Home » Archimedes archive » Acorn User » AU 1998-10.adf » Features » SSTV/!PSinstall/PscanFiles/Extras/Interfaces/!ReadMe

SSTV/!PSinstall/PscanFiles/Extras/Interfaces/!ReadMe

This website contains an archive of files for the Acorn Electron, BBC Micro, Acorn Archimedes, Commodore 16 and Commodore 64 computers, which Dominic Ford has rescued from his private collection of floppy disks and cassettes.

Some of these files were originally commercial releases in the 1980s and 1990s, but they are now widely available online. I assume that copyright over them is no longer being asserted. If you own the copyright and would like files to be removed, please contact me.

Tape/disk: Home » Archimedes archive » Acorn User » AU 1998-10.adf » Features
Filename: SSTV/!PSinstall/PscanFiles/Extras/Interfaces/!ReadMe
Read OK:
File size: 0265 bytes
Load address: 0000
Exec address: 0000
File contents
Pscan DrawFiles
***************

The HamComm DrawFile shows the simplest possible interface that can be used
for full transceive SSTV operation.

The PscanIF2 DrawFile is an improved version designed by G4IJE. This circuit is
strongly recommended for use with Pscan. See the main manual / help file for
more information on interfaces.

Both circuits include an open-collector PTT transistor. This can be used to
key most modern rigs directly, although a better approach is to use the
transistor to pull in a small relay which can be wired to give automatic
changeover from voice to SSTV.

*** G4IJE 06.04.96 ***
00000000  0a 50 73 63 61 6e 20 44  72 61 77 46 69 6c 65 73  |.Pscan DrawFiles|
00000010  0a 2a 2a 2a 2a 2a 2a 2a  2a 2a 2a 2a 2a 2a 2a 2a  |.***************|
00000020  0a 0a 54 68 65 20 48 61  6d 43 6f 6d 6d 20 44 72  |..The HamComm Dr|
00000030  61 77 46 69 6c 65 20 73  68 6f 77 73 20 74 68 65  |awFile shows the|
00000040  20 73 69 6d 70 6c 65 73  74 20 70 6f 73 73 69 62  | simplest possib|
00000050  6c 65 20 69 6e 74 65 72  66 61 63 65 20 74 68 61  |le interface tha|
00000060  74 20 63 61 6e 20 62 65  20 75 73 65 64 0a 66 6f  |t can be used.fo|
00000070  72 20 66 75 6c 6c 20 74  72 61 6e 73 63 65 69 76  |r full transceiv|
00000080  65 20 53 53 54 56 20 6f  70 65 72 61 74 69 6f 6e  |e SSTV operation|
00000090  2e 0a 0a 54 68 65 20 50  73 63 61 6e 49 46 32 20  |...The PscanIF2 |
000000a0  44 72 61 77 46 69 6c 65  20 69 73 20 61 6e 20 69  |DrawFile is an i|
000000b0  6d 70 72 6f 76 65 64 20  76 65 72 73 69 6f 6e 20  |mproved version |
000000c0  64 65 73 69 67 6e 65 64  20 62 79 20 47 34 49 4a  |designed by G4IJ|
000000d0  45 2e 20 54 68 69 73 20  63 69 72 63 75 69 74 20  |E. This circuit |
000000e0  69 73 0a 73 74 72 6f 6e  67 6c 79 20 72 65 63 6f  |is.strongly reco|
000000f0  6d 6d 65 6e 64 65 64 20  66 6f 72 20 75 73 65 20  |mmended for use |
00000100  77 69 74 68 20 50 73 63  61 6e 2e 20 53 65 65 20  |with Pscan. See |
00000110  74 68 65 20 6d 61 69 6e  20 6d 61 6e 75 61 6c 20  |the main manual |
00000120  2f 20 68 65 6c 70 20 66  69 6c 65 20 66 6f 72 0a  |/ help file for.|
00000130  6d 6f 72 65 20 69 6e 66  6f 72 6d 61 74 69 6f 6e  |more information|
00000140  20 6f 6e 20 69 6e 74 65  72 66 61 63 65 73 2e 0a  | on interfaces..|
00000150  0a 42 6f 74 68 20 63 69  72 63 75 69 74 73 20 69  |.Both circuits i|
00000160  6e 63 6c 75 64 65 20 61  6e 20 6f 70 65 6e 2d 63  |nclude an open-c|
00000170  6f 6c 6c 65 63 74 6f 72  20 50 54 54 20 74 72 61  |ollector PTT tra|
00000180  6e 73 69 73 74 6f 72 2e  20 54 68 69 73 20 63 61  |nsistor. This ca|
00000190  6e 20 62 65 20 75 73 65  64 20 74 6f 0a 6b 65 79  |n be used to.key|
000001a0  20 6d 6f 73 74 20 6d 6f  64 65 72 6e 20 72 69 67  | most modern rig|
000001b0  73 20 64 69 72 65 63 74  6c 79 2c 20 61 6c 74 68  |s directly, alth|
000001c0  6f 75 67 68 20 61 20 62  65 74 74 65 72 20 61 70  |ough a better ap|
000001d0  70 72 6f 61 63 68 20 69  73 20 74 6f 20 75 73 65  |proach is to use|
000001e0  20 74 68 65 0a 74 72 61  6e 73 69 73 74 6f 72 20  | the.transistor |
000001f0  74 6f 20 70 75 6c 6c 20  69 6e 20 61 20 73 6d 61  |to pull in a sma|
00000200  6c 6c 20 72 65 6c 61 79  20 77 68 69 63 68 20 63  |ll relay which c|
00000210  61 6e 20 62 65 20 77 69  72 65 64 20 74 6f 20 67  |an be wired to g|
00000220  69 76 65 20 61 75 74 6f  6d 61 74 69 63 0a 63 68  |ive automatic.ch|
00000230  61 6e 67 65 6f 76 65 72  20 66 72 6f 6d 20 76 6f  |angeover from vo|
00000240  69 63 65 20 74 6f 20 53  53 54 56 2e 0a 0a 2a 2a  |ice to SSTV...**|
00000250  2a 20 47 34 49 4a 45 20  30 36 2e 30 34 2e 39 36  |* G4IJE 06.04.96|
00000260  20 2a 2a 2a 0a                                    | ***.|
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