[GreenKeys] Printer over the phone lines.

[Gregory W. Moore]

GE Rick,

I mean absolutely NO disrespect, nor mean to cast aspersions on your 
ideas, but the technology
for this has been in use in the USA for years as TDD.  I have a TDD 
modem, and use my model 28 frequently to communicate with my hearing 
impaired friends.....

I see no reason why we, as hams, couldn't use the same modem, as the 
speed is immaterial, as is the transmission protocol, as long as it is 
in mark/space format.   With the proper interface, any TNC or soundcard 
mode could be used, as long as the teleprinter (I'm being generic here) 
could
be interfaced with the mode, just the same as a computer is able to use 
a dialup connection...

I never thought of using it that way, but the idea is seriously intriguing..

73 es tnx de Greg "GW" Moore WA3IVX/NNN0BVN


Richard YOUL Brisbane wrote:

>To Jan Bogue,
>
>This has been my specialty for some years, and although the number of
>followers has been disappointing, the technology has been successful.
>
>With some assistance I have devised interfaces to go between teleprinters
>and modems, and these have been successfully used over phone lines for some
>years. Connecting a printer directly to the phone socket is sure to cause
>consternation at the phone exchange!
>
>I have circuits for both single current (neutral I think you call it) and
>double current (polar) teleprinters. With minor modifications they can be
>used for either RE232 modems which work on    +12v (space) and -12v for a
>mark. (Space is the equivalent of no current in the receive magnet
>and mark is when the magnet is pulled shut). Another type of modem is called
>TTL and it uses
>+5v for a space and zero volts for a mark. This latter is the type of modem
>I normally use.
>
>The single current interface has 3 transistors, some resistors, diodes and
>capacitors which you should find at Radio Shack type suppliers. If you are
>just OK with a soldering iron, constructing one should be possible in a
>couple of hours.
>
>The other requirement obviously is that the other person uses the same modem
>tones. For the 'old' 300 baud modems, there is the Bell standard and the
>CCITT (world standard) tones and they are not interchangeable, but some
>modems can be switched to whichever of the two is desired. I think the CCITT
>standard is called V24.
>
>You are obviously quite new to the wonderful world of teleprinters, and may
>feel put off by sometimes conflicting advice on what can and can't be done.
>I had no formal training with printers, but often not knowing what
>(officially) would not work, I did it anyway and often it did work. While
>loop voltages in excess of 100VDC are no doubt necessary for operation over
>lines many miles long, I have found that the Teletype Model 15 works quite
>well with a loop voltage as low as 30DC. The only disadvantage may be the
>need to more carefully adjust the Rangefinder.
>
>Anyway if nobody comes up with anything better, I would be happy to send
>circuits etc as you may require. Your newness to teleprinters is about the
>same as mine with E-Mail etc so for circuits etc it may be necessary to rely
>on the old snail mail.
>
>I did once work teleprinter to computer in New Zealand, but would be
>interested in trying a connection to the USA.
>
>                            ****************************************
>
>Somebody has devised a system whereby the Internet can be used for Morse
>Code working even using Morse Keys and sounders. Has anybody succeeded in
>doing the same for Teleprinters?
>
>
>_______________________________________________
>GreenKeys mailing list
>GreenKeys at mailman.qth.net
>http://mailman.qth.net/mailman/listinfo/greenkeys
>
>  
>


-- 

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Greg Moore NNN0BVN PA
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