon
on the icon bar. Go to the "Scaling" sub-menu and click on the option
labelled "Scale to fill 640 x 480". Ensure that the "Lock picture aspect"
option is NOT ticked.
Although not essential, many pictures that are NOT in Risc OS format will
benefit from some of the processing facilities provided in ChangeFSI. The
most useful are the "Expand dynamic range" and "Pre-sharpening" options,
both included in the "Processing" sub-menu. A pre-sharpening value of about
20 is often beneficial, particularly when processing JPEG files.
Having set the scaling and processing options, drag the picture file on to
the ChangeFSI icon. When the conversion is complete, click menu over the
picture and choose the "Save sprite" option. Enter a suitable filename and
drag the sprite into the required directory.
An alternative - and in some ways preferable - method of creating images
for use on SSTV is to use the !CropPix application which is supplied in the
Extras directory. A !ReadMe file is included which describes its use.
One final point to remember when transmitting SSTV is that the resolution
available in most modes is rather less than the actual screen resolution of
Pscan. All the "standard" SSTV modes (Martin, Scottie, SC2-180 etc) use 256
lines whereas the Pscan display uses 512 lines. Most SSTV systems use 256
or 320 pixels per line - Pscan uses the latter - which is again rather less
than the 640 pixels shown on the screen. A special 320 x 256 preview
facility is available which allows the effects of this reduced resolution
to be examined before a picture is sent. See chapter 22 for more details.
To achieve something nearer to WYSIWYG - what you see is what you get - try
the PD180, PD240 or P5 modes, which all use a resolution of 640 pixels by
496 lines (480 picture lines plus a 16-line greyscale).
12) Captions and QwikText
[Note: QwikText is covered at the end of this chapter]
Captions can be written on to a picture using any outline fonts that are
currently installed. In general, fairly bold fonts work best on SSTV,
although the more elaborate and "wispy" styles can be used if they are
transmitted in one of the high-resolution modes. If you have a large
collection of fonts you may find it convenient to copy those most suited to
SSTV into a directory called "SSTVfonts". As described in chapter 10, if a
directory name that includes the letters "SSTVfonts" is clicked in the
filer list, any fonts inside that directory will be installed.
Captions are not typed directly to the screen [although this can now be
done in a limited way with the "QwikText" system - see the end of this
chapter] but are created as an "overlay" which can then be positioned using
the mouse. This is done by clicking on the pen and ink icon (the one that
looks remarkably like the Edit icon!) just to the left of the Filer icon. A
menu entitled "Text overlay menu" will appear. To create a caption, click
on the "Create text overlay" option and a list of available fonts will be
shown. This list can run to several pages if many fonts are installed;
highlight and click on [Next font page] to display the next page of the
font list.
Highlight and click on the required font and a prompt will appear asking
for the first line of text. If the text required is just your callsign, as
will often be the case, hitting the <return> key will enter the testcard
callsign as set in the Choices window. The next prompt is for a second line
of text. If no second line is required hit the <return> key only. The next
two prompts are for the "X" point size and the "Y" point size. The X size
controls the width of the text and the Y size the height. Pressing <return>
only in response to the X size prompt results in a default size of 64
points being taken. If the Y size is to be the same as the X size, as will
often be the case, press <return> only in response to the Y size prompt.
Finally, a prompt asks whether vertical or horizontal text is required;
enter H or V as appropriate.
The text will now be plotted in white, and if horizontal text was chosen, a
"Re�size / Transform text" window will be displayed in the bottom right
corner of the screen. This allows the text to be re-sized, sheared and
rotated in a variety of ways.
The re-size options allow the x and y point sizes of the text to be
changed, and the resulting text is re-plotted on the screen as each change
is made. This is done by clicking on the left or right arrows to decrease
or increase the size of the text. Changing the x point size will
automatically change the y point size as well, as this is normally required
to maintain the correct proportions. However, the y point size can also be
varied independently, allowing tall or short captions to be created if
required.
The text can be distorted in a number of ways by clicking on the four
parallelogram icons. The shape of each icon indicates the type of
transformation that it provides. The width and height of the text can be
changed using the four arrow icons in the "Transform" area of the window,
although as this work is done in a bitmap (sprite) format, it is best not
to change the size too much. If the required transformation results in part
of the caption being lost over the edge of the screen, click with adjust
(right mouse button) on one of the four arrow icons to move it back on to
the screen.
When the transformation has been carried out, or if none is required, click
on the OK box or press <return>. The text overlay menu will be re-displayed
and the last-but-one entry will now read "Display xyz", where xyz are the
first few letters of the caption just created. To place this caption on a
picture using the current colour, outline and shadow options, click on the
"Display xyz" line in the menu and then move the caption around the screen
using the mouse. When the caption is in the required position click select,
or click adjust to abort.
A wide range of text colour, outline and shadow effects are available, each
effect having its own sub-menu. The menu entries are largely self-
explanatory and are well worth experimenting with.
Please note that the usual "anti-aliasing" process used by Risc OS to
improve the appearance of small-sized text is NOT used by Pscan. The method
of text generation deliberately prevents anti-aliasing being used, as the
effect does not travel well via SSTV, giving captions a rather soft out-of-
focus appearance.
12b) QwikText
As its name suggests, QwikText allows a caption to be added very quickly to
a picture. This can be useful if an almost instantaneous reply to a CQ call
is required. A caption can added to the received CQ picture which can then
be re-transmitted. This type of operating is really a throwback to the old
8 second black-and-white days, but it remains popular amongst some HF
operators, particularly on 20 metres.
QwikText can be activated from the Text and sprite overlays menu (the pen
and ink icon) although it is more easily accessed via its keyboard
shortcut, the Q key. Qwiktext uses a fixed font - Corpus.Bold - and a fixed
point size which gives up to 8 rows of 16 characters. Unlike the other
caption creation methods in Pscan, text is typed directly to the screen and
a flashing block cursor is provided.
When QwikText is started, the caption "DE G9ZZZ" (where G9ZZZ is the
testcard callsign from the Choices window) is placed near the bottom right
corner of the picture. The flashing cursor is then positioned at the top
left corner of the picture, ready for the callsign of the other station.
The cursor can be moved around the screen using the four cursor (arrow)
keys. Hitting return will produce the expected result and either the Delete
or backspace keys can be used to correct typing mistakes. To delete a
character in the extreme bottom right corner of the screen, move the cursor
to the extreme top-left position (the Home key can be used for this) and
then press Delete or backspace. It is also possible to simply over-type
mistakes.
QwikText uses the currently-selected text and "block" colours and these can
be selected from the "QwikText options" sub-menu which is accessed via the
Text and sprite overlays menu. The "Transparent" option allows the text to
be placed on the screen without a surrounding block. Currently, QwikText
always defaults to yellow text on a blue block background each time Pscan
is started. Future versions of Pscan may well retain the settings from one
session to another.
When the required caption has been generated, click select to exit
QwikText. To exit and remove all text, click adjust or press the Escape key.
13) Sprite overlays
The term "sprite overlays" is used in Pscan to distinguish between full-
sized sprite screens and smaller sprite files which can be loaded into
memory and then positioned on top of another picture. If a sprite file
(filetype FF9) has 32k colours and is of 640 x 480 or 640 x 512 resolution,
Pscan will load it into the current picture memory when it is clicked in
the filer list. All other sprite files will be loaded into the sprite
overlay area, the size of which is defined by an entry in Choices window.
Loading a sprite will overwrite any caption that has been created, as they
both use the same block of memory. Sprites with less than 32k colours can
be loaded and displayed in more�or-less their correct colours.
Once a sprite overlay has been loaded, it can be selected from the text and
sprite overlay menu (it will be shown as the last-but-one entry in the
menu) and positioned anywhere on the screen using the mouse. A white
rectangle is drawn around the screen to help identify the limits of the
viewable area, which is useful when plotting sprites on a black background.
If the sprite has a mask this will be used when the final plot is made,
which is done by clicking select. To abort without drawing the sprite,
click adjust.
At the moment, only the first sprite in a multi�sprite spritefile can be
accessed. An optional outline or shadow can be added to the sprite overlay
by choosing the required colour from the "Overlay outline" sub-menu.
It is also possible to "tile" the entire screen with a sprite. Once a
sprite has been loaded, the fourth-from-last entry in the "Text and sprite
overlays" menu will read "Tile 'name'", where name is the name of the
sprite. Click on this option to tile the screen with the sprite. If no
sprite is currently available, the menu option will read "{sprite loaded}"
and selecting it will have no effect.
As the tiling feature is such a useful way to generate interesting
backgrounds, Pscan will automatically tile sprites that are loaded from a
directory called "PStiles" - note the upper and lower case letters. Any 32k-
colour sprite can be used as a tile; they can be easily created using
!Paint. The standard "backdrop" tiles located inside the ADFS::HardDisc4.$.
!Boot.Resources.Configure.Textures directory can also be used. Sprites
loaded and tiled automatically (by virtue of the fact they were in a
directory called "PStiles") can still be placed "manually" on the screen
using either the "Tile" or "Display" options.
Although the version of Paint supplied with Risc OS 3.50 will not handle
more than 256 colours, a very small change in the !Run file will allow
editing of 32k colour sprites, with or without masks. A suitable !Paint
"front end" with the necessary changes already made is provided in the
Extras directory. Note that this is not a complete copy of Paint, it has
only the !Boot, !Help and !Run files. Your existing Paint application will
be called by the new !Run file. Apparently Acorn did not consider this
version of Paint to be stable enough for official release, although it
appears to work very well. Some features are not supported, such as
flipping 32k colour sprites with a mask, although flipping is possible if
the mask is temporarily turned off. To paint or fill an area using the mask
"colour", click on the NONE icon on the colour selector.
Note: The version of !Paint supplied with Risc OS 3.60 and 3.70 fully
supports 32k�colour sprites without any modification, including the
flipping facility that is missing from the OS 3.50 version.
The "Grab screen rectangle" option allows a sprite to be "grabbed" from the
screen. This can then be placed on top of another picture or used to
produce a tiled background. To copy large areas from one picture to another
the "Grab screen area" option may be more suitable. See chapter 25 for more
details.
To grab an area from the picture currently displayed, click on the "Grab
screen rectangle" option and then move the mouse pointer to one corner of
the area required. Click select and then drag the rubber band box to
enclose the area to be grabbed. Click select again and the process is
complete. An error message may be given if there is insufficient memory in
the sprite overlay area to accommodate the sprite. See chapter 14 - The
Choices window - if you need to increase the amount of RAM allocated to
sprite overlays.
The grabbed sprite can be positioned and plotted to the screen by choosing
the "Display 'rectangle'" option in the text overlay menu. Move the sprite
to the required position and click select, or click adjust to abort. To
create a tiled background using the grabbed sprite, click on the "Tile
'rectangle'" option.
Also included in the text overlay menu is an option called "Grab screen
ellipse". This allows a circular or oval-shaped masked sprite to be created
which can then be placed on top of any picture or background in any of the
picture memories. When the Grab screen ellipse option is selected, a
circular cursor will appear which can be moved around the screen using the
mouse. The height and width of the cursor can be varied independently,
allowing a wide range of round shapes to be "cut out" of the picture.
The shape is varied using a combination of two keys and two mouse buttons;
the left CTRL key, the left ALT key, the middle mouse button (menu) and the
right mouse button (adjust). The various key/mouse button combinations have
the following effects:-
Adjust only : Increase both width and height
Menu only : Decrease both width and height
CTRL + adjust : Increase width
CTRL + menu : Decrease width
ALT + adjust : Increase height
ALT + menu : Decrease height
The first two controls - adjust or menu with no keys pressed - retain the
original circular shape of the cursor. The maximum size that can be
obtained is automatically limited by the Overlay setting in the Choices
window. A circle with a diameter equal to the height of the screen display
will require approximately 558k of memory. When the desired size and
position have been chosen, click select. To abort before grabbing an area,
press Escape.
The grabbed elliptical sprite can be positioned and plotted to the screen
by choosing the "Display 'ellipse'" option in the text overlay menu. As
with other sprite plotting, clicking menu will speed up the positioning
process by temporarily removing the sprite mask. Click adjust to abort or
select to plot the sprite to the screen. A border can be chosen - before
using the Display 'ellipse' option - using the Overlay outline sub-menu. As
circular or elliptical sprites seem to look best with a border, a yellow
border will be used by default. Choose a different colour or click on the
"No outline" option as required.
14) The Choices window
A number of user-defined choices / configuration options can be set in the
Choices window, which is accessed via the Choices... entry in the Pscan
icon bar menu. The window uses a "pane" format, so use the vertical scroll
bar to view the lower half of the window.
The window is divided into a number of sections as follows:-
Identification:
The "Testcard callsign" is used as a default callsign in a number of
program areas, including (obviously) the testcard. Note that changing this
callsign will not change the "ID" callsign that is printed in the top-left
corner of the screen when transmitting.
The "Header text" is optional, but if used the text entered will be
positioned in the greyscale area of a TX picture. A short message similar
to "Paul in Essex" would be appropriate. Header text is limited to 28
characters.
The "Repeater CW ID" text will transmitted in morse code in response to a
valid access when the Pscan repeater mode is active. See chapter 33 for
more details on repeater mode.
General:
The clock frequency entry must correspond to the clock frequency of your
computer to prevent sloping pictures. This can be easily found
experimentally and the process is described in detail in chapter 8.
The "74HC74 TX divider" option should be ticked if the PscanIF2 interface
circuit is being used. If a "standard" HamComm-style interface is used,
leave the icon un-ticked.
The "Thumbnails" icon should be ticked if the optional thumbnail feature is
required. One possible reason for NOT wanting thumbnails would be shortage
of memory (thumbnails require an extra 325k of RAM) but with memory now so
cheap this is unlikely to be an issue.
The "1750 Hz tone detector bandwidth" is for repeater use only. The default
value of 40 Hz (implemented as plus-and-minus 20 Hz) seems to work well.
See chapter 33 for more repeater info.
The "Memories" option sets the number of picture memories available and
must be in the range 2 to 8. Each picture memory requires 640K of computer
memory, so at least 8MB of RAM must be fitted for the maximum of 8 picture
memories to be used, although this will leave very little memory for other
applications. On an 8MB machine, 4 or 5 picture memories would be a more
sensible choice.
The "Overlay" option sets the amount of RAM to be used for text caption and
sprite "overlays". The minimum size that can be set is 60k, although around
200k is more useful. There is no maximum size and on machines with plenty
of RAM available a setting of around 800k will allow very large overlays to
be loaded or created.
Pathnames:
The "Start directory" is simply the directory that will be displayed by
default in the Pscan filer display. Any valid pathname can be entered.
The "User path" has been largely superseded by the "user defined pathnames"
options now available in the Pscan filer display, as described in the
appendix to chapter 10. Any pathname not normally available in Pscan can be
entered here, such as SCSI::Drive5.$.PICS to allow a SCSI drive to be
accessed or perhaps CDFS::0.$ if you have a CD-ROM drive. To access this
"user defined" pathname, click on the UD button on the filer display screen.
The "Auto-save" entry is used to set the pathname for the auto-save
feature, described in chapter 6. Any valid pathname on any drive may be
specified.
Serial port:
Two "radio button" icons allow selection of either the standard built-in
Risc PC serial port or an Atomwide serial port expansion card ("podule").
If the Atomwide button is clicked, further options become available,
requiring the podule slot number of the Atomwide card to be selected. This
can be found by using the *Podules command. It is also necessary to click
an icon corresponding to the serial port on the Atomwide card which is to
be used with Pscan. The options are simply the left, middle or right port
as viewed from the rear of the computer.
Notes
Pscan automatically claims the amount of memory required based on the
number of picture memories chosen (by the user), the overlay size and the
thumbnails setting. If an error message similar to "4500K free memory is
needed before the application will start" is displayed when trying to start
Pscan, you may have to reduce the number of picture memories or the size of
the overlay area.
Most changes made in the Choices (configuration) window will come into
effect immediately, except changes to the number of picture memories, the
overlay size and the thumbnails option. These three parameters affect the
amount of RAM required by Pscan, and this can only determined during the
initial start-up when the Pscan icon is first installed on the icon bar.
Therefore any changes to these parameters will only come into effect the
next time Pscan is started "from cold", and a message to that effect will
be shown when the Save option in the Choices window is clicked.
15) Hamcolor FAX modes - general info
These modes were introduced by DK8JV in the well-known JVFAX program on the
PC. The most common resolution for pictures sent in these modes is 640 x
480, although JVFAX will allow pictures with many more lines to be sent as
well. A "header" comprising a greyscale and a date/time stamp is usually
sent at the start of the frame. Pscan implements Hamcolor FAX modes at a
fixed resolution of 640 x 512, allowing both the header and a 640 x 480
picture to fit on the screen without the need for scrolling.
The most common speed/mode is 360 lines-per-minute with an IOC (index of
cooperation) of 204. This mode takes about 4 minutes to send a 640 x 480
picture and offers a considerable increase in picture resolution compared
to the standard colour SSTV modes (Martin, Scottie etc). However, even
better quality can achieved by using the 240 lines-per-minute mode,
although the transmission time for a 640 x 480 picture is increased to
about 6 minutes. The faster 480 lines-per-minute mode tries to send the
picture rather faster than is theoretically possible, but it may be worth
experimenting with. If working JVFAX stations, they can use the mode editor
in their software to implement Hamcolor FAX at 480 and 240 LPM, as well as
the standard speed of 360 LPM. All other parameters (IOC, start-tone,
number of phasing lines etc) can be entered exactly as they are specified
in the 360 LPM set-up. The slower 240 LPM mode is particularly effective
for local "hi-fi" work on 2 metres FM.
The Hamcolor modes do not support the VIS system used by most of the SSTV
modes, so automatic selection of the correct mode is not possible. It is
therefore essential that the correct mode is set (using the mode select
menu) before attempting to receive a picture. A standard FAX start-up
sequence is transmitted in the Hamcolor modes, consisting of a start tone
followed by a "phasing signal". This regular "tick-tick-tick" sound serves
the same purpose as the line sync pulses used on SSTV, marking the position
of the start of each line. However, unlike SSTV line sync pulses, the
phasing signal is transmitted before the picture is sent; there are no line
sync pulses on the picture itself. If the phasing signal is missed there is
no way that Pscan can determine the correct position of the picture, and
manual positioning using the mouse is then necessary. This is described
later.
Once one of the three Hamcolor modes is selected, the label on the VIS
button on the tool bar changes to "Phase", indicating that a phasing signal
will be used to start picture reception. When in "Phase" mode, the VIS
detector is disabled and Pscan will NOT respond to a VIS signal. Select one
of the SSTV modes to return the VIS detector to normal SSTV operation.
At the time of writing (December 1996) the use of Hamcolor FAX seems to be
on the decline, no doubt at least partly due to the availability of the
excellent PD and P higher-resolution SSTV modes.
16) Receiving Hamcolor FAX
Select the required mode from the SSTV mode select menu. The most common
mode is 360 lines-per-minute (usually configured as "mode 4" in the JVFAX
program) and this can be assumed if no speed is mentioned. When the
Hamcolor transmission is imminent, click on the phase button on the tool
bar. Once the phasing signal is detected, the green indicator on the phase
button will turn red and picture reception will commence. The first picture
information displayed will consist of any remaining phasing lines, which
will be displayed as mostly black lines with a thin white border down each
side of the screen.
Depending on the number of phasing lines sent, it is quite possible that
even a completely correct phasing signal start-up will result in the wrong
colour sequence being used by Pscan. Most Hamcolor FAX transmissions
include a header which includes red, green and blue boxes, labelled R, G
and B. If the colours of the boxes do not match the labels, the colour
sequence is wrong. However this is NOT a problem and nothing needs to be
done at this stage. As long as the positioning of the picture is correct,
the colour sequence can be easily changed once reception has finished. To
do this, click on the RGB processing button on the tool bar (the icon
showing red, green and blue filled circles) and then click on the
"Rotate�R�G-B sequence" option. This will "rotate" the red information into
the green, the green into the blue and the blue into the red. If the
colours displayed are still not correct, click on the Rotate R-G-B option
again.
If the phasing signal is missed or absent, a manual start is necessary. To
do this, first click on the phase button on the tool bar to cancel the
phasing signal start-up (if it has been selected) and then click on the R
button. Picture reception will start immediately, but the positioning will
most likely be wrong. To correct the positioning, it is first necessary to
determine by eye where the edge of the image should be. This should be
fairly easy to do once a few lines have been received, as most Hamcolor
transmissions include an extra area of white at the start of each line,
which will appear as a vertical white stripe gradually writing down the
screen. If a white stripe is not visible, it should still be obvious where
the edge of the frame should be, as the colours in the picture will change
noticeably at this point.
Assuming that a white stripe is visible, move the mouse pointer over the
middle of the stripe and click on the menu (middle) mouse button. If a
white stripe is not visible, move the mouse pointer to where the left edge
of the image appears to be and click menu. Note that the mouse pointer's
"Y" position (up and down) is not important; it is only the "X" position
(left and right) that is of interest. Once menu has been clicked, the
position of the image will be adjusted and subsequent lines will be
received in the correct place. [Note that the lines already received will
not be moved]. The colour sequence may still be wrong, but as mentioned
above, this can be easily corrected after reception of the picture is
complete.
Please note that when in manual start mode, received picture quality will
initially be rather poor. However, this will return to normal once the menu
mouse button has been clicked to reposition the picture. Pscan normally
disables all interrupts whilst receiving pictures, which freezes the mouse
pointer. As the mouse has to be used to position the picture, the
interrupts are left on when a manual start is used in Hamcolor FAX modes.
This tends to degrade the received image, and may even cause the picture to
step slightly to the left as the scan progresses, particularly when using
"only" an ARM-610 processor. However, once the menu mouse button is
clicked, the interrupts are turned off and subsequent lines will be
received normally.
If the picture position is still not correct after clicking menu, hold down
adjust for a second or so. This will un-freeze the mouse pointer and menu
can be used again to reposition the picture.
When receiving in Hamcolor mode, Pscan will begin scrolling the image
upwards when the scan reaches the bottom of the screen. If this was not
done it is possible that a few lines at the bottom of the transmitted image
would be lost. The amount of scrolling is preset to 38 lines, which is
roughly the height of the Hamcolor "header" plus a few phasing lines. It is
obviously preferable to lose the phasing lines and the header - they will
gradually be shifted off the top of the screen - rather than part of the
actual picture. However, some pictures will not need the extra few lines
provided by scrolling, and it is possible to terminate reception early by
holding down select.
17) Transmitting Hamcolor FAX
Choose the required speed/mode from the SSTV mode select menu and then
click on the T button on the tool bar. A standard start-tone and phasing
signal will be sent, allowing automatic reception by stations running
JVFAX, Pscan or any other SSTV/FAX program that correctly implements the
Hamcolor FAX modes. Once the start-tone and phasing signal have been sent
(about 8 seconds in 360 LPM mode) the TX cursor will appear indicating the
progress of the transmission.
A stop-tone is sent at the end of the frame and this is also sent if the
transmission is aborted early, by clicking select. The TX cursor disappears
during the stop-tone; the tool bar will reappear when the stop-tone has
finished.
As an alternative to the usual greyscale, a "Hamcolor header" is available
in the test patterns menu, invoked by clicking on the greyscale and colour
bar icon on the tool bar. This header includes RGB boxes and a greyscale,
as well as the date and time and an Acorn logo.
Although Pscan allows colour FAX transmissions at all speeds from 60 to
480�LPM, the phasing signal will not be sent correctly at 60 or 90 LPM,
although the actual picture transmission will be normal. However, as the
frame time at these speeds is around 20 minutes, you will probably never
need to use them. Even at 120 LPM the frame time is about 13 minutes, and
it is unlikely that any benefit in picture quality will be obtained at
slower speeds.
18) The PD SSTV modes
The PD modes were developed jointly by Don Rotier, K0HEO (the author of the
PC Windows�based "WinPix Pro" program) and Paul Turner, G4IJE. These modes
use a more complex method of colour encoding/decoding than the standard
Martin and Scottie modes and this allows higher resolution pictures to be
transmitted in a reasonable time. If the Martin 1 mode was expanded to give
a resolution of 640 x 480, the transmission time would be around 7 minutes.
Using the PD modes a good-quality 640 x 480 image can be sent in just 3
minutes, or even less if some loss of sharpness can be tolerated.
The colour encoding method used by the PD modes is similar to that used in
the old Robot 36 and Robot 72 modes. However, the usual problem associated
with those modes - colour changes if the signal is wrongly tuned on SSB -
has been eliminated by using an automatic tuning technique. This ensures
perfect colour reproduction even with a tuning error of plus-or-minus 150
Hz.
There are five PD modes altogether, identified by the letters "PD" followed
by the approximate frame time in seconds. All modes have a compulsory 16
line greyscale header which is included in the following information:-
Mode name Resolution Frame time Remarks
PD 50 320 X 256 50 seconds Slightly softer than M1 or PD90
PD 90 320 X 256 90 seconds A possible alternative to Martin 1
PD 160 512 x 400 160 seconds An odd size, but can be useful
PD 120 640 x 496 126 seconds Slightly softer than PD180
PD 180 640 x 496 187 seconds Intended to be the standard 640x496 mode
PD 240 640 x 496 248 seconds The ultimate for VHF (or HF) work
The latter three modes all give a very worthwhile increase in genuine
picture resolution, unlike modes such as Martin's HQ modes which give
sharper pictures than Martin 1 but still at only 256 x 256 resolution.
Don and I hope that other SSTV software writers will include the PD modes
in their systems. A detailed specification for the modes is available on
request from me, along with technical details of the colour
encoding/decoding method.
The full PD specification can also be found on Don's web page, located at:-
http://www.skypoint.com/~k0heo
It can also now be found on my website, located at:-
http://members.aol.com/pscansstv/
19) PD modes in Pscan
The PD modes are used much like any other SSTV mode. They all include a VIS
code so automatic mode selection is possible. A manual start can also be
made and the usual "re-sync" facility (the adjust mouse button) is
available.
The auto-tuning facility, which prevents tuning error from causing colour
changes on SSB, can be switched off if required. This can be useful when
working with noisy FM signals on two metres, as the noise can occasionally
cause the auto-tune to apply an erroneous correction. A "PD auto-tune
control" sub-menu is provided on the mode menu which allows the auto-tune
to be turned off. On SSB it is best to leave the auto-tune on at all times.
The auto-tune works by measuring the frequency of the last 4 or 8 line sync
pulses and using the average value to apply a correction to all the colour
decoding processes. This works very well but obviously there is a delay
between a frequency change and the appropriate correction being applied.
Because of this, it is best to leave a small tuning error uncorrected,
rather than making lots of tiny VFO or RIT adjustments whilst watching the
tuning indicator. As long as the tuning indicator shows that the signal is
within plus-or-minus 150 Hz of the nominal frequency, the auto-tune will
ensure that the picture is received correctly and precise tuning will serve
no useful purpose.
As the auto-tune feature relies on sampling the line sync pulses, it is
important not to use such a narrow passband that they become attenuated. If
you normally use IF shift or passband-tuning to restrict LF audio
response - quite likely on HF SSB - you may need to use slightly less than
normal to ensure that the PD mode sync pulses can be sampled by the auto-
tune software.
It is also important not to tolerate a "bad start", as this may confuse the
auto-tune feature. A bad start will be easy to spot in the PD modes, as a
very obvious "comb" effect will be seen down the left or right edges of the
picture. A small amount of the comb effect is normal - say up to 3 or 4
pixels wide - but any more than this may indicate that the picture is
incorrectly positioned. The cure - as with bad starts in all other SSTV
modes - is simply to hold down adjust (the right mouse button) for a second
or so and then release it. This causes a re-sync and the picture
positioning should improve. Fortunately, the long line sync pulses used in
the 1997-spec PD modes should make bad starts fairly rare.
The PD120, 180 and 240 modes use 496 picture lines, leaving 16 lines at the
top of the Pscan display unused. When receiving in these two modes, the top
16 lines will be filled in with dark grey and the received image will then
occupy the rest of the screen. When sending in PD120, 180 or 240 the top 16
lines will again be filled with dark grey (which is not transmitted) and a
greyscale header, including your callsign and the name of the mode being
sent, will occupy the next 16 lines. This leaves 480 lines of the picture
visible on the screen and all of this area is transmitted.
PD160 uses a picture size of 512 x 400 (including the 16 line header) which
is obviously somewhat smaller than the 640 x 512 Pscan display. When
receiving in this mode, the picture will be positioned approximately in the
centre of the screen, leaving a border of grey on all sides. To send a
picture in PD160, any 512 x 384 area of the screen can be chosen using a
rectangular cursor. The cursor is activated when the T button is clicked
and PD160 mode has been chosen from the mode select menu. Move the cursor
to the desired position and click select. The PD160 mode transmission will
begin immediately. To abort without transmitting the picture, click menu or
adjust.
Pictures received in PD90 or PD50 modes (320 x 256) can be saved in the
special Pscan format if required. Pictures received in any other PD mode
should be saved as either 640 x 512 sprites or in 640 x 512 JPEG format.
When saving pictures received in PD160 mode the grey border will be saved
as well.
20) The Pasokon P modes
Version 3 of the PC-based Pasokon program (written by John Langner, WB2OSZ)
has introduced 3 more "high resolution" SSTV modes. These use a
conventional line�sequential colour format, rather like Martin 1 or SC2-
180. The 3 minute mode - called simply P3 - tries to send the pixels a
little too fast and tends to soften pictures slightly. However, the 5 and 7
minute modes, called P5 and P7, give results very similar to the PD-180 and
PD-240 modes respectively.
All three P modes send a 16 line greyscale header followed by 480 picture
lines, just like PD-180 and PD-240. These modes are also available in the
WinPix Pro program and the cut-down Pasokon systems, called "Pasokon Lite"
and "EZ-SSTV". At the time of writing (January 1997) none of the other
popular SSTV programs (JVFAX, GSH, MSCAN, PROSKAN etc) support these modes.
21) Test patterns
The test patterns menu is accessed by clicking on the greyscale/colour bar
icon next to the "T" icon. The options available include greyscales, colour
bars, a chequer board and a test card. Simply highlight and click on the
required test pattern and it will be quickly drawn into the currently
selected picture memory. Three types of "top" greyscale are available; it
is standard practice to include a few lines of greyscale at the top of the
frame when transmitting in all modern SSTV modes. The "Top greyscale - type
2" is recommended, as it includes RGB colour boxes which allow a receiving
station to very quickly determine whether or not they are receiving in
colour. Lack of colour is a common problem for new JVFAX users.
The "Header text on/off" option determines whether or not a line of text is
placed in the greyscale area at the top of the picture when transmitting in
any SSTV mode (not FAX). The text must be defined in the Choices window and
should be no more than 28 characters long. If no text has been defined, or
the word NONE has been entered, no header text will be added. Any text can
be used; many PC-based SSTV programs display the operator's name and the
software version number, so something like "Fred in Essex - Pscan 3.00"
would follow that trend nicely.
The "Hamcolor header" option produces a header similar to that generated by
JVFAX. It's use when sending in Hamcolor FAX modes is strongly recommended.
The final two options in the test patterns menu produce a star field
background and a copy of the Pscan opening screen, which can be sent via
SSTV or FAX if required.
22) RGB processing and miscellaneous
The "RGB processing & misc." menu is invoked by clicking on the RGB icon
(the red, green and blue circles) on the tool bar. It includes several
options related to viewing and processing the RGB components of an image
plus a number of miscellaneous features.
The "Rotate R-G-B sequence" option is mainly used to correct the colour
sequence of Hamcolor FAX pictures, but it can also be useful for special
effects, particularly when used with some of the Pscan background options -
described later.
The "Show RED/GREEN/BLUE separation" options allow the three colour
components of a picture to be viewed and analysed. The colour separations
are displayed in shades of grey, which makes it easy to compare them for
signs of patterning, an elevated black level or other defects. Having
chosen one of these options, click the left mouse button to restore the
original full-colour image.
The "Invert RED/GREEN/BLUE" options are used for special effects. They turn
the colour scale "upside down" - dark becomes light and light becomes dark.
Again some nice effects can be produced when used on the various background
options.
The "Picture processing" option allows the red, green and blue components
of a picture to be cut or boosted. To cut the level of (say) red, click
select on the arrow to the left of the red rectangle. Each click cuts the
level by 5% and the amount of cut will be shown in the rectangle. To boost
the red, click on the arrow to the right of the rectangle. When the desired
amount of cut or boost has been made to one or more of the colours, click
on the "Try" box to see the effect that this will have on the picture.
Click on "OK" to make the processing permanent or click on "Reset" to try
again. To return the picture to it's original condition, click on "Reset"
then "OK".
A simple 2:1 scaling option is available which allows any quarter-sized
area of the picture to be scaled. Move the cursor until it surrounds the
desired area and then click select. To abort without scaling, click adjust.
After scaling, a dialogue box with "Reset" and "OK" options will be
displayed. Click select as required.
Similarly, the entire picture can be scaled by a factor of 1:2, which
reduces the area of the image to one quarter of its original size. As with
the 2:1 scaling option, a Reset/OK dialogue box is displayed, allowing the
size reduction to be undone if required. If OK is clicked the quarter-size
image will remain plotted in the centre of the screen and it will also be
"grabbed", so that a copy of it can be placed in any required position in
any picture memory. See chapter 25 - Grab screen area - for more
information on grabbing and plotting screen areas.
The "Preview 320 x 256" option displays the picture in the currently
selected memory at reduced resolution. This provides a preview of how the
picture will look when it is transmitted in one of the standard SSTV modes,
such as Martin 1 or SC2-180. When transmitting SSTV (except in the PD and P
modes), Pscan reduces the number of pixels per line from 640 to 320 by
averaging adjacent pixels. Sending an averaged values seems to give better
results than just ignoring the excess pixels, which is what some other SSTV
programs do. The number of lines is also reduced from 512 to 256 by sending
only every other line. The 320 x 256 preview mimics these effects exactly,
allowing the impact of the reduced SSTV resolution to be examined carefully
before sending a picture. Please note that the Hamcolor FAX modes, the PD
modes and the P modes use the full 640 x 512 resolution (more-or-less), so
this facility is not required when using any of these modes.
Next on this menu is the "Tile perspective effect" option. As its name
suggests,this produces a kind of "perspective" effect, giving the
impression that the picture has been placed on a coloured slab and then
tilted backwards. Several slab colours can be selected from a sub-menu. The
picture in the currently selected picture memory is used as the "subject"
of the perspective effect, and the picture in the next picture memory is
used as a background. For example, put a 32-step greyscale in memory number
2 and then load a picture of (say) a tiger into memory number 1. Click on
the "Tile perspective effect" option and choose a purple tile colour. The
tiger is drawn in perspective on the purple tile, the tile in turn is drawn
on the greyscale background. If no higher picture memory is available,
memory number 1 is used to provide the background. As expected, the
finished tile-perspective effect is drawn into the currently selected
picture memory.
The "Rotate / flip" sub-menu offers five processes that act upon the entire
image in the currently selected picture memory. The picture can be rotated
left or right by 90 degrees, rotated 180 degrees, and flipped top-to-bottom
or left-to-right. As the screen is wider than it is tall, a small strip
down each side of the screen is lost when the image is rotated left or
right by 90 degrees.
Next is the "Fade top-to-bottom" option. This was added to complement some
of the background effects but it may find other uses as well. It fades the
brightness of the picture from the top of the screen to the bottom, such
that the bottom of the picture is approximately half its original
brightness.
The "Show pixel RGB values" displays the RGB values of the pixel at the
mouse pointer position. Values in the range 0 to 31 are displayed on a
small panel, positioned by default near the bottom of the screen. If the
panel obscures an area of interest, click select and the panel will move to
the top of the screen. Click adjust to quit.
The last option in the RGB processing menu is the "Waveform monitor". This
produces a very passable imitation of a proper oscilloscope-based waveform
monitor, as used in broadcast television and by some ATV operators. The
red, green and blue information is displayed in "parade" format with black
level at the bottom of each window and peak level at the top. This display
allows quick analysis of picture brightness and black level to be made. A
graticule will be drawn on the waveform display with each horizontal line
representing a 10% change in video level. The "Upload" button causes the
waveform monitor display to be added permanently to the the bottom of the
picture, allowing it to be transmitted via SSTV or FAX. Click on "Cancel"
to quit the waveform monitor and restore the picture. A bank of picture
memory select buttons is also provided, allowing a comparison to be made
between the contents of two or more picture memories, although the "redraw"
time is a little long on anything less than a StrongARM processor.
23) Tools and utilities
This menu is accessed by clicking on the paintbrush-and-spanner icon on the
tool bar. The first option - Repair one line QRM - provides an effective
means by which picture lines spoiled by QRM or QSB can be repaired. It
works best when an affected line has a good line above or below it, which
fortunately is often the case.
When the "Repair one line QRM" option is clicked, the standard mouse
pointer is replaced by a "cross hairs" pointer. Position this carefully on
the line that needs to be repaired, just to the left of the spoiled area.
Click select and then move the rubber-band line to the right end of the bad
area. When select is clicked again, the bad line will be repaired using
picture data from an adjacent line. The up and down position of the cross
hairs determines whether the line above or below the bad one is used to
provide the source material for the repair process. As many lines as
required can be repaired in one go. Click adjust to quit.
The "Flood fill" option provides a very basic flood fill facility. The
colour to be used can either be picked up from the screen by clicking
adjust or chosen from a colour selector invoked by clicking menu. The flood
fill is initiated by clicking select with the mouse pointer over the
required area. To quit the flood fill option, either move the mouse pointer
to the extreme bottom edge of the screen and click select or press the
escape key.
The "Paintbrush" option uses the same two methods of selecting the paint
colour as the flood fill option. The colour selector also allows a number
of brush sizes to be chosen. Click on OK when the required colour and brush
size have been selected. To undo any painting done in the current session,
press the escape key. To quit, leaving any painting intact, move the mouse
pointer to the extreme bottom edge of the screen and click select.
The "Paint with sprite" facility allows the currently loaded/created sprite
overlay to be used as a "brush". Any sprite can be used in this way. As
might be expected, hold down select to paint to the screen and click adjust
to quit. If no sprite is currently available, an error message will be
displayed.
The next option in the tools & utils menu is the "Cloning brush". This
feature will be familiar to anyone who has used a photo-retouching package,
although the implementation in Pscan is rather basic. The principle of the
cloning brush is that an area of picture can be "cloned" or copied to
another part of the screen using the mouse. In Pscan, the "source" area is
indicated by a rectangular outline cursor and the "target" area is dictated
by the mouse pointer position. Having selected the cloning brush option,
click select over the required source area and then move the mouse pointer
to the target area. Hold down select and move the mouse to paint to the
screen. The brush size can be changed by clicking the menu mouse button to
cycle through the six preset sizes available. Click adjust to quit.
The two gradated border options produce borders in three widths and a wide
range of colours which are chosen from a sub-menu. The "480" option leaves
room at the top of the screen for a greyscale; the "full" option uses the
full screen area. The border sub-menu is split into two halves by a line of
dashes. To create a border, first click on the required width and "gradate
to" options in the lower half of the menu - the options currently chosen
are indicated by ticks next to the menu entry. Now click on the required
start colour (or the colour selector option) in the top half of the menu
and the border will be quickly created.
The two "pipe" border options produce a border of fixed width which has the
appearance of a shiny pipe surrounding the picture. Choose the "480" or
"full" options (described in the previous paragraph) as required.
The "TX test tones" option displays a sub-menu of 16 audio tones that can
be generated for test purposes. Tones from 1000 Hz to 2400 Hz can be
generated in steps of 100 Hz. One extra tone is provided; 1750 Hz which may
be useful for repeater access. Whilst a tone is being sent the PTT line
will be keyed and the mouse pointer frozen. Click on select to cancel the
tone and release the PTT line.
The next option in the tools & utils menu - auto-save mode - has already
been described in chapter 8.
The "TX tones x4 mode" menu entry will not normally be needed, as this
option is set in the Choices window to indicate that the 74HC74 TX tone
divider circuit is in use. However it is possible to temporarily override
the Choices setting if required.
The next option in the tools & utils menu can be used to disable the check
that is made when attempting to save a picture in the Pscan 320 x 256
format. Pscan will normally prevent a picture that has NOT been received in
a standard SSTV mode from being saved in the special Pscan format. Tick the
"Bypass Pscan save check" if you want to override this for some reason.
The next option in the menu displays this manual. The manual can also be
read by pressing H (for "help") when the Pscan tool bar is displayed or by
choosing the Manual option from the icon bar menu.
24) Backgrounds
The next icon on the tool bar (the paint roller) activates the background
options menu. A wide range of gradated background options are available
plus a plain background that uses the same colour selector as the
paintbrush and flood fill features described above. Most of the menu
entries are self-explanatory; try them all to find the effects you like
best.
It is worth noting that the range of background colours available can be
further increased by inverting one or more of the colour separations and/or
using the rotate colour sequence option, both of which are provided in the
RGB processing menu. In particular, each of the "Multi diagonal"
backgrounds can actually generate 24 different colour effects - 3 possible
colour sequences and 8 possible colour inversions.
The "Fade top-to-bottom" option can add extra impact to a background. The
bottom of the frame is darkened the most but this can be reversed by
flipping the entire image from top to bottom using the "Rotate or flip"
options in the RGB processing menu.
The last option in the backgrounds menu allows the chosen background to be
merged with the picture in the currently selected memory. The merge effect
is turned on (or off) by clicking on it before choosing the required
background option. A tick indicates that the merge is "on". Some very nice
effects can be produced by merging the various coloured backgrounds with a
"tiled sprite" background, although they can be merged with any type of
picture. Tiled sprites were described in chapter 13.
As an example of what the "merge" effect can produce, try the following:-
Ensure the "Merge with picture" option is NOT ticked. Go to the "Double
gradations" sub-menu and click on the "Yellow-Black" option. Now tick the
merge option and go to the "Miscellaneous" sub-menu. Finally, click on the
"Diagonal" option.
There are many hundreds of combinations like this. Some very colourful text
can be produced by combining a merged background with a "masked text
sprite", as described in chapter 31.
25) Grab screen area
This menu is activated by clicking on the camera icon on the tool bar. This
feature allows an area of a picture to be "grabbed" and then copied on to
another picture in another memory. Some very impressive effects can be
created by copying an area about 3/4 the size of the screen and then
dropping it onto one of the many backgrounds described above.
The grab screen area feature works by simply copying data from one picture
memory to another. It does not use the text/sprite overlay memory area, and
therefore captions created (or sprites that have been loaded) will not be
disrupted when using this feature. This also means that there is no size
limit to the area that can be "grabbed".
To grab an area from the picture currently displayed, click on the "Grab
screen area" option and then move the mouse pointer to one corner of the
area required. Click select and then drag the rubber band box to enclose
the area to be grabbed. Click select again and the process is complete.
To plot the copied area back to the screen, select the required picture
memory and then click on the "Plot area - normal" option in the grab screen
menu. A rectangular cursor will appear on the screen, the size of the
cursor matching the size of the grabbed area. Move the cursor to the
desired position and click select. The grabbed area will be plotted quickly
to the screen.
As it's name suggests, the "Plot area - flipped" option works in the same
way as the "normal" option, except that the grabbed area is flipped left-to-
right.
Two border options are available when plotting grabbed areas. The first
produces a kind of "plinth" effect, complete with a very effective
highlight on the top and left sides. A range of standard colours are
provided or the colour selector can be used. The second border option
produces a wider range of colour gradations, and some of the colour options
provided give the impression of a shiny metallic frame. Some of the more
complex colour blends cannot be described adequately in the few words
available in a menu entry, so are simply labelled "Multi-colour 1", "Multi-
colour 2" etc.
The shadow option gives an impression of depth when the grabbed area is
plotted to the screen. It can be used in conjunction with both border types.
The "Grab entire screen" option can be used in conjunction with the "Plot
entire screen" option to copy a complete picture from one picture memory to
another. In this case, no cursor positioning is required.
The "Quad display" option provides a very effective means of generating
"quad mode" pictures, where four pictures are reduced in size and combined
to make one new picture. Each original picture occupies approximately a
quarter of the screen area with a space at the top of the frame for a
greyscale. The quad display picture can be transmitted or saved, as
required.
To generate a quad display, click on the "Quad display" option in the grab
screen menu. Miniature versions of the pictures currently in memory will be
displayed, each surrounded by a yellow border. A quarter-sized version of
the picture in the currently selected memory will will be shown near the
middle of the screen. This will be divided into four by red lines which
represent the four "quadrants" that the miniature pictures can be placed
into.
Any of the pictures with a yellow border can be now be dragged into the
required position inside the red rectangles. To do this, click and hold
select over the required picture, move the mouse pointer inside one of the
red rectangles and then release select. The mouse pointer positioning is
very non-critical; as long as the pointer is somewhere inside the required
"source" and "destination" rectangles all will be well. You can repeatedly
"drag and drop" pictures until you are happy with the result. Click on "OK"
to create the final quad display or click on "CANCEL" to abort. The quad
display will be created in the currently selected picture memory.
A border can added to the final quad display by choosing the "Quad border"
option in the Grab screen menu. Three widths are available, narrow, medium
or wide. Use the colour selector to choose the quad border colour. Once the
colour selector has been invoked there is no longer a "cancel" option, but
you can of course press Escape if you want to abort without drawing the
quad border.
26) Miscellaneous
The currently displayed picture can be scrolled in any direction if
required. Move the mouse pointer to somewhere near the middle of the screen
and then click select to remove the tool bar. Now move the pointer to one
edge of the screen and click (or hold down) select. The entire picture will
slowly scroll in that direction. The picture can be scrolled up, down, left
or right, depending on where the pointer is positioned. Move the mouse
pointer back to the middle of the screen and click select to abort the
scrolling operation and restore the tool bar.
Note that parts of the picture scrolled off the screen cannot be recovered.
If the scrolling feature is activated by mistake, press Escape to restore
the picture to its original condition.
It is possible to activate a screen-save facility to capture Pscan screen
displays, including the thumbnails and the filer display. The saved screen
can then be loaded and transmitted via SSTV or FAX if required. The main
purpose of this is to show non-Pscan users what the various screens look
like. Most PC users will not have heard of the Acorn Risc PC let alone
Pscan, so a picture or two might help to educate them!
There are four occasions during which the screen-save feature can be used:-
1) When the main tool-bar is displayed but no RX, TX or VIS operations
are in progress.
2) Any time that a menu or sub-menu is displayed.
3) When the thumbnail screen is displayed.
4) When the filer display is shown but no save, delete or info boxes have
been activated.
To initiate a screen-save, press the ALT and S keys together (ALT+S). It
doesn't matter which ALT key is used or whether the caps lock is on or off.
The screen will be saved into the default Pscan directory (as defined in
the Choices window) and will have a filename of PSscreen1. The next screen
saved will have a filename of PSscreen2 and so on. Obviously the screen
files can be renamed or deleted (using the normal Risc OS filing operations
on the desktop) as required.
27) Adding more picture memories
As described earlier, the number of picture memories available is normally
determined by the "Memories" setting in the Choices window. However it is
possible to temporarily add one or more picture memories provided that less
than eight are currently configured and that enough free memory is
available. To do this, hold down the ALT key and click select on the first
blank memory select button. If enough free RAM is available the previously
blank button will now show its correct number and it will be available for
instant use. Any number of blank buttons can be activated in this way. They
must always be activated in sequence - from left to right along the tool
bar. The usual error message will be "No room for this DIM" if insufficient
free RAM is available for the additional picture memories.
The extra memories will remain in use until Pscan is quit. When it is
subsequently re-started the number of picture memories will revert to the
configured value, as shown in the Choices window.
With 8 MB of RAM fitted to the computer, it is just possible to use the
full quota of eight picture memories, but to configure this in the Choices
window results in around 6 MB of RAM (depending also on the "overlay" size)
being claimed when Pscan is installed on the icon bar. It makes more sense
(with "only" 8 MB of RAM fitted) to configure 4 or 5 picture memories and
then to activate extra memories as and when required.
28) Keyboard shortcuts
Although Pscan can be controlled entirely via the mouse, a number of
keyboard shortcuts (or "hot keys") are available. Note that these require
just a single keypress (not a two-key combination such as ALT+C) and work
with or without the caps lock LED illuminated:-
C ..... Clear screen
F ..... Go to filer-screen
H ..... Help - displays this manual
M ..... Mode select menu
N ..... ThumbNails
Q ..... QwikText captions
R ..... Receive (manual start)
T ..... Transmit
V ..... VIS start
1-8 ... Select picture memory
The mouse must still be used to abort RX or TX operations. These shortcuts
are only available when the main screen and the tool bar are displayed.
29) JPEG loading - more details
Pscan now uses the very fast JPEG routines provided in the "SpriteExtend"
module (version 0.99 or later) to allow rapid loading of JPEG images. The
module is included inside the !Pscan application and it will be loaded
automatically if it is not already available; a computer fitted with OS 3.
60 or later will already have this module installed.
Pscan will now correctly interpret the /JPG DOS filename extension,
allowing JPEG images to be loaded directly from DOS disks or PC-style CD-
ROMs. However, due to the 10-character Risc OS filename limit, long DOS
filenames will become truncated, possibly leaving just /J or /JP as the
last characters. Pscan overcomes this problem by assuming that a filename
ending with /J or /JP is also a JPEG image. The most likely error message
will be "Message token BadJPEG not found" if the file being loaded is not
actually a JPEG image.
Pscan uses the currently selected picture memory as workspace for the JPEG
decoding process. The maximum filesize that can be accommodated is
therefore 640k, but in practice this should be more than enough.
The JPEG routines in SpriteExtend 0.99 make it very easy to crop or scale a
picture as it is being loaded. Pscan allows four possible re-sizing options
to be chosen using the "Jpeg loading options" dialogue box on the filer-
screen. Here is description of the four choices available:-
Crop to 640 x 480 : If the image is larger than 640 x 480, a 640 x 480 area
will be taken from the centre of the image and a greyscale will be added
automatically to the top of the frame. This is the recommended option for
loading largish JPEG pictures, such as 768 x 512 or 800 x 600.
If the image is smaller than 640 x 480, the image will be positioned
centrally on the screen, leaving a margin of black around it, and again a
greyscale will be added to the top of the frame.
Crop to 640 x 512 : Very much the same as above, except that the entire
screen area will be used if necessary and no greyscale is added.
Scale to 640 x 480 : The image is scaled to 640 x 480 - irrespective of its
original size - and a greyscale is added.
Scale to 640 x 512 : As above but the entire screen area is used and no
greyscale is added.
When loading JPEG pictures that have been received with Pscan, either of
the 640 x 512 options can be chosen.
Once the picture has been loaded, a small info box will be displayed
showing the original size of the image and how long it took to load.
Knowing the original size of the picture could be useful in determining
whether the most appropriate crop/scale option was used. The info box will
disappear after a few seconds or the next time a mouse button is clicked.
It is NOT necessary to wait for the info box to disappear before carrying
out further Pscan operations.
Finally, the new SpriteExtend module appears to handle masked 32k-colour
sprites rather better than earlier versions, and moving large sprite
"overlays" around the screen is now much faster.
30) Mono (black & white) FAX
All standard FAX speeds from 60 to 480 lines-per-minute can be received.
The required speed can be chosen from a FAX sub-menu included in the "SSTV
mode select" menu. Options are also provided to allow either every received
line to be displayed or an average of two or three adjacent lines. The
latter options give a more accurate aspect ratio when receiving most
weather maps and charts. The same start-up options are available as those
provided for "Hamcolor" FAX reception. See chapter 16 for details.
One point not made in chapter 16 is that it is possible to change the
picture position (if necessary) more than once per "start up". This is done
by clicking on adjust (which would normally cause a "re-sync" in SSTV
modes) and then moving the mouse as required and clicking menu again.
Perhaps the following example will make this clear:-
To receive a FAX transmission when the phasing signal has been missed,
proceed as follows: Choose the required speed from the FAX sub-menu; nearly
all weather maps are sent at 120 LPM. Click on the R icon on the Pscan tool
bar. Reception will begin immediately but the frame will most likely be
wrongly positioned. Once a few lines have been received it should become
obvious where the edge of the image should be. Most weather charts have a
white margin on either side of the picture which usually shows up as a
blank white strip as the scan progresses. Move the mouse pointer over this
strip and click menu (the middle mouse button). Subsequent lines should now
be received in the correct position. However, if the positioning is still
not correct hold the adjust mouse button until the pointer un-freezes, then
move the mouse and click menu again as required.
Just one final point on manual start-ups in FAX mode: It is still necessary
to click the menu mouse button even if the picture is - by chance - in the
correct position immediately following a manual start. Until menu is
clicked the Risc PC's interrupts are enabled, which will give rather sub-
standard pictures. If no change of position is required simply move the
mouse pointer to the left edge of the screen and click menu.
When the scan reaches the bottom of the frame the image will start to
scroll upwards. New received lines will be drawn at the bottom of the frame
whilst the first lines received begin to disappear off the top of the
screen. Lines lost in this way cannot be recovered. Scrolling continues for
about 500 lines, although reception can be stopped at any time by holding
down select. Most weather charts tend to have more lines than can be
displayed on the Pscan screen, although this depends to some degree on how
many lines are averaged. The scrolling process allows the user to wait
until the most interesting area of the chart is visible before aborting
reception.
Black-and-white or colour pictures can be transmitted in monochrome FAX at
any speed between 120 and 480 LPM. Although 60 and 90 LPM can also be
selected, the phasing signal does work properly at these speeds. In any
case, even 120 LPM requires a very long transmission time and it is
doubtful that any benefit could be gained from an even slower speed.
If a colour picture is transmitted in mono FAX only the green separation is
used. This is perfectly acceptable as green makes up about 60% of the
luminance (or "brightness") of a monochrome image. However, it does mean
that areas of fully saturated colour will be transmitted as either black or
white, depending on their green content. For example, an area of full
yellow will be transmitted as white, as yellow is a mixture of red and
green. An area of magenta (purple) will be transmitted as black, as magenta
is a combination of red and blue with no green at all. On an average
picture, these effects will be minimal.
For amateur use, a speed of 240 LPM gives good quality in a reasonable
transmission time. The receiving station should ideally set an IOC of 204,
but an IOC of 288 is acceptable. In the JVFAX program, the "Ham288b" mode
(mode 4) is compatible with a Pscan transmission at 240 LPM, although the
picture will appear slightly squashed. It is very easy for a JVFAX user to
change the Ham288b mode to an IOC of 204 (using the mode editor) and this
should be encouraged.
In all mono FAX speeds Pscan sends a start-tone of 675 Hz, which matches
that used by JVFAX. The standard 450 Hz stop-tone is used; remember that
when aborting a TX early the stop-tone is always sent, resulting in a delay
of a few seconds before the tool bar returns.
Finally, please note that the "average" options in the mono FAX sub-menu
have no effect when transmitting.
31) Masked text sprites
The best way to explain the use of "masked text sprites" to create
colourful captions in Pscan is by way of an example:-
From the "Text / sprite overlays" menu, go to the "Text mask options" sub-
menu. Select the "Create text mask" option and then highlight and click on
one of the fonts in the font list. At the "Enter text line 1" prompt, type
in something simple like "G9ZZZ SSTV" and hit <return>. A prompt for a
second line of text will now appear; hit <return> only if this is not
required. Enter a value of 80 for the x point size and the same for the y
point size. The text mask will now be displayed in the top half of the
screen. The actual letters will be transparent (the blue background will
show through) and they will be surrounded by a white box.
The size of the text mask can now be adjusted (if required) by clicking on
the relevant arrows in the "re-size" window. Once the desired size is
achieved, click on the OK box or hit <return>. The main Text / sprite
overlays menu will be re-displayed; click on the [Close menu] option to
close it. The text mask is now ready for stage two of the process.
Open up the "Backgrounds" menu and go to the "Miscellaneous" sub-menu.
Click on the "Squares" option and the screen will be filled with an array
of squares gradating from orange to yellow. Now open up the "Text / sprite
overlays", go to the "Text mask options" sub-menu again and then click on
the "Plot text mask" entry. The mask can now be moved around the screen
using the mouse. When it is in the required position - anywhere will do for
now - click select. The mask will be plotted on the background and a new
masked sprite will be created. The new sprite - called simply "textmask" -
can now be selected from the Text / sprite overlay menu (the last-but-one
entry in the menu) and placed on to any picture. The "Overlay outline" sub-
menu can be used to add a shadow or an outline; the "Soft multiple shadow"
effect is used by default if no other option is chosen. The three shadow
effects can used with any sprite overlay that has a mask, such as those
created using !Paint. If a shadow option is selected and the sprite does
not have a mask, the shadow will look a little strange, although it might
still be acceptable.
The above example describes just one of the many possible ways in which
masked text sprites can be used. The mask can be placed on top of ANY
picture, not just a specially prepared background. Two lines of text can be
used, as per the normal "Create text overlay" option. At the moment it is
not possible to create vertical captions using masked sprites, but this
facility might be available in future versions of Pscan.
It is important to understand the difference between captions created using
the new "masked text sprites" and captions created using the normal "Create
text overlay" option in the Text / sprite overlay menu. The former use
standard Risc OS sprites whereas the latter use my own "Pscan format"
sprite system. Only the Pscan format sprites can use the full range of
borders, shadows, outlines and text colours. The standard Risc OS sprites -
textmasks or sprites loaded from disk - have a more limited range of
options and these are available in the "Overlay outline" sub-menu. I hope
to eventually combine the two systems, but this is a major undertaking and
it will not be ready for some time.
Masked sprites created using the above procedure can be saved via the Pscan
filer-screen. The normal entry method can be used - clicking on the green
filing cabinet icon - or the "Save 'textmask'" entry in the Text and sprite
overlays menu can be used. Note that the latter option only appears if a
suitable sprite has been created. Once on the filer-screen, choose or
create a suitable directory and then click on the SAVE icon. Enter a
filename and ensure that the "Save sprite overlay" button is selected.
Click on SAVE to save the sprite. Once saved, the masked sprite/overlay can
be loaded back into Pscan by simply clicking on its icon in the filer-
screen display.
Large masked sprites take up quite a lot of memory and this is taken from
the sprite overlay allocation. To allow sprites as large as the screen to
be created, set the "Overlay" option in the Choices window to 700k or more.
32) Thumbnails
Pscan now supports "thumbnail" banks which allow frequently-used pictures
to be loaded quickly from any directory on any hard drive. This feature
really comes into its own when a very large number of SSTV pictures are
stored in several directories on one or more hard disks. Moving through a
convoluted directory structure and then choosing the correct picture can be
quite time consuming. Loading from the thumbnail bank entails just one
mouse click over a miniature version of the required picture. Each "bank"
holds 32 thumbnails and up to 32 banks can be created.
To access the thumbnail display, click on the thumbnail icon located next
to the green filing cabinet icon on the Pscan tool bar. The first bank of
32 miniature pictures will be displayed (obviously blank if you are just
starting) plus a strip of numbered miniature pictures showing the contents
of the picture memories. The currently selected picture memory will
highlighted; clicking select on one of the numbered mini-pictures makes
that picture the currently selected memory.
There are two parts to the thumbnail system: Adding pictures to the
thumbnail bank(s) and loading pictures using the thumbnails. To start
adding pictures to the thumbnail display, proceed as follows:-
- Load the required pictures using the normal filer-screen options. Fill as
few or as many picture memories as you like.
- Having loaded some pictures, click on the thumbnail icon on the tool bar.
Miniature versions of the pictures just loaded will be shown in the strip
near the top of the screen.
- To add pictures to the thumbnail bank, click and hold select over the
required picture in the top strip. A rectangular cursor will appear;
drag this to the required thumbnail box and then release select.
A miniature copy of the dragged picture will now appear in the thumbnail
bank. As many pictures as required can be dragged from the picture memory
boxes to the thumbnail boxes. Existing pictures in the thumbnail boxes can
be overwritten if required.
When all the picture dragging is complete, click on the "Close thumbnails"
box. The updated thumbnail bank will be saved back to disk. Additional
thumbnail banks can be created if required by clicking on the "Create new
bank" box. If more than one thumbnail bank has been created click on the
left and right arrows next to the "Bank select" box to select the required
bank. A click with select (left mouse button) will increment or decrement
the bank number by 1 whereas a click with adjust (right mouse button) will
go directly to the highest or lowest available bank number. This might be
useful if a large number of thumbnail banks have been created.
Although the thumbnail system is mainly intended to provide a shortcut when
loading frequently-used TX pictures, received pictures can be added to the
thumbnails if required. However, they must first be saved using the
standard filer-screen options. This also applies to modified pictures. For
example, if a picture is loaded into memory and a caption is added, the
picture must be re�saved before it can be added to a thumbnail bank.
There are two ways to load a picture using the thumbnail system: A single
click with select on a thumbnail mini-picture will load that picture into
the currently selected picture memory. If required, the currently selected
memory can first be changed by clicking with select on one of the top row
of numbered picture memories in the thumbnail display.
The second loading method involves dragging images from the bank of 32
thumbnails into the top row of picture memories. As many drags as required
can be performed, the only limitation being the number of picture memories
available. As with the thumbnail updates, pictures can be repeatedly
dragged into the same picture memory; the last one dragged is the one that
will be loaded. Loading of the picture memories takes place when the "Close
thumbnails" box is clicked.
As the mouse pointer is moved around the thumbnail boxes, the full pathname
of the picture that the mouse pointer is over will be displayed. This can
help to locate a picture that needs to be deleted or moved.
If a picture file is deleted (using either the options on the Pscan filer
display or the standard desktop facilities) the corresponding thumbnail
entry (assuming there is one) will not be affected. This leads to what
other thumbnail systems describe as "orphans" - entries in the thumbnail
bank which no longer have a "parent" picture. If an attempt is made to load
an orphaned picture from the thumbnail bank, an error message will be
displayed and that thumbnail entry will be blanked automatically. It can
then be re-used if required.
If the "Undo last updates" box is clicked then any work carried out on the
thumbnail screen (in the current "session" only) will be reversed, except
for the creation of new thumbnail banks. The undo applies to drags in
either direction - adding pictures to the thumbnail banks or loading
picture into memory.
Thumbnails - extra technical information
Each thumbnail bank consists of two parts. A standard Risc OS sprite (640 x
256 x 32k-colours) and a file holding the full pathnames of each of the
images within the thumbnail bank. The first sprite has a filename of
"ThumbPix01" and the matching pathname file is called "ThumPath01". The
numeric suffix is incremented for each new thumbnail bank created. The
actual sprite within the spritefile is called "thumbnails" and is the same
for all banks. All the thumbnail files are located inside the "Thumbs"
directory which is inside the !Pscan application.
Apart from the complete 32-thumbnail sprite, no extra files are saved when
a picture is added to a thumbnail bank. Each thumbnail bank occupies 325k
of hard disk space, irrespective of the number of pictures it holds. If
excess thumbnail banks are created, they can be deleted from the Thumbs
directory inside !Pscan. Pscan automatically checks to see how many banks
are available when it is first started. It is important not to leave any
gaps in the numeric sequence; always delete the highest numbered thumbnail
bank and don't forget to delete both the "ThumbPixXX" spritefile and the
"ThumPathXX" text file. If the ThumbPix01 or ThumPath01 files are deleted
accidentally, Pscan will create blank files automatically the next time the
program is started from cold.
33) Experimental SSTV repeater
Pscan now incorporates an experimental SSTV repeater, intended for use on
FM only. The idea is to provide an automated alternative to the common
practice of "replaying" a received picture for others to see. A well-sited
station can operate Pscan in repeater mode to allow his locals to work
further than they would otherwise be able to do.
Here is a brief overview of the repeater "logic":
A station wishing to use the repeater transmits a 1750 Hz toneburst; about
300�mS duration is sufficient. On receiving a valid toneburst, the repeater
checks that the channel is clear of SSTV activity and then transmits in
morse code (with a 1 KHz tone) the "Repeater CW ID" text as shown in the
Choices window. Note that it takes about 5 seconds to check for SSTV
activity, so potential users of the repeater should be advised to wait at
least that long before assuming that there access attempt was unsuccessful.
After sending the CW ID text, the repeater will start searching for a valid
SSTV VIS code. If one is not found within 15 seconds the repeater goes back
into "standby" mode, searching again for a 1750 Hz toneburst.
Assuming that a valid VIS is found, the accompanying picture will be
received. The repeater will accept all the SSTV modes supported by Pscan,
although if HQ1 or HQ2 modes are received the "replay" will be in Martin 1
mode. When picture reception is complete, the repeater again checks the
channel for other SSTV activity. If none is found, the received picture
will be retransmitted (in the same SSTV mode it was received in) with a new
greyscale and a short header message. After the retransmission is complete,
the software reverts to standby mode, waiting for a 1750 Hz toneburst.
Technical notes:
The bandwidth of the 1750 Hz toneburst detector can be set in the Choices
window. A value of 40 - representing plus-and-minus 20 Hz - is taken by
default but this value is worth experimenting with. The VIS detector used
in repeater mode is narrower than normal, which should help to prevent
false triggering. The VIS bandwidth is not user-definable. The narrow VIS
detector and the 1750 Hz toneburst requirement more-or-less prevent the
repeater from being used on SSB.
Entering repeater mode:
Click on the "Repeater mode" option in the "Tools and utilities" menu. A
status panel will be displayed, with "LED" indicators showing the current
state of the repeater "logic". Initially the top LED will be yellow,
indicating that the repeater software is searching for a 1750 Hz toneburst.
When this is found the LED turns green and the next LED lights up yellow,
indicating that the software is checking for SSTV activity. This
progression of green and yellow LEDs continues until all four are yellow -
note that the VIS LED flashes, as it does in normal SSTV operation.
As well as the main status panel, a scrolling text display in the lower
half of the screen gives a "running commentary" on the current repeater
status. Typical of the messages given are:-
Searching for toneburst ...
19:24:30 Toneburst found - checking for channel activity ...
***** Channel busy - access denied *****
or
Searching for toneburst ...
19:24:30 Toneburst found - checking for channel activity ...
Channel seems clear - sending 'DE G4IJE K' on CW ...
Now waiting up to 15 seconds for a VIS ..."
When all the required conditions are met - a valid toneburst, no SSTV on
the channel and then a valid VIS is found - the screen will clear and the
picture will be received. During reception the usual RX mouse clicks are
still available, so a click on the right mouse button can be used to re-
sync the picture if necessary. A left click will abort reception and also
exit repeater mode. When the picture has finished the software will again
check that the channel is clear of SSTV activity, and if none is found the
picture will be retransmitted in the mode that it was received in. A
standard type-2 Pscan greyscale will be added to the top of the frame along
with the text "G4IJE Pscan repeater" in yellow letters, the callsign being
taken from the "Testcard callsign" entry in the Choices window.
If the channel is busy (with other SSTV activity) when it is time for the
repeater to re-transmit a received picture, it will wait for up to 3
minutes for the channel to clear. If it does not clear within this time the
repeater will revert to standby mode and the received picture will be lost.
An optional "beacon" mode is available, which will transmit a page of
instructions on how to use the Pscan repeater facility. The beacon is
turned on or off by clicking on the "Repeater beacon" option in the Tools
and utilities menu. If the beacon is turned on and no-one has accessed the
repeater for 10 minutes, the instruction page will be transmitted in Martin
1 mode, followed by a CW ident. The repeater then reverts to standy mode,
waiting for a 1750 Hz access tone.
The beacon page can also be displayed by clicking on the "Rpeater beacon
page" option in the Test patterns menu. It can then be transmitted in any
of the available SSTV or FAX modes.
PLEASE NOTE: My understanding of the license conditions is that an SSTV
repeater is legal as long as it is not left unattended. Unattended
operation would probably still be illegal even for those who hold a packet
radio NOV (Notice of Variation). This (I believe) allows unattended
operation, but only for digital modes, which of course SSTV is not. It is
up to the individual Pscan user to determine the legallity of the repeater
mode. The author cannot be held responsible for any breaches of the amateur
radio licence conditions.
Please let me have your comments and criticisms on the SSTV repeater
facility.
34) *** New in version 3.10 ***
This chapter describes features added since version 3.00:-
Filer changes:
It is now possible to create a new directory from the filer-screen. Also
added to the filer-screen is the option to save sprite overlays, such as
those created using the "text mask" options in the "Text and sprite
overlays". "Grabbed" screen areas, either rectangular or oval-shaped, can
also be saved. See chapter 31 for more details.
On-line manual memory allocation:
The memory required for the on-line manual is now kept in a separate area
from the sprite overlay memory. In previous versions of Pscan a shared area
was used, which resulted in the deletion of text and/or sprites when the
manual was accessed from within Pscan. As a consequence of this change,
Pscan now requires around 164k of extra memory, but with memory prices so
low, this shouldn't be a problem!
PD 50 mode implemented:
This is a new 320 x 256 mode. It gives slightly inferior results to
Martin 1 or PD90 but is much quicker. It is faster than Martin 2 and gives
much better picture quality. It could be useful when a "quick picture" is
required, possibly for SSTV repeater use. PD50 will be available to WinPix
Pro users soon.
Registration:
This is now done via a PIN number issued to each registered user. Click on
the "Register..." option in the icon bar menu and enter your callsign, PIN
and name. This new technique will be a great time-saver for me, as I will
no longer have to send customised TX code to each registered user when I
release a new version of Pscan. See chapter 4 for a more information.
35) Contacting the author and registration details
Paul Turner G4IJE Telephone : +44 (0)1279 734482 (home)
61 Primley Lane +44 (0)1279 718596 (work)
Sheering e-mail : Paulg4ije@aol.com
Bishops Stortford website : http://members.aol.com/pscansstv/
Herts CM22 7NH Packet radio : G4IJE @ GB7DAA.#33.GBR.EU
To register Pscan, please send �15.00 to Paul Turner at the address above.
As the amount is small, cash should be safe enough in the post, although a
cheque is also quite acceptable. Registered users are sent a unique PIN
number which allows them to encode their callsign into Pscan for TX use.
Now that the most up-to-date version of Pscan is available from my Internet
website, the benefits of registration are probably less than they once
were. I fully accept this but hope that users will still consider
registering the program, as it provides encouragement for me to continue
development work.
Have fun with Pscan and please let me know how you get on. If you have any
suggestions for changes or improvements to the software, I will be very
pleased to hear from you.
73 from Paul Turner, G4IJE - 25th January 1998
��
00000000 0a 30 30 29 20 50 73 63 61 6e 20 76 65 72 73 69 |.00) Pscan versi|
00000010 6f 6e 20 33 2e 31 30 20 2d 20 32 35 74 68 20 4a |on 3.10 - 25th J|
00000020 61 6e 61 75 72 79 20 31 39 39 38 20 2d 20 62 79 |anaury 1998 - by|
00000030 20 50 61 75 6c 20 54 75 72 6e 65 72 20 47 34 49 | Paul Turner G4I|
00000040 4a 45 0a 0a 20 49 6e 64 65 78 20 6f 66 20 63 68 |JE.. Index of ch|
00000050 61 70 74 65 72 73 3a 2d 0a 0a 20 30 31 20 2e 2e |apters:-.. 01 ..|
00000060 2e 20 43 6f 6e 76 65 6e 74 69 6f 6e 73 20 61 6e |. Conventions an|
00000070 64 20 6d 6f 6e 69 74 6f 72 20 6e 6f 74 65 73 20 |d monitor notes |
00000080 20 20 20 30 32 20 2e 2e 2e 20 49 6e 74 65 72 66 | 02 ... Interf|
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000000c0 61 6e 20 20 20 20 20 20 20 20 20 20 20 20 20 30 |an 0|
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00000100 67 20 50 73 63 61 6e 20 20 20 20 20 20 20 20 20 |g Pscan |
00000110 20 20 20 20 20 20 20 20 20 20 20 30 36 20 2e 2e | 06 ..|
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00000230 20 20 20 20 20 20 31 34 20 2e 2e 2e 20 54 68 65 | 14 ... The|
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000031b0 53 65 65 20 74 68 65 20 52 65 61 64 4d 65 20 66 |See the ReadMe f|
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00003690 20 69 6e 0a 74 68 65 20 69 63 6f 6e 20 62 61 72 | in.the icon bar|
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00003890 64 20 61 6c 73 6f 20 6d 65 61 6e 73 20 74 68 61 |d also means tha|
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00003900 64 20 50 73 63 61 6e 20 75 73 65 72 2c 20 73 65 |d Pscan user, se|
00003910 65 20 63 68 61 70 74 65 72 20 33 35 20 66 6f 72 |e chapter 35 for|
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00003930 6e 2e 0a 0a 0a 30 35 29 20 52 75 6e 6e 69 6e 67 |n....05) Running|
00003940 20 50 73 63 61 6e 0a 0a 41 20 73 69 6e 67 6c 65 | Pscan..A single|
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000039f0 6c 6c 20 74 68 65 20 66 65 61 74 75 72 65 73 20 |ll the features |
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00003ab0 63 74 20 74 68 65 0a 72 65 71 75 69 72 65 64 20 |ct the.required |
00003ac0 70 69 63 74 75 72 65 20 6d 65 6d 6f 72 79 2e 20 |picture memory. |
00003ad0 55 70 20 74 6f 20 65 69 67 68 74 20 70 69 63 74 |Up to eight pict|
00003ae0 75 72 65 73 20 63 61 6e 20 62 65 20 73 74 6f 72 |ures can be stor|
00003af0 65 64 20 69 6e 20 6d 65 6d 6f 72 79 20 61 74 20 |ed in memory at |
00003b00 61 0a 74 69 6d 65 2c 20 61 6c 74 68 6f 75 67 68 |a.time, although|
00003b10 20 74 68 69 73 20 72 65 71 75 69 72 65 73 20 61 | this requires a|
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00003b40 52 41 4d 20 66 69 74 74 65 64 2e 0a 50 73 63 61 |RAM fitted..Psca|
00003b50 6e 20 69 73 20 6e 6f 72 6d 61 6c 6c 79 20 73 75 |n is normally su|
00003b60 70 70 6c 69 65 64 20 77 69 74 68 20 74 68 65 20 |pplied with the |
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00003b80 65 20 6d 65 6d 6f 72 69 65 73 20 73 65 74 20 74 |e memories set t|
00003b90 6f 0a 74 68 72 65 65 2c 20 61 73 20 74 68 69 73 |o.three, as this|
00003ba0 20 61 6c 6c 6f 77 73 20 74 68 65 20 73 6f 66 74 | allows the soft|
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00003bf0 20 74 68 61 6e 20 65 69 67 68 74 20 6d 65 6d 6f | than eight memo|
00003c00 72 69 65 73 20 61 72 65 20 63 6f 6e 66 69 67 75 |ries are configu|
00003c10 72 65 64 2c 20 74 68 65 20 75 6e 75 73 65 64 0a |red, the unused.|
00003c20 62 75 74 74 6f 6e 73 20 77 69 6c 6c 20 62 65 20 |buttons will be |
00003c30 62 6c 61 6e 6b 20 61 6e 64 20 63 6c 69 63 6b 69 |blank and clicki|
00003c40 6e 67 20 6f 6e 20 74 68 65 6d 20 77 69 6c 6c 20 |ng on them will |
00003c50 68 61 76 65 20 6e 6f 20 65 66 66 65 63 74 2e 20 |have no effect. |
00003c60 44 65 74 61 69 6c 73 20 6f 66 0a 68 6f 77 20 74 |Details of.how t|
00003c70 6f 20 63 68 61 6e 67 65 20 74 68 65 20 6e 75 6d |o change the num|
00003c80 62 65 72 20 6f 66 20 70 69 63 74 75 72 65 20 6d |ber of picture m|
00003c90 65 6d 6f 72 69 65 73 20 61 72 65 20 67 69 76 65 |emories are give|
00003ca0 6e 20 69 6e 20 63 68 61 70 74 65 72 20 31 34 20 |n in chapter 14 |
00003cb0 28 22 54 68 65 0a 43 68 6f 69 63 65 73 20 77 69 |("The.Choices wi|
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00003cd0 20 63 68 61 70 74 65 72 20 32 37 20 66 6f 72 20 | chapter 27 for |
00003ce0 64 65 74 61 69 6c 73 20 6f 66 20 68 6f 77 20 74 |details of how t|
00003cf0 6f 20 74 65 6d 70 6f 72 61 72 69 6c 79 0a 69 6e |o temporarily.in|
00003d00 63 72 65 61 73 65 20 74 68 65 20 6e 75 6d 62 65 |crease the numbe|
00003d10 72 20 6f 66 20 70 69 63 74 75 72 65 20 6d 65 6d |r of picture mem|
00003d20 6f 72 69 65 73 20 77 69 74 68 6f 75 74 20 75 73 |ories without us|
00003d30 69 6e 67 20 74 68 65 20 43 68 6f 69 63 65 73 20 |ing the Choices |
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00003d50 6c 20 62 61 72 20 63 61 6e 20 62 65 20 72 65 6d |l bar can be rem|
00003d60 6f 76 65 64 20 74 65 6d 70 6f 72 61 72 69 6c 79 |oved temporarily|
00003d70 20 62 79 20 63 6c 69 63 6b 69 6e 67 20 73 65 6c | by clicking sel|
00003d80 65 63 74 20 77 69 74 68 20 74 68 65 20 6d 6f 75 |ect with the mou|
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00003da0 69 6f 6e 65 64 20 61 6e 79 77 68 65 72 65 20 61 |ioned anywhere a|
00003db0 62 6f 76 65 20 74 68 65 20 74 6f 6f 6c 20 62 61 |bove the tool ba|
00003dc0 72 2e 20 54 68 69 73 20 61 6c 6c 6f 77 73 20 74 |r. This allows t|
00003dd0 68 65 20 62 6f 74 74 6f 6d 0a 6c 69 6e 65 73 20 |he bottom.lines |
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00003e00 63 6b 20 73 65 6c 65 63 74 20 61 67 61 69 6e 20 |ck select again |
00003e10 74 6f 20 72 65 73 74 6f 72 65 20 74 68 65 20 74 |to restore the t|
00003e20 6f 6f 6c 0a 62 61 72 2e 0a 0a 50 69 63 74 75 72 |ool.bar...Pictur|
00003e30 65 73 20 63 61 6e 20 62 65 20 74 72 61 6e 73 6d |es can be transm|
00003e40 69 74 74 65 64 20 66 72 6f 6d 20 61 6e 79 20 6f |itted from any o|
00003e50 66 20 74 68 65 20 70 69 63 74 75 72 65 20 6d 65 |f the picture me|
00003e60 6d 6f 72 69 65 73 20 61 6e 64 20 61 6c 73 6f 0a |mories and also.|
00003e70 72 65 63 65 69 76 65 64 20 69 6e 74 6f 20 61 6e |received into an|
00003e80 79 20 6d 65 6d 6f 72 79 2e 20 41 6c 6c 20 6c 6f |y memory. All lo|
00003e90 61 64 69 6e 67 2c 20 73 61 76 69 6e 67 20 61 6e |ading, saving an|
00003ea0 64 20 67 72 61 70 68 69 63 73 20 77 6f 72 6b 20 |d graphics work |
00003eb0 69 73 20 61 6c 77 61 79 73 0a 63 61 72 72 69 65 |is always.carrie|
00003ec0 64 20 6f 75 74 20 6f 6e 20 74 68 65 20 63 75 72 |d out on the cur|
00003ed0 72 65 6e 74 6c 79 20 73 65 6c 65 63 74 65 64 20 |rently selected |
00003ee0 70 69 63 74 75 72 65 20 6d 65 6d 6f 72 79 2e 0a |picture memory..|
00003ef0 0a 0a 30 36 29 20 52 65 63 65 69 76 69 6e 67 20 |..06) Receiving |
00003f00 53 53 54 56 20 70 69 63 74 75 72 65 73 0a 0a 54 |SSTV pictures..T|
00003f10 68 65 72 65 20 61 72 65 20 74 68 72 65 65 20 77 |here are three w|
00003f20 61 79 73 20 6f 66 20 69 6e 69 74 69 61 74 69 6e |ays of initiatin|
00003f30 67 20 70 69 63 74 75 72 65 20 72 65 63 65 70 74 |g picture recept|
00003f40 69 6f 6e 3b 20 61 20 22 56 49 53 22 20 73 74 61 |ion; a "VIS" sta|
00003f50 72 74 2c 20 61 0a 22 6d 61 6e 75 61 6c 22 20 73 |rt, a."manual" s|
00003f60 74 61 72 74 20 61 6e 64 20 61 6e 20 22 61 75 74 |tart and an "aut|
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*
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0000daa0 20 6d 6f 72 65 20 73 75 69 74 61 62 6c 65 2e 20 | more suitable. |
0000dab0 53 65 65 20 63 68 61 70 74 65 72 20 32 35 20 66 |See chapter 25 f|
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0000dc70 65 20 63 68 61 70 74 65 72 20 31 34 20 2d 20 54 |e chapter 14 - T|
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000120d0 65 76 65 6e 20 77 69 74 68 20 61 20 74 75 6e 69 |even with a tuni|
000120e0 6e 67 20 65 72 72 6f 72 20 6f 66 20 70 6c 75 73 |ng error of plus|
000120f0 2d 6f 72 2d 6d 69 6e 75 73 20 31 35 30 0a 48 7a |-or-minus 150.Hz|
00012100 2e 0a 0a 54 68 65 72 65 20 61 72 65 20 66 69 76 |...There are fiv|
00012110 65 20 50 44 20 6d 6f 64 65 73 20 61 6c 74 6f 67 |e PD modes altog|
00012120 65 74 68 65 72 2c 20 69 64 65 6e 74 69 66 69 65 |ether, identifie|
00012130 64 20 62 79 20 74 68 65 20 6c 65 74 74 65 72 73 |d by the letters|
00012140 20 22 50 44 22 20 66 6f 6c 6c 6f 77 65 64 0a 62 | "PD" followed.b|
00012150 79 20 74 68 65 20 61 70 70 72 6f 78 69 6d 61 74 |y the approximat|
00012160 65 20 66 72 61 6d 65 20 74 69 6d 65 20 69 6e 20 |e frame time in |
00012170 73 65 63 6f 6e 64 73 2e 20 41 6c 6c 20 6d 6f 64 |seconds. All mod|
00012180 65 73 20 68 61 76 65 20 61 20 63 6f 6d 70 75 6c |es have a compul|
00012190 73 6f 72 79 20 31 36 0a 6c 69 6e 65 20 67 72 65 |sory 16.line gre|
000121a0 79 73 63 61 6c 65 20 68 65 61 64 65 72 20 77 68 |yscale header wh|
000121b0 69 63 68 20 69 73 20 69 6e 63 6c 75 64 65 64 20 |ich is included |
000121c0 69 6e 20 74 68 65 20 66 6f 6c 6c 6f 77 69 6e 67 |in the following|
000121d0 20 69 6e 66 6f 72 6d 61 74 69 6f 6e 3a 2d 0a 0a | information:-..|
000121e0 4d 6f 64 65 20 6e 61 6d 65 20 20 52 65 73 6f 6c |Mode name Resol|
000121f0 75 74 69 6f 6e 20 20 46 72 61 6d 65 20 74 69 6d |ution Frame tim|
00012200 65 20 20 20 52 65 6d 61 72 6b 73 0a 20 50 44 20 |e Remarks. PD |
00012210 20 35 30 20 20 20 20 33 32 30 20 58 20 32 35 36 | 50 320 X 256|
00012220 20 20 20 20 35 30 20 73 65 63 6f 6e 64 73 20 20 | 50 seconds |
00012230 53 6c 69 67 68 74 6c 79 20 73 6f 66 74 65 72 20 |Slightly softer |
00012240 74 68 61 6e 20 4d 31 20 6f 72 20 50 44 39 30 0a |than M1 or PD90.|
00012250 20 50 44 20 20 39 30 20 20 20 20 33 32 30 20 58 | PD 90 320 X|
00012260 20 32 35 36 20 20 20 20 39 30 20 73 65 63 6f 6e | 256 90 secon|
00012270 64 73 20 20 41 20 70 6f 73 73 69 62 6c 65 20 61 |ds A possible a|
00012280 6c 74 65 72 6e 61 74 69 76 65 20 74 6f 20 4d 61 |lternative to Ma|
00012290 72 74 69 6e 20 31 0a 20 50 44 20 31 36 30 20 20 |rtin 1. PD 160 |
000122a0 20 20 35 31 32 20 78 20 34 30 30 20 20 20 31 36 | 512 x 400 16|
000122b0 30 20 73 65 63 6f 6e 64 73 20 20 41 6e 20 6f 64 |0 seconds An od|
000122c0 64 20 73 69 7a 65 2c 20 62 75 74 20 63 61 6e 20 |d size, but can |
000122d0 62 65 20 75 73 65 66 75 6c 0a 20 50 44 20 31 32 |be useful. PD 12|
000122e0 30 20 20 20 20 36 34 30 20 78 20 34 39 36 20 20 |0 640 x 496 |
000122f0 20 31 32 36 20 73 65 63 6f 6e 64 73 20 20 53 6c | 126 seconds Sl|
00012300 69 67 68 74 6c 79 20 73 6f 66 74 65 72 20 74 68 |ightly softer th|
00012310 61 6e 20 50 44 31 38 30 0a 20 50 44 20 31 38 30 |an PD180. PD 180|
00012320 20 20 20 20 36 34 30 20 78 20 34 39 36 20 20 20 | 640 x 496 |
00012330 31 38 37 20 73 65 63 6f 6e 64 73 20 20 49 6e 74 |187 seconds Int|
00012340 65 6e 64 65 64 20 74 6f 20 62 65 20 74 68 65 20 |ended to be the |
00012350 73 74 61 6e 64 61 72 64 20 36 34 30 78 34 39 36 |standard 640x496|
00012360 20 6d 6f 64 65 0a 20 50 44 20 32 34 30 20 20 20 | mode. PD 240 |
00012370 20 36 34 30 20 78 20 34 39 36 20 20 20 32 34 38 | 640 x 496 248|
00012380 20 73 65 63 6f 6e 64 73 20 20 54 68 65 20 75 6c | seconds The ul|
00012390 74 69 6d 61 74 65 20 66 6f 72 20 56 48 46 20 28 |timate for VHF (|
000123a0 6f 72 20 48 46 29 20 77 6f 72 6b 0a 0a 54 68 65 |or HF) work..The|
000123b0 20 6c 61 74 74 65 72 20 74 68 72 65 65 20 6d 6f | latter three mo|
000123c0 64 65 73 20 61 6c 6c 20 67 69 76 65 20 61 20 76 |des all give a v|
000123d0 65 72 79 20 77 6f 72 74 68 77 68 69 6c 65 20 69 |ery worthwhile i|
000123e0 6e 63 72 65 61 73 65 20 69 6e 20 67 65 6e 75 69 |ncrease in genui|
000123f0 6e 65 0a 70 69 63 74 75 72 65 20 72 65 73 6f 6c |ne.picture resol|
00012400 75 74 69 6f 6e 2c 20 75 6e 6c 69 6b 65 20 6d 6f |ution, unlike mo|
00012410 64 65 73 20 73 75 63 68 20 61 73 20 4d 61 72 74 |des such as Mart|
00012420 69 6e 27 73 20 48 51 20 6d 6f 64 65 73 20 77 68 |in's HQ modes wh|
00012430 69 63 68 20 67 69 76 65 0a 73 68 61 72 70 65 72 |ich give.sharper|
00012440 20 70 69 63 74 75 72 65 73 20 74 68 61 6e 20 4d | pictures than M|
00012450 61 72 74 69 6e 20 31 20 62 75 74 20 73 74 69 6c |artin 1 but stil|
00012460 6c 20 61 74 20 6f 6e 6c 79 20 32 35 36 20 78 20 |l at only 256 x |
00012470 32 35 36 20 72 65 73 6f 6c 75 74 69 6f 6e 2e 0a |256 resolution..|
00012480 0a 44 6f 6e 20 61 6e 64 20 49 20 68 6f 70 65 20 |.Don and I hope |
00012490 74 68 61 74 20 6f 74 68 65 72 20 53 53 54 56 20 |that other SSTV |
000124a0 73 6f 66 74 77 61 72 65 20 77 72 69 74 65 72 73 |software writers|
000124b0 20 77 69 6c 6c 20 69 6e 63 6c 75 64 65 20 74 68 | will include th|
000124c0 65 20 50 44 20 6d 6f 64 65 73 0a 69 6e 20 74 68 |e PD modes.in th|
000124d0 65 69 72 20 73 79 73 74 65 6d 73 2e 20 41 20 64 |eir systems. A d|
000124e0 65 74 61 69 6c 65 64 20 73 70 65 63 69 66 69 63 |etailed specific|
000124f0 61 74 69 6f 6e 20 66 6f 72 20 74 68 65 20 6d 6f |ation for the mo|
00012500 64 65 73 20 69 73 20 61 76 61 69 6c 61 62 6c 65 |des is available|
00012510 20 6f 6e 0a 72 65 71 75 65 73 74 20 66 72 6f 6d | on.request from|
00012520 20 6d 65 2c 20 61 6c 6f 6e 67 20 77 69 74 68 20 | me, along with |
00012530 74 65 63 68 6e 69 63 61 6c 20 64 65 74 61 69 6c |technical detail|
00012540 73 20 6f 66 20 74 68 65 20 63 6f 6c 6f 75 72 0a |s of the colour.|
00012550 65 6e 63 6f 64 69 6e 67 2f 64 65 63 6f 64 69 6e |encoding/decodin|
00012560 67 20 6d 65 74 68 6f 64 2e 0a 0a 54 68 65 20 66 |g method...The f|
00012570 75 6c 6c 20 50 44 20 73 70 65 63 69 66 69 63 61 |ull PD specifica|
00012580 74 69 6f 6e 20 63 61 6e 20 61 6c 73 6f 20 62 65 |tion can also be|
00012590 20 66 6f 75 6e 64 20 6f 6e 20 44 6f 6e 27 73 20 | found on Don's |
000125a0 77 65 62 20 70 61 67 65 2c 20 6c 6f 63 61 74 65 |web page, locate|
000125b0 64 20 61 74 3a 2d 0a 20 68 74 74 70 3a 2f 2f 77 |d at:-. http://w|
000125c0 77 77 2e 73 6b 79 70 6f 69 6e 74 2e 63 6f 6d 2f |ww.skypoint.com/|
000125d0 7e 6b 30 68 65 6f 0a 0a 49 74 20 63 61 6e 20 61 |~k0heo..It can a|
000125e0 6c 73 6f 20 6e 6f 77 20 62 65 20 66 6f 75 6e 64 |lso now be found|
000125f0 20 6f 6e 20 6d 79 20 77 65 62 73 69 74 65 2c 20 | on my website, |
00012600 6c 6f 63 61 74 65 64 20 61 74 3a 2d 0a 20 68 74 |located at:-. ht|
00012610 74 70 3a 2f 2f 6d 65 6d 62 65 72 73 2e 61 6f 6c |tp://members.aol|
00012620 2e 63 6f 6d 2f 70 73 63 61 6e 73 73 74 76 2f 0a |.com/pscansstv/.|
00012630 0a 0a 31 39 29 20 50 44 20 6d 6f 64 65 73 20 69 |..19) PD modes i|
00012640 6e 20 50 73 63 61 6e 0a 0a 54 68 65 20 50 44 20 |n Pscan..The PD |
00012650 6d 6f 64 65 73 20 61 72 65 20 75 73 65 64 20 6d |modes are used m|
00012660 75 63 68 20 6c 69 6b 65 20 61 6e 79 20 6f 74 68 |uch like any oth|
00012670 65 72 20 53 53 54 56 20 6d 6f 64 65 2e 20 54 68 |er SSTV mode. Th|
00012680 65 79 20 61 6c 6c 20 69 6e 63 6c 75 64 65 20 61 |ey all include a|
00012690 20 56 49 53 0a 63 6f 64 65 20 73 6f 20 61 75 74 | VIS.code so aut|
000126a0 6f 6d 61 74 69 63 20 6d 6f 64 65 20 73 65 6c 65 |omatic mode sele|
000126b0 63 74 69 6f 6e 20 69 73 20 70 6f 73 73 69 62 6c |ction is possibl|
000126c0 65 2e 20 41 20 6d 61 6e 75 61 6c 20 73 74 61 72 |e. A manual star|
000126d0 74 20 63 61 6e 20 61 6c 73 6f 20 62 65 0a 6d 61 |t can also be.ma|
000126e0 64 65 20 61 6e 64 20 74 68 65 20 75 73 75 61 6c |de and the usual|
000126f0 20 22 72 65 2d 73 79 6e 63 22 20 66 61 63 69 6c | "re-sync" facil|
00012700 69 74 79 20 28 74 68 65 20 61 64 6a 75 73 74 20 |ity (the adjust |
00012710 6d 6f 75 73 65 20 62 75 74 74 6f 6e 29 20 69 73 |mouse button) is|
00012720 0a 61 76 61 69 6c 61 62 6c 65 2e 0a 0a 54 68 65 |.available...The|
00012730 20 61 75 74 6f 2d 74 75 6e 69 6e 67 20 66 61 63 | auto-tuning fac|
00012740 69 6c 69 74 79 2c 20 77 68 69 63 68 20 70 72 65 |ility, which pre|
00012750 76 65 6e 74 73 20 74 75 6e 69 6e 67 20 65 72 72 |vents tuning err|
00012760 6f 72 20 66 72 6f 6d 20 63 61 75 73 69 6e 67 20 |or from causing |
00012770 63 6f 6c 6f 75 72 0a 63 68 61 6e 67 65 73 20 6f |colour.changes o|
00012780 6e 20 53 53 42 2c 20 63 61 6e 20 62 65 20 73 77 |n SSB, can be sw|
00012790 69 74 63 68 65 64 20 6f 66 66 20 69 66 20 72 65 |itched off if re|
000127a0 71 75 69 72 65 64 2e 20 54 68 69 73 20 63 61 6e |quired. This can|
000127b0 20 62 65 20 75 73 65 66 75 6c 20 77 68 65 6e 0a | be useful when.|
000127c0 77 6f 72 6b 69 6e 67 20 77 69 74 68 20 6e 6f 69 |working with noi|
000127d0 73 79 20 46 4d 20 73 69 67 6e 61 6c 73 20 6f 6e |sy FM signals on|
000127e0 20 74 77 6f 20 6d 65 74 72 65 73 2c 20 61 73 20 | two metres, as |
000127f0 74 68 65 20 6e 6f 69 73 65 20 63 61 6e 20 6f 63 |the noise can oc|
00012800 63 61 73 69 6f 6e 61 6c 6c 79 0a 63 61 75 73 65 |casionally.cause|
00012810 20 74 68 65 20 61 75 74 6f 2d 74 75 6e 65 20 74 | the auto-tune t|
00012820 6f 20 61 70 70 6c 79 20 61 6e 20 65 72 72 6f 6e |o apply an erron|
00012830 65 6f 75 73 20 63 6f 72 72 65 63 74 69 6f 6e 2e |eous correction.|
00012840 20 41 20 22 50 44 20 61 75 74 6f 2d 74 75 6e 65 | A "PD auto-tune|
00012850 0a 63 6f 6e 74 72 6f 6c 22 20 73 75 62 2d 6d 65 |.control" sub-me|
00012860 6e 75 20 69 73 20 70 72 6f 76 69 64 65 64 20 6f |nu is provided o|
00012870 6e 20 74 68 65 20 6d 6f 64 65 20 6d 65 6e 75 20 |n the mode menu |
00012880 77 68 69 63 68 20 61 6c 6c 6f 77 73 20 74 68 65 |which allows the|
00012890 20 61 75 74 6f 2d 74 75 6e 65 0a 74 6f 20 62 65 | auto-tune.to be|
000128a0 20 74 75 72 6e 65 64 20 6f 66 66 2e 20 4f 6e 20 | turned off. On |
000128b0 53 53 42 20 69 74 20 69 73 20 62 65 73 74 20 74 |SSB it is best t|
000128c0 6f 20 6c 65 61 76 65 20 74 68 65 20 61 75 74 6f |o leave the auto|
000128d0 2d 74 75 6e 65 20 6f 6e 20 61 74 20 61 6c 6c 20 |-tune on at all |
000128e0 74 69 6d 65 73 2e 0a 0a 54 68 65 20 61 75 74 6f |times...The auto|
000128f0 2d 74 75 6e 65 20 77 6f 72 6b 73 20 62 79 20 6d |-tune works by m|
00012900 65 61 73 75 72 69 6e 67 20 74 68 65 20 66 72 65 |easuring the fre|
00012910 71 75 65 6e 63 79 20 6f 66 20 74 68 65 20 6c 61 |quency of the la|
00012920 73 74 20 34 20 6f 72 20 38 20 6c 69 6e 65 20 73 |st 4 or 8 line s|
00012930 79 6e 63 0a 70 75 6c 73 65 73 20 61 6e 64 20 75 |ync.pulses and u|
00012940 73 69 6e 67 20 74 68 65 20 61 76 65 72 61 67 65 |sing the average|
00012950 20 76 61 6c 75 65 20 74 6f 20 61 70 70 6c 79 20 | value to apply |
00012960 61 20 63 6f 72 72 65 63 74 69 6f 6e 20 74 6f 20 |a correction to |
00012970 61 6c 6c 20 74 68 65 20 63 6f 6c 6f 75 72 0a 64 |all the colour.d|
00012980 65 63 6f 64 69 6e 67 20 70 72 6f 63 65 73 73 65 |ecoding processe|
00012990 73 2e 20 54 68 69 73 20 77 6f 72 6b 73 20 76 65 |s. This works ve|
000129a0 72 79 20 77 65 6c 6c 20 62 75 74 20 6f 62 76 69 |ry well but obvi|
000129b0 6f 75 73 6c 79 20 74 68 65 72 65 20 69 73 20 61 |ously there is a|
000129c0 20 64 65 6c 61 79 0a 62 65 74 77 65 65 6e 20 61 | delay.between a|
000129d0 20 66 72 65 71 75 65 6e 63 79 20 63 68 61 6e 67 | frequency chang|
000129e0 65 20 61 6e 64 20 74 68 65 20 61 70 70 72 6f 70 |e and the approp|
000129f0 72 69 61 74 65 20 63 6f 72 72 65 63 74 69 6f 6e |riate correction|
00012a00 20 62 65 69 6e 67 20 61 70 70 6c 69 65 64 2e 0a | being applied..|
00012a10 42 65 63 61 75 73 65 20 6f 66 20 74 68 69 73 2c |Because of this,|
00012a20 20 69 74 20 69 73 20 62 65 73 74 20 74 6f 20 6c | it is best to l|
00012a30 65 61 76 65 20 61 20 73 6d 61 6c 6c 20 74 75 6e |eave a small tun|
00012a40 69 6e 67 20 65 72 72 6f 72 20 75 6e 63 6f 72 72 |ing error uncorr|
00012a50 65 63 74 65 64 2c 0a 72 61 74 68 65 72 20 74 68 |ected,.rather th|
00012a60 61 6e 20 6d 61 6b 69 6e 67 20 6c 6f 74 73 20 6f |an making lots o|
00012a70 66 20 74 69 6e 79 20 56 46 4f 20 6f 72 20 52 49 |f tiny VFO or RI|
00012a80 54 20 61 64 6a 75 73 74 6d 65 6e 74 73 20 77 68 |T adjustments wh|
00012a90 69 6c 73 74 20 77 61 74 63 68 69 6e 67 20 74 68 |ilst watching th|
00012aa0 65 0a 74 75 6e 69 6e 67 20 69 6e 64 69 63 61 74 |e.tuning indicat|
00012ab0 6f 72 2e 20 41 73 20 6c 6f 6e 67 20 61 73 20 74 |or. As long as t|
00012ac0 68 65 20 74 75 6e 69 6e 67 20 69 6e 64 69 63 61 |he tuning indica|
00012ad0 74 6f 72 20 73 68 6f 77 73 20 74 68 61 74 20 74 |tor shows that t|
00012ae0 68 65 20 73 69 67 6e 61 6c 20 69 73 0a 77 69 74 |he signal is.wit|
00012af0 68 69 6e 20 70 6c 75 73 2d 6f 72 2d 6d 69 6e 75 |hin plus-or-minu|
00012b00 73 20 31 35 30 20 48 7a 20 6f 66 20 74 68 65 20 |s 150 Hz of the |
00012b10 6e 6f 6d 69 6e 61 6c 20 66 72 65 71 75 65 6e 63 |nominal frequenc|
00012b20 79 2c 20 74 68 65 20 61 75 74 6f 2d 74 75 6e 65 |y, the auto-tune|
00012b30 20 77 69 6c 6c 0a 65 6e 73 75 72 65 20 74 68 61 | will.ensure tha|
00012b40 74 20 74 68 65 20 70 69 63 74 75 72 65 20 69 73 |t the picture is|
00012b50 20 72 65 63 65 69 76 65 64 20 63 6f 72 72 65 63 | received correc|
00012b60 74 6c 79 20 61 6e 64 20 70 72 65 63 69 73 65 20 |tly and precise |
00012b70 74 75 6e 69 6e 67 20 77 69 6c 6c 20 73 65 72 76 |tuning will serv|
00012b80 65 0a 6e 6f 20 75 73 65 66 75 6c 20 70 75 72 70 |e.no useful purp|
00012b90 6f 73 65 2e 0a 0a 41 73 20 74 68 65 20 61 75 74 |ose...As the aut|
00012ba0 6f 2d 74 75 6e 65 20 66 65 61 74 75 72 65 20 72 |o-tune feature r|
00012bb0 65 6c 69 65 73 20 6f 6e 20 73 61 6d 70 6c 69 6e |elies on samplin|
00012bc0 67 20 74 68 65 20 6c 69 6e 65 20 73 79 6e 63 20 |g the line sync |
00012bd0 70 75 6c 73 65 73 2c 20 69 74 20 69 73 0a 69 6d |pulses, it is.im|
00012be0 70 6f 72 74 61 6e 74 20 6e 6f 74 20 74 6f 20 75 |portant not to u|
00012bf0 73 65 20 73 75 63 68 20 61 20 6e 61 72 72 6f 77 |se such a narrow|
00012c00 20 70 61 73 73 62 61 6e 64 20 74 68 61 74 20 74 | passband that t|
00012c10 68 65 79 20 62 65 63 6f 6d 65 20 61 74 74 65 6e |hey become atten|
00012c20 75 61 74 65 64 2e 20 49 66 0a 79 6f 75 20 6e 6f |uated. If.you no|
00012c30 72 6d 61 6c 6c 79 20 75 73 65 20 49 46 20 73 68 |rmally use IF sh|
00012c40 69 66 74 20 6f 72 20 70 61 73 73 62 61 6e 64 2d |ift or passband-|
00012c50 74 75 6e 69 6e 67 20 74 6f 20 72 65 73 74 72 69 |tuning to restri|
00012c60 63 74 20 4c 46 20 61 75 64 69 6f 0a 72 65 73 70 |ct LF audio.resp|
00012c70 6f 6e 73 65 20 2d 20 71 75 69 74 65 20 6c 69 6b |onse - quite lik|
00012c80 65 6c 79 20 6f 6e 20 48 46 20 53 53 42 20 2d 20 |ely on HF SSB - |
00012c90 79 6f 75 20 6d 61 79 20 6e 65 65 64 20 74 6f 20 |you may need to |
00012ca0 75 73 65 20 73 6c 69 67 68 74 6c 79 20 6c 65 73 |use slightly les|
00012cb0 73 20 74 68 61 6e 0a 6e 6f 72 6d 61 6c 20 74 6f |s than.normal to|
00012cc0 20 65 6e 73 75 72 65 20 74 68 61 74 20 74 68 65 | ensure that the|
00012cd0 20 50 44 20 6d 6f 64 65 20 73 79 6e 63 20 70 75 | PD mode sync pu|
00012ce0 6c 73 65 73 20 63 61 6e 20 62 65 20 73 61 6d 70 |lses can be samp|
00012cf0 6c 65 64 20 62 79 20 74 68 65 20 61 75 74 6f 2d |led by the auto-|
00012d00 0a 74 75 6e 65 20 73 6f 66 74 77 61 72 65 2e 0a |.tune software..|
00012d10 0a 49 74 20 69 73 20 61 6c 73 6f 20 69 6d 70 6f |.It is also impo|
00012d20 72 74 61 6e 74 20 6e 6f 74 20 74 6f 20 74 6f 6c |rtant not to tol|
00012d30 65 72 61 74 65 20 61 20 22 62 61 64 20 73 74 61 |erate a "bad sta|
00012d40 72 74 22 2c 20 61 73 20 74 68 69 73 20 6d 61 79 |rt", as this may|
00012d50 20 63 6f 6e 66 75 73 65 20 74 68 65 0a 61 75 74 | confuse the.aut|
00012d60 6f 2d 74 75 6e 65 20 66 65 61 74 75 72 65 2e 20 |o-tune feature. |
00012d70 41 20 62 61 64 20 73 74 61 72 74 20 77 69 6c 6c |A bad start will|
00012d80 20 62 65 20 65 61 73 79 20 74 6f 20 73 70 6f 74 | be easy to spot|
00012d90 20 69 6e 20 74 68 65 20 50 44 20 6d 6f 64 65 73 | in the PD modes|
00012da0 2c 20 61 73 20 61 0a 76 65 72 79 20 6f 62 76 69 |, as a.very obvi|
00012db0 6f 75 73 20 22 63 6f 6d 62 22 20 65 66 66 65 63 |ous "comb" effec|
00012dc0 74 20 77 69 6c 6c 20 62 65 20 73 65 65 6e 20 64 |t will be seen d|
00012dd0 6f 77 6e 20 74 68 65 20 6c 65 66 74 20 6f 72 20 |own the left or |
00012de0 72 69 67 68 74 20 65 64 67 65 73 20 6f 66 20 74 |right edges of t|
00012df0 68 65 0a 70 69 63 74 75 72 65 2e 20 41 20 73 6d |he.picture. A sm|
00012e00 61 6c 6c 20 61 6d 6f 75 6e 74 20 6f 66 20 74 68 |all amount of th|
00012e10 65 20 63 6f 6d 62 20 65 66 66 65 63 74 20 69 73 |e comb effect is|
00012e20 20 6e 6f 72 6d 61 6c 20 2d 20 73 61 79 20 75 70 | normal - say up|
00012e30 20 74 6f 20 33 20 6f 72 20 34 0a 70 69 78 65 6c | to 3 or 4.pixel|
00012e40 73 20 77 69 64 65 20 2d 20 62 75 74 20 61 6e 79 |s wide - but any|
00012e50 20 6d 6f 72 65 20 74 68 61 6e 20 74 68 69 73 20 | more than this |
00012e60 6d 61 79 20 69 6e 64 69 63 61 74 65 20 74 68 61 |may indicate tha|
00012e70 74 20 74 68 65 20 70 69 63 74 75 72 65 20 69 73 |t the picture is|
00012e80 0a 69 6e 63 6f 72 72 65 63 74 6c 79 20 70 6f 73 |.incorrectly pos|
00012e90 69 74 69 6f 6e 65 64 2e 20 54 68 65 20 63 75 72 |itioned. The cur|
00012ea0 65 20 2d 20 61 73 20 77 69 74 68 20 62 61 64 20 |e - as with bad |
00012eb0 73 74 61 72 74 73 20 69 6e 20 61 6c 6c 20 6f 74 |starts in all ot|
00012ec0 68 65 72 20 53 53 54 56 0a 6d 6f 64 65 73 20 2d |her SSTV.modes -|
00012ed0 20 69 73 20 73 69 6d 70 6c 79 20 74 6f 20 68 6f | is simply to ho|
00012ee0 6c 64 20 64 6f 77 6e 20 61 64 6a 75 73 74 20 28 |ld down adjust (|
00012ef0 74 68 65 20 72 69 67 68 74 20 6d 6f 75 73 65 20 |the right mouse |
00012f00 62 75 74 74 6f 6e 29 20 66 6f 72 20 61 20 73 65 |button) for a se|
00012f10 63 6f 6e 64 0a 6f 72 20 73 6f 20 61 6e 64 20 74 |cond.or so and t|
00012f20 68 65 6e 20 72 65 6c 65 61 73 65 20 69 74 2e 20 |hen release it. |
00012f30 54 68 69 73 20 63 61 75 73 65 73 20 61 20 72 65 |This causes a re|
00012f40 2d 73 79 6e 63 20 61 6e 64 20 74 68 65 20 70 69 |-sync and the pi|
00012f50 63 74 75 72 65 0a 70 6f 73 69 74 69 6f 6e 69 6e |cture.positionin|
00012f60 67 20 73 68 6f 75 6c 64 20 69 6d 70 72 6f 76 65 |g should improve|
00012f70 2e 20 46 6f 72 74 75 6e 61 74 65 6c 79 2c 20 74 |. Fortunately, t|
00012f80 68 65 20 6c 6f 6e 67 20 6c 69 6e 65 20 73 79 6e |he long line syn|
00012f90 63 20 70 75 6c 73 65 73 20 75 73 65 64 20 69 6e |c pulses used in|
00012fa0 0a 74 68 65 20 31 39 39 37 2d 73 70 65 63 20 50 |.the 1997-spec P|
00012fb0 44 20 6d 6f 64 65 73 20 73 68 6f 75 6c 64 20 6d |D modes should m|
00012fc0 61 6b 65 20 62 61 64 20 73 74 61 72 74 73 20 66 |ake bad starts f|
00012fd0 61 69 72 6c 79 20 72 61 72 65 2e 0a 0a 54 68 65 |airly rare...The|
00012fe0 20 50 44 31 32 30 2c 20 31 38 30 20 61 6e 64 20 | PD120, 180 and |
00012ff0 32 34 30 20 6d 6f 64 65 73 20 75 73 65 20 34 39 |240 modes use 49|
00013000 36 20 70 69 63 74 75 72 65 20 6c 69 6e 65 73 2c |6 picture lines,|
00013010 20 6c 65 61 76 69 6e 67 20 31 36 20 6c 69 6e 65 | leaving 16 line|
00013020 73 20 61 74 20 74 68 65 0a 74 6f 70 20 6f 66 20 |s at the.top of |
00013030 74 68 65 20 50 73 63 61 6e 20 64 69 73 70 6c 61 |the Pscan displa|
00013040 79 20 75 6e 75 73 65 64 2e 20 57 68 65 6e 20 72 |y unused. When r|
00013050 65 63 65 69 76 69 6e 67 20 69 6e 20 74 68 65 73 |eceiving in thes|
00013060 65 20 74 77 6f 20 6d 6f 64 65 73 2c 20 74 68 65 |e two modes, the|
00013070 20 74 6f 70 0a 31 36 20 6c 69 6e 65 73 20 77 69 | top.16 lines wi|
00013080 6c 6c 20 62 65 20 66 69 6c 6c 65 64 20 69 6e 20 |ll be filled in |
00013090 77 69 74 68 20 64 61 72 6b 20 67 72 65 79 20 61 |with dark grey a|
000130a0 6e 64 20 74 68 65 20 72 65 63 65 69 76 65 64 20 |nd the received |
000130b0 69 6d 61 67 65 20 77 69 6c 6c 20 74 68 65 6e 0a |image will then.|
000130c0 6f 63 63 75 70 79 20 74 68 65 20 72 65 73 74 20 |occupy the rest |
000130d0 6f 66 20 74 68 65 20 73 63 72 65 65 6e 2e 20 57 |of the screen. W|
000130e0 68 65 6e 20 73 65 6e 64 69 6e 67 20 69 6e 20 50 |hen sending in P|
000130f0 44 31 32 30 2c 20 31 38 30 20 6f 72 20 32 34 30 |D120, 180 or 240|
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00013130 20 67 72 65 79 20 28 77 68 69 63 68 20 69 73 20 | grey (which is |
00013140 6e 6f 74 20 74 72 61 6e 73 6d 69 74 74 65 64 29 |not transmitted)|
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00013190 20 74 68 65 20 6d 6f 64 65 20 62 65 69 6e 67 0a | the mode being.|
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000131f0 65 20 6f 6e 20 74 68 65 20 73 63 72 65 65 6e 20 |e on the screen |
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00013210 61 72 65 61 20 69 73 20 74 72 61 6e 73 6d 69 74 |area is transmit|
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000132e0 62 65 20 70 6f 73 69 74 69 6f 6e 65 64 20 61 70 |be positioned ap|
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00013320 20 61 20 62 6f 72 64 65 72 20 6f 66 20 67 72 65 | a border of gre|
00013330 79 20 6f 6e 20 61 6c 6c 20 73 69 64 65 73 2e 20 |y on all sides. |
00013340 54 6f 20 73 65 6e 64 20 61 0a 70 69 63 74 75 72 |To send a.pictur|
00013350 65 20 69 6e 20 50 44 31 36 30 2c 20 61 6e 79 20 |e in PD160, any |
00013360 35 31 32 20 78 20 33 38 34 20 61 72 65 61 20 6f |512 x 384 area o|
00013370 66 20 74 68 65 20 73 63 72 65 65 6e 20 63 61 6e |f the screen can|
00013380 20 62 65 20 63 68 6f 73 65 6e 20 75 73 69 6e 67 | be chosen using|
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000133b0 72 20 69 73 20 61 63 74 69 76 61 74 65 64 20 77 |r is activated w|
000133c0 68 65 6e 20 74 68 65 20 54 20 62 75 74 74 6f 6e |hen the T button|
000133d0 20 69 73 20 63 6c 69 63 6b 65 64 0a 61 6e 64 20 | is clicked.and |
000133e0 50 44 31 36 30 20 6d 6f 64 65 20 68 61 73 20 62 |PD160 mode has b|
000133f0 65 65 6e 20 63 68 6f 73 65 6e 20 66 72 6f 6d 20 |een chosen from |
00013400 74 68 65 20 6d 6f 64 65 20 73 65 6c 65 63 74 20 |the mode select |
00013410 6d 65 6e 75 2e 20 4d 6f 76 65 20 74 68 65 20 63 |menu. Move the c|
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00013430 69 72 65 64 20 70 6f 73 69 74 69 6f 6e 20 61 6e |ired position an|
00013440 64 20 63 6c 69 63 6b 20 73 65 6c 65 63 74 2e 20 |d click select. |
00013450 54 68 65 20 50 44 31 36 30 20 6d 6f 64 65 20 74 |The PD160 mode t|
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000134a0 67 20 74 68 65 20 70 69 63 74 75 72 65 2c 20 63 |g the picture, c|
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000134e0 6f 72 20 50 44 35 30 20 6d 6f 64 65 73 20 28 33 |or PD50 modes (3|
000134f0 32 30 20 78 20 32 35 36 29 20 63 61 6e 20 62 65 |20 x 256) can be|
00013500 20 73 61 76 65 64 20 69 6e 20 74 68 65 0a 73 70 | saved in the.sp|
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00013520 61 74 20 69 66 20 72 65 71 75 69 72 65 64 2e 20 |at if required. |
00013530 50 69 63 74 75 72 65 73 20 72 65 63 65 69 76 65 |Pictures receive|
00013540 64 20 69 6e 20 61 6e 79 20 6f 74 68 65 72 20 50 |d in any other P|
00013550 44 20 6d 6f 64 65 0a 73 68 6f 75 6c 64 20 62 65 |D mode.should be|
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00013580 65 73 20 6f 72 20 69 6e 20 36 34 30 20 78 20 35 |es or in 640 x 5|
00013590 31 32 20 4a 50 45 47 20 66 6f 72 6d 61 74 2e 0a |12 JPEG format..|
000135a0 57 68 65 6e 20 73 61 76 69 6e 67 20 70 69 63 74 |When saving pict|
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000135c0 20 50 44 31 36 30 20 6d 6f 64 65 20 74 68 65 20 | PD160 mode the |
000135d0 67 72 65 79 20 62 6f 72 64 65 72 20 77 69 6c 6c |grey border will|
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00013610 72 73 69 6f 6e 20 33 20 6f 66 20 74 68 65 20 50 |rsion 3 of the P|
00013620 43 2d 62 61 73 65 64 20 50 61 73 6f 6b 6f 6e 20 |C-based Pasokon |
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00013670 22 68 69 67 68 20 72 65 73 6f 6c 75 74 69 6f 6e |"high resolution|
00013680 22 20 53 53 54 56 20 6d 6f 64 65 73 2e 20 54 68 |" SSTV modes. Th|
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000136d0 65 20 4d 61 72 74 69 6e 20 31 20 6f 72 20 53 43 |e Martin 1 or SC|
000136e0 32 2d 0a 31 38 30 2e 20 54 68 65 20 33 20 6d 69 |2-.180. The 3 mi|
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00013700 65 64 20 73 69 6d 70 6c 79 20 50 33 20 2d 20 74 |ed simply P3 - t|
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00013740 6e 64 73 20 74 6f 20 73 6f 66 74 65 6e 20 70 69 |nds to soften pi|
00013750 63 74 75 72 65 73 20 73 6c 69 67 68 74 6c 79 2e |ctures slightly.|
00013760 20 48 6f 77 65 76 65 72 2c 20 74 68 65 20 35 20 | However, the 5 |
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00013780 65 73 2c 20 63 61 6c 6c 65 64 20 50 35 20 61 6e |es, called P5 an|
00013790 64 20 50 37 2c 20 67 69 76 65 20 72 65 73 75 6c |d P7, give resul|
000137a0 74 73 20 76 65 72 79 20 73 69 6d 69 6c 61 72 20 |ts very similar |
000137b0 74 6f 20 74 68 65 20 50 44 2d 31 38 30 20 61 6e |to the PD-180 an|
000137c0 64 0a 50 44 2d 32 34 30 20 6d 6f 64 65 73 20 72 |d.PD-240 modes r|
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00013830 75 73 74 20 6c 69 6b 65 20 50 44 2d 31 38 30 20 |ust like PD-180 |
00013840 61 6e 64 20 50 44 2d 32 34 30 2e 20 54 68 65 73 |and PD-240. Thes|
00013850 65 20 6d 6f 64 65 73 20 61 72 65 20 61 6c 73 6f |e modes are also|
00013860 20 61 76 61 69 6c 61 62 6c 65 20 69 6e 20 74 68 | available in th|
00013870 65 0a 57 69 6e 50 69 78 20 50 72 6f 20 70 72 6f |e.WinPix Pro pro|
00013880 67 72 61 6d 20 61 6e 64 20 74 68 65 20 63 75 74 |gram and the cut|
00013890 2d 64 6f 77 6e 20 50 61 73 6f 6b 6f 6e 20 73 79 |-down Pasokon sy|
000138a0 73 74 65 6d 73 2c 20 63 61 6c 6c 65 64 20 22 50 |stems, called "P|
000138b0 61 73 6f 6b 6f 6e 20 4c 69 74 65 22 0a 61 6e 64 |asokon Lite".and|
000138c0 20 22 45 5a 2d 53 53 54 56 22 2e 20 41 74 20 74 | "EZ-SSTV". At t|
000138d0 68 65 20 74 69 6d 65 20 6f 66 20 77 72 69 74 69 |he time of writi|
000138e0 6e 67 20 28 4a 61 6e 75 61 72 79 20 31 39 39 37 |ng (January 1997|
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00013910 20 70 72 6f 67 72 61 6d 73 20 28 4a 56 46 41 58 | programs (JVFAX|
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00013940 72 74 20 74 68 65 73 65 20 6d 6f 64 65 73 2e 0a |rt these modes..|
00013950 0a 0a 32 31 29 20 54 65 73 74 20 70 61 74 74 65 |..21) Test patte|
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00013b00 20 6f 66 20 67 72 65 79 73 63 61 6c 65 20 61 74 | of greyscale at|
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00013c20 20 70 72 6f 62 6c 65 6d 20 66 6f 72 20 6e 65 77 | problem for new|
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00013c90 64 20 69 6e 20 74 68 65 20 67 72 65 79 73 63 61 |d in the greysca|
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00013cf0 54 68 65 20 74 65 78 74 20 6d 75 73 74 20 62 65 |The text must be|
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00013d10 43 68 6f 69 63 65 73 20 77 69 6e 64 6f 77 20 61 |Choices window a|
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00013db0 74 65 78 74 20 63 61 6e 0a 62 65 20 75 73 65 64 |text can.be used|
00013dc0 3b 20 6d 61 6e 79 20 50 43 2d 62 61 73 65 64 20 |; many PC-based |
00013dd0 53 53 54 56 20 70 72 6f 67 72 61 6d 73 20 64 69 |SSTV programs di|
00013de0 73 70 6c 61 79 20 74 68 65 20 6f 70 65 72 61 74 |splay the operat|
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00013e50 66 6f 6c 6c 6f 77 20 74 68 61 74 20 74 72 65 6e |follow that tren|
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0001f130 65 20 54 6f 6f 6c 73 0a 61 6e 64 20 75 74 69 6c |e Tools.and util|
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0001f1b0 20 77 69 6c 6c 20 62 65 20 74 72 61 6e 73 6d 69 | will be transmi|
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0001f1e0 62 79 20 61 20 43 57 20 69 64 65 6e 74 2e 20 54 |by a CW ident. T|
0001f1f0 68 65 20 72 65 70 65 61 74 65 72 20 74 68 65 6e |he repeater then|
0001f200 20 72 65 76 65 72 74 73 20 74 6f 20 73 74 61 6e | reverts to stan|
0001f210 64 79 20 6d 6f 64 65 2c 0a 77 61 69 74 69 6e 67 |dy mode,.waiting|
0001f220 20 66 6f 72 20 61 20 31 37 35 30 20 48 7a 20 61 | for a 1750 Hz a|
0001f230 63 63 65 73 73 20 74 6f 6e 65 2e 0a 0a 54 68 65 |ccess tone...The|
0001f240 20 62 65 61 63 6f 6e 20 70 61 67 65 20 63 61 6e | beacon page can|
0001f250 20 61 6c 73 6f 20 62 65 20 64 69 73 70 6c 61 79 | also be display|
0001f260 65 64 20 62 79 20 63 6c 69 63 6b 69 6e 67 20 6f |ed by clicking o|
0001f270 6e 20 74 68 65 20 22 52 70 65 61 74 65 72 20 62 |n the "Rpeater b|
0001f280 65 61 63 6f 6e 0a 70 61 67 65 22 20 6f 70 74 69 |eacon.page" opti|
0001f290 6f 6e 20 69 6e 20 74 68 65 20 54 65 73 74 20 70 |on in the Test p|
0001f2a0 61 74 74 65 72 6e 73 20 6d 65 6e 75 2e 20 49 74 |atterns menu. It|
0001f2b0 20 63 61 6e 20 74 68 65 6e 20 62 65 20 74 72 61 | can then be tra|
0001f2c0 6e 73 6d 69 74 74 65 64 20 69 6e 20 61 6e 79 0a |nsmitted in any.|
0001f2d0 6f 66 20 74 68 65 20 61 76 61 69 6c 61 62 6c 65 |of the available|
0001f2e0 20 53 53 54 56 20 6f 72 20 46 41 58 20 6d 6f 64 | SSTV or FAX mod|
0001f2f0 65 73 2e 0a 0a 50 4c 45 41 53 45 20 4e 4f 54 45 |es...PLEASE NOTE|
0001f300 3a 20 4d 79 20 75 6e 64 65 72 73 74 61 6e 64 69 |: My understandi|
0001f310 6e 67 20 6f 66 20 74 68 65 20 6c 69 63 65 6e 73 |ng of the licens|
0001f320 65 20 63 6f 6e 64 69 74 69 6f 6e 73 20 69 73 20 |e conditions is |
0001f330 74 68 61 74 20 61 6e 20 53 53 54 56 0a 72 65 70 |that an SSTV.rep|
0001f340 65 61 74 65 72 20 69 73 20 6c 65 67 61 6c 20 61 |eater is legal a|
0001f350 73 20 6c 6f 6e 67 20 61 73 20 69 74 20 69 73 20 |s long as it is |
0001f360 6e 6f 74 20 6c 65 66 74 20 75 6e 61 74 74 65 6e |not left unatten|
0001f370 64 65 64 2e 20 55 6e 61 74 74 65 6e 64 65 64 0a |ded. Unattended.|
0001f380 6f 70 65 72 61 74 69 6f 6e 20 77 6f 75 6c 64 20 |operation would |
0001f390 70 72 6f 62 61 62 6c 79 20 73 74 69 6c 6c 20 62 |probably still b|
0001f3a0 65 20 69 6c 6c 65 67 61 6c 20 65 76 65 6e 20 66 |e illegal even f|
0001f3b0 6f 72 20 74 68 6f 73 65 20 77 68 6f 20 68 6f 6c |or those who hol|
0001f3c0 64 20 61 20 70 61 63 6b 65 74 0a 72 61 64 69 6f |d a packet.radio|
0001f3d0 20 4e 4f 56 20 28 4e 6f 74 69 63 65 20 6f 66 20 | NOV (Notice of |
0001f3e0 56 61 72 69 61 74 69 6f 6e 29 2e 20 54 68 69 73 |Variation). This|
0001f3f0 20 28 49 20 62 65 6c 69 65 76 65 29 20 61 6c 6c | (I believe) all|
0001f400 6f 77 73 20 75 6e 61 74 74 65 6e 64 65 64 0a 6f |ows unattended.o|
0001f410 70 65 72 61 74 69 6f 6e 2c 20 62 75 74 20 6f 6e |peration, but on|
0001f420 6c 79 20 66 6f 72 20 64 69 67 69 74 61 6c 20 6d |ly for digital m|
0001f430 6f 64 65 73 2c 20 77 68 69 63 68 20 6f 66 20 63 |odes, which of c|
0001f440 6f 75 72 73 65 20 53 53 54 56 20 69 73 20 6e 6f |ourse SSTV is no|
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0001f460 68 65 20 69 6e 64 69 76 69 64 75 61 6c 20 50 73 |he individual Ps|
0001f470 63 61 6e 20 75 73 65 72 20 74 6f 20 64 65 74 65 |can user to dete|
0001f480 72 6d 69 6e 65 20 74 68 65 20 6c 65 67 61 6c 6c |rmine the legall|
0001f490 69 74 79 20 6f 66 20 74 68 65 20 72 65 70 65 61 |ity of the repea|
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0001f4c0 65 6c 64 20 72 65 73 70 6f 6e 73 69 62 6c 65 20 |eld responsible |
0001f4d0 66 6f 72 20 61 6e 79 20 62 72 65 61 63 68 65 73 |for any breaches|
0001f4e0 20 6f 66 20 74 68 65 20 61 6d 61 74 65 75 72 0a | of the amateur.|
0001f4f0 72 61 64 69 6f 20 6c 69 63 65 6e 63 65 20 63 6f |radio licence co|
0001f500 6e 64 69 74 69 6f 6e 73 2e 0a 0a 50 6c 65 61 73 |nditions...Pleas|
0001f510 65 20 6c 65 74 20 6d 65 20 68 61 76 65 20 79 6f |e let me have yo|
0001f520 75 72 20 63 6f 6d 6d 65 6e 74 73 20 61 6e 64 20 |ur comments and |
0001f530 63 72 69 74 69 63 69 73 6d 73 20 6f 6e 20 74 68 |criticisms on th|
0001f540 65 20 53 53 54 56 20 72 65 70 65 61 74 65 72 0a |e SSTV repeater.|
0001f550 66 61 63 69 6c 69 74 79 2e 0a 0a 0a 33 34 29 20 |facility....34) |
0001f560 2a 2a 2a 20 4e 65 77 20 69 6e 20 76 65 72 73 69 |*** New in versi|
0001f570 6f 6e 20 33 2e 31 30 20 2a 2a 2a 0a 0a 54 68 69 |on 3.10 ***..Thi|
0001f580 73 20 63 68 61 70 74 65 72 20 64 65 73 63 72 69 |s chapter descri|
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0001f5e0 65 61 74 65 20 61 20 6e 65 77 20 64 69 72 65 63 |eate a new direc|
0001f5f0 74 6f 72 79 20 66 72 6f 6d 20 74 68 65 20 66 69 |tory from the fi|
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0001f620 6c 65 72 2d 73 63 72 65 65 6e 20 69 73 20 74 68 |ler-screen is th|
0001f630 65 20 6f 70 74 69 6f 6e 20 74 6f 20 73 61 76 65 |e option to save|
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0001f650 2c 20 73 75 63 68 20 61 73 0a 74 68 6f 73 65 20 |, such as.those |
0001f660 63 72 65 61 74 65 64 20 75 73 69 6e 67 20 74 68 |created using th|
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0001f6e0 65 64 2c 20 63 61 6e 0a 61 6c 73 6f 20 62 65 20 |ed, can.also be |
0001f6f0 73 61 76 65 64 2e 20 53 65 65 20 63 68 61 70 74 |saved. See chapt|
0001f700 65 72 20 33 31 20 66 6f 72 20 6d 6f 72 65 20 64 |er 31 for more d|
0001f710 65 74 61 69 6c 73 2e 0a 0a 4f 6e 2d 6c 69 6e 65 |etails...On-line|
0001f720 20 6d 61 6e 75 61 6c 20 6d 65 6d 6f 72 79 20 61 | manual memory a|
0001f730 6c 6c 6f 63 61 74 69 6f 6e 3a 0a 54 68 65 20 6d |llocation:.The m|
0001f740 65 6d 6f 72 79 20 72 65 71 75 69 72 65 64 20 66 |emory required f|
0001f750 6f 72 20 74 68 65 20 6f 6e 2d 6c 69 6e 65 20 6d |or the on-line m|
0001f760 61 6e 75 61 6c 20 69 73 20 6e 6f 77 20 6b 65 70 |anual is now kep|
0001f770 74 20 69 6e 20 61 20 73 65 70 61 72 61 74 65 20 |t in a separate |
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0001f790 72 69 74 65 20 6f 76 65 72 6c 61 79 20 6d 65 6d |rite overlay mem|
0001f7a0 6f 72 79 2e 20 49 6e 20 70 72 65 76 69 6f 75 73 |ory. In previous|
0001f7b0 20 76 65 72 73 69 6f 6e 73 20 6f 66 20 50 73 63 | versions of Psc|
0001f7c0 61 6e 20 61 20 73 68 61 72 65 64 20 61 72 65 61 |an a shared area|
0001f7d0 0a 77 61 73 20 75 73 65 64 2c 20 77 68 69 63 68 |.was used, which|
0001f7e0 20 72 65 73 75 6c 74 65 64 20 69 6e 20 74 68 65 | resulted in the|
0001f7f0 20 64 65 6c 65 74 69 6f 6e 20 6f 66 20 74 65 78 | deletion of tex|
0001f800 74 20 61 6e 64 2f 6f 72 20 73 70 72 69 74 65 73 |t and/or sprites|
0001f810 20 77 68 65 6e 20 74 68 65 0a 6d 61 6e 75 61 6c | when the.manual|
0001f820 20 77 61 73 20 61 63 63 65 73 73 65 64 20 66 72 | was accessed fr|
0001f830 6f 6d 20 77 69 74 68 69 6e 20 50 73 63 61 6e 2e |om within Pscan.|
0001f840 20 41 73 20 61 20 63 6f 6e 73 65 71 75 65 6e 63 | As a consequenc|
0001f850 65 20 6f 66 20 74 68 69 73 20 63 68 61 6e 67 65 |e of this change|
0001f860 2c 0a 50 73 63 61 6e 20 6e 6f 77 20 72 65 71 75 |,.Pscan now requ|
0001f870 69 72 65 73 20 61 72 6f 75 6e 64 20 31 36 34 6b |ires around 164k|
0001f880 20 6f 66 20 65 78 74 72 61 20 6d 65 6d 6f 72 79 | of extra memory|
0001f890 2c 20 62 75 74 20 77 69 74 68 20 6d 65 6d 6f 72 |, but with memor|
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0001f8b0 20 74 68 69 73 20 73 68 6f 75 6c 64 6e 27 74 20 | this shouldn't |
0001f8c0 62 65 20 61 20 70 72 6f 62 6c 65 6d 21 0a 0a 50 |be a problem!..P|
0001f8d0 44 20 35 30 20 6d 6f 64 65 20 69 6d 70 6c 65 6d |D 50 mode implem|
0001f8e0 65 6e 74 65 64 3a 0a 54 68 69 73 20 69 73 20 61 |ented:.This is a|
0001f8f0 20 6e 65 77 20 33 32 30 20 78 20 32 35 36 20 6d | new 320 x 256 m|
0001f900 6f 64 65 2e 20 49 74 20 67 69 76 65 73 20 73 6c |ode. It gives sl|
0001f910 69 67 68 74 6c 79 20 69 6e 66 65 72 69 6f 72 20 |ightly inferior |
0001f920 72 65 73 75 6c 74 73 20 74 6f 0a 4d 61 72 74 69 |results to.Marti|
0001f930 6e 20 31 20 6f 72 20 50 44 39 30 20 62 75 74 20 |n 1 or PD90 but |
0001f940 69 73 20 6d 75 63 68 20 71 75 69 63 6b 65 72 2e |is much quicker.|
0001f950 20 49 74 20 69 73 20 66 61 73 74 65 72 20 74 68 | It is faster th|
0001f960 61 6e 20 4d 61 72 74 69 6e 20 32 20 61 6e 64 20 |an Martin 2 and |
0001f970 67 69 76 65 73 0a 6d 75 63 68 20 62 65 74 74 65 |gives.much bette|
0001f980 72 20 70 69 63 74 75 72 65 20 71 75 61 6c 69 74 |r picture qualit|
0001f990 79 2e 20 49 74 20 63 6f 75 6c 64 20 62 65 20 75 |y. It could be u|
0001f9a0 73 65 66 75 6c 20 77 68 65 6e 20 61 20 22 71 75 |seful when a "qu|
0001f9b0 69 63 6b 20 70 69 63 74 75 72 65 22 20 69 73 0a |ick picture" is.|
0001f9c0 72 65 71 75 69 72 65 64 2c 20 70 6f 73 73 69 62 |required, possib|
0001f9d0 6c 79 20 66 6f 72 20 53 53 54 56 20 72 65 70 65 |ly for SSTV repe|
0001f9e0 61 74 65 72 20 75 73 65 2e 20 50 44 35 30 20 77 |ater use. PD50 w|
0001f9f0 69 6c 6c 20 62 65 20 61 76 61 69 6c 61 62 6c 65 |ill be available|
0001fa00 20 74 6f 20 57 69 6e 50 69 78 0a 50 72 6f 20 75 | to WinPix.Pro u|
0001fa10 73 65 72 73 20 73 6f 6f 6e 2e 0a 0a 52 65 67 69 |sers soon...Regi|
0001fa20 73 74 72 61 74 69 6f 6e 3a 0a 54 68 69 73 20 69 |stration:.This i|
0001fa30 73 20 6e 6f 77 20 64 6f 6e 65 20 76 69 61 20 61 |s now done via a|
0001fa40 20 50 49 4e 20 6e 75 6d 62 65 72 20 69 73 73 75 | PIN number issu|
0001fa50 65 64 20 74 6f 20 65 61 63 68 20 72 65 67 69 73 |ed to each regis|
0001fa60 74 65 72 65 64 20 75 73 65 72 2e 20 43 6c 69 63 |tered user. Clic|
0001fa70 6b 20 6f 6e 0a 74 68 65 20 22 52 65 67 69 73 74 |k on.the "Regist|
0001fa80 65 72 2e 2e 2e 22 20 6f 70 74 69 6f 6e 20 69 6e |er..." option in|
0001fa90 20 74 68 65 20 69 63 6f 6e 20 62 61 72 20 6d 65 | the icon bar me|
0001faa0 6e 75 20 61 6e 64 20 65 6e 74 65 72 20 79 6f 75 |nu and enter you|
0001fab0 72 20 63 61 6c 6c 73 69 67 6e 2c 20 50 49 4e 0a |r callsign, PIN.|
0001fac0 61 6e 64 20 6e 61 6d 65 2e 20 54 68 69 73 20 6e |and name. This n|
0001fad0 65 77 20 74 65 63 68 6e 69 71 75 65 20 77 69 6c |ew technique wil|
0001fae0 6c 20 62 65 20 61 20 67 72 65 61 74 20 74 69 6d |l be a great tim|
0001faf0 65 2d 73 61 76 65 72 20 66 6f 72 20 6d 65 2c 20 |e-saver for me, |
0001fb00 61 73 20 49 20 77 69 6c 6c 0a 6e 6f 20 6c 6f 6e |as I will.no lon|
0001fb10 67 65 72 20 68 61 76 65 20 74 6f 20 73 65 6e 64 |ger have to send|
0001fb20 20 63 75 73 74 6f 6d 69 73 65 64 20 54 58 20 63 | customised TX c|
0001fb30 6f 64 65 20 74 6f 20 65 61 63 68 20 72 65 67 69 |ode to each regi|
0001fb40 73 74 65 72 65 64 20 75 73 65 72 20 77 68 65 6e |stered user when|
0001fb50 20 49 0a 72 65 6c 65 61 73 65 20 61 20 6e 65 77 | I.release a new|
0001fb60 20 76 65 72 73 69 6f 6e 20 6f 66 20 50 73 63 61 | version of Psca|
0001fb70 6e 2e 20 53 65 65 20 63 68 61 70 74 65 72 20 34 |n. See chapter 4|
0001fb80 20 66 6f 72 20 61 20 6d 6f 72 65 20 69 6e 66 6f | for a more info|
0001fb90 72 6d 61 74 69 6f 6e 2e 0a 0a 0a 33 35 29 20 43 |rmation....35) C|
0001fba0 6f 6e 74 61 63 74 69 6e 67 20 74 68 65 20 61 75 |ontacting the au|
0001fbb0 74 68 6f 72 20 61 6e 64 20 72 65 67 69 73 74 72 |thor and registr|
0001fbc0 61 74 69 6f 6e 20 64 65 74 61 69 6c 73 0a 0a 20 |ation details.. |
0001fbd0 20 50 61 75 6c 20 54 75 72 6e 65 72 20 47 34 49 | Paul Turner G4I|
0001fbe0 4a 45 20 20 20 20 20 20 20 20 54 65 6c 65 70 68 |JE Teleph|
0001fbf0 6f 6e 65 20 3a 20 2b 34 34 20 28 30 29 31 32 37 |one : +44 (0)127|
0001fc00 39 20 37 33 34 34 38 32 20 28 68 6f 6d 65 29 0a |9 734482 (home).|
0001fc10 20 20 36 31 20 50 72 69 6d 6c 65 79 20 4c 61 6e | 61 Primley Lan|
0001fc20 65 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 |e |
0001fc30 20 20 20 20 20 20 20 2b 34 34 20 28 30 29 31 32 | +44 (0)12|
0001fc40 37 39 20 37 31 38 35 39 36 20 28 77 6f 72 6b 29 |79 718596 (work)|
0001fc50 0a 20 20 53 68 65 65 72 69 6e 67 20 20 20 20 20 |. Sheering |
0001fc60 20 20 20 20 20 20 20 20 20 20 20 20 20 20 20 65 | e|
0001fc70 2d 6d 61 69 6c 20 3a 20 50 61 75 6c 67 34 69 6a |-mail : Paulg4ij|
0001fc80 65 40 61 6f 6c 2e 63 6f 6d 0a 20 20 42 69 73 68 |e@aol.com. Bish|
0001fc90 6f 70 73 20 53 74 6f 72 74 66 6f 72 64 20 20 20 |ops Stortford |
0001fca0 20 20 20 20 20 20 20 77 65 62 73 69 74 65 20 3a | website :|
0001fcb0 20 68 74 74 70 3a 2f 2f 6d 65 6d 62 65 72 73 2e | http://members.|
0001fcc0 61 6f 6c 2e 63 6f 6d 2f 70 73 63 61 6e 73 73 74 |aol.com/pscansst|
0001fcd0 76 2f 0a 20 20 48 65 72 74 73 20 43 4d 32 32 20 |v/. Herts CM22 |
0001fce0 37 4e 48 20 20 20 20 20 20 20 20 50 61 63 6b 65 |7NH Packe|
0001fcf0 74 20 72 61 64 69 6f 20 3a 20 47 34 49 4a 45 20 |t radio : G4IJE |
0001fd00 40 20 47 42 37 44 41 41 2e 23 33 33 2e 47 42 52 |@ GB7DAA.#33.GBR|
0001fd10 2e 45 55 0a 0a 54 6f 20 72 65 67 69 73 74 65 72 |.EU..To register|
0001fd20 20 50 73 63 61 6e 2c 20 70 6c 65 61 73 65 20 73 | Pscan, please s|
0001fd30 65 6e 64 20 a3 31 35 2e 30 30 20 74 6f 20 50 61 |end .15.00 to Pa|
0001fd40 75 6c 20 54 75 72 6e 65 72 20 61 74 20 74 68 65 |ul Turner at the|
0001fd50 20 61 64 64 72 65 73 73 20 61 62 6f 76 65 2e 0a | address above..|
0001fd60 41 73 20 74 68 65 20 61 6d 6f 75 6e 74 20 69 73 |As the amount is|
0001fd70 20 73 6d 61 6c 6c 2c 20 63 61 73 68 20 73 68 6f | small, cash sho|
0001fd80 75 6c 64 20 62 65 20 73 61 66 65 20 65 6e 6f 75 |uld be safe enou|
0001fd90 67 68 20 69 6e 20 74 68 65 20 70 6f 73 74 2c 20 |gh in the post, |
0001fda0 61 6c 74 68 6f 75 67 68 20 61 0a 63 68 65 71 75 |although a.chequ|
0001fdb0 65 20 69 73 20 61 6c 73 6f 20 71 75 69 74 65 20 |e is also quite |
0001fdc0 61 63 63 65 70 74 61 62 6c 65 2e 20 52 65 67 69 |acceptable. Regi|
0001fdd0 73 74 65 72 65 64 20 75 73 65 72 73 20 61 72 65 |stered users are|
0001fde0 20 73 65 6e 74 20 61 20 75 6e 69 71 75 65 20 50 | sent a unique P|
0001fdf0 49 4e 0a 6e 75 6d 62 65 72 20 77 68 69 63 68 20 |IN.number which |
0001fe00 61 6c 6c 6f 77 73 20 74 68 65 6d 20 74 6f 20 65 |allows them to e|
0001fe10 6e 63 6f 64 65 20 74 68 65 69 72 20 63 61 6c 6c |ncode their call|
0001fe20 73 69 67 6e 20 69 6e 74 6f 20 50 73 63 61 6e 20 |sign into Pscan |
0001fe30 66 6f 72 20 54 58 20 75 73 65 2e 0a 0a 4e 6f 77 |for TX use...Now|
0001fe40 20 74 68 61 74 20 74 68 65 20 6d 6f 73 74 20 75 | that the most u|
0001fe50 70 2d 74 6f 2d 64 61 74 65 20 76 65 72 73 69 6f |p-to-date versio|
0001fe60 6e 20 6f 66 20 50 73 63 61 6e 20 69 73 20 61 76 |n of Pscan is av|
0001fe70 61 69 6c 61 62 6c 65 20 66 72 6f 6d 20 6d 79 20 |ailable from my |
0001fe80 49 6e 74 65 72 6e 65 74 0a 77 65 62 73 69 74 65 |Internet.website|
0001fe90 2c 20 74 68 65 20 62 65 6e 65 66 69 74 73 20 6f |, the benefits o|
0001fea0 66 20 72 65 67 69 73 74 72 61 74 69 6f 6e 20 61 |f registration a|
0001feb0 72 65 20 70 72 6f 62 61 62 6c 79 20 6c 65 73 73 |re probably less|
0001fec0 20 74 68 61 6e 20 74 68 65 79 20 6f 6e 63 65 0a | than they once.|
0001fed0 77 65 72 65 2e 20 49 20 66 75 6c 6c 79 20 61 63 |were. I fully ac|
0001fee0 63 65 70 74 20 74 68 69 73 20 62 75 74 20 68 6f |cept this but ho|
0001fef0 70 65 20 74 68 61 74 20 75 73 65 72 73 20 77 69 |pe that users wi|
0001ff00 6c 6c 20 73 74 69 6c 6c 20 63 6f 6e 73 69 64 65 |ll still conside|
0001ff10 72 0a 72 65 67 69 73 74 65 72 69 6e 67 20 74 68 |r.registering th|
0001ff20 65 20 70 72 6f 67 72 61 6d 2c 20 61 73 20 69 74 |e program, as it|
0001ff30 20 70 72 6f 76 69 64 65 73 20 65 6e 63 6f 75 72 | provides encour|
0001ff40 61 67 65 6d 65 6e 74 20 66 6f 72 20 6d 65 20 74 |agement for me t|
0001ff50 6f 20 63 6f 6e 74 69 6e 75 65 0a 64 65 76 65 6c |o continue.devel|
0001ff60 6f 70 6d 65 6e 74 20 77 6f 72 6b 2e 0a 0a 48 61 |opment work...Ha|
0001ff70 76 65 20 66 75 6e 20 77 69 74 68 20 50 73 63 61 |ve fun with Psca|
0001ff80 6e 20 61 6e 64 20 70 6c 65 61 73 65 20 6c 65 74 |n and please let|
0001ff90 20 6d 65 20 6b 6e 6f 77 20 68 6f 77 20 79 6f 75 | me know how you|
0001ffa0 20 67 65 74 20 6f 6e 2e 20 49 66 20 79 6f 75 20 | get on. If you |
0001ffb0 68 61 76 65 20 61 6e 79 0a 73 75 67 67 65 73 74 |have any.suggest|
0001ffc0 69 6f 6e 73 20 66 6f 72 20 63 68 61 6e 67 65 73 |ions for changes|
0001ffd0 20 6f 72 20 69 6d 70 72 6f 76 65 6d 65 6e 74 73 | or improvements|
0001ffe0 20 74 6f 20 74 68 65 20 73 6f 66 74 77 61 72 65 | to the software|
0001fff0 2c 20 49 20 77 69 6c 6c 20 62 65 20 76 65 72 79 |, I will be very|
00020000 0a 70 6c 65 61 73 65 64 20 74 6f 20 68 65 61 72 |.pleased to hear|
00020010 20 66 72 6f 6d 20 79 6f 75 2e 0a 0a 37 33 20 66 | from you...73 f|
00020020 72 6f 6d 20 50 61 75 6c 20 54 75 72 6e 65 72 2c |rom Paul Turner,|
00020030 20 47 34 49 4a 45 20 2d 20 32 35 74 68 20 4a 61 | G4IJE - 25th Ja|
00020040 6e 75 61 72 79 20 31 39 39 38 0a bb bb 0a |nuary 1998....|
0002004e 
.