[GreenKeys] Another non-standard RTTY terminal

[Chris Elmquist]

Super cool.  I have half a dozen Silent 700 in the collection here including
a model 787 which is the beast that goes 120 CPS.  It's physically thicker
than the other models "white" models of the previous era.

I've also got couple 725s which were the "portable" ones the size of a very
large suitcase.

What were you using for a TU / connection to the radio?

73, Chris NØJCF

On Thursday (11/20/2025 at 06:51PM -0700), Harold Hallikainen via GreenKeys wrote:
> Very good! I did remember correctly that it is a thermal printer.
> According to Wikipedia, it uses thermal paper. I think I remember some
> thermal printers that had a ribbon and were a "thermal transfer" type of
> printer resulting in lower paper cost. The Silent 700 series cost about
> $2k back then.
> 
> In the Wikipedia article (https://en.wikipedia.org/wiki/Silent_700 ) about
> the Silent 700, it says that they had trouble getting it up to 120 cps
> when 1200 bps modems became popular ("the Silent 700 faced the problem
> that its printhead technology simply couldn't "heat up all the little
> dots" at 120 characters per second."). The solution was to double the
> number of heating elements so each section still worked at 60 cps.
> 
> I am still amazed at how fast thermal inkjet printers can print. And those
> thermal point of sale terminals that print a several foot receipt in a
> second or two are pretty amazing.
> 
> Finally, I asked Google about a Baudot version of the Silent 700:
> 
> Yes, a Baudot version of the Silent 700 was produced.
> 
> The Texas Instruments Silent 700 line of data terminals included specific
> models designed to use the 5-level Baudot code (also known as CCITT code),
> primarily for compatibility with existing teleprinter networks.
> 
> Key Baudot models included:
> 
> Model 732 Available in Keyboard Send/Receive (KSR), Receive Only (RO), and
> Automatic Send/Receive (ASR) configurations, the latter featuring
> integrated dual magnetic tape cassettes.
> 
> Model 751 This model used a serial current-loop interface and was
> specifically designed for communications terminal applications using
> Baudot/CCITT code.
> These Baudot models were introduced alongside their US-ASCII counterparts,
> such as the Model 733 and other various models, offering users a choice of
> character codes and interfaces to suit their specific application needs.
> The Silent 700 series was notable for its quiet thermal printing, which
> was a significant improvement over the noisy mechanical teletypes it often
> replaced.
> 
> Harold
> https://w6iwi.org
> 
> 
> On Thu, November 20, 2025 5:15 pm, William Wuttke wrote:
> > Curious Marc aroused my curiosity.
> > Here's my TI Silent 700 doing RTTY:
> >
> >
> > https://youtu.be/hELZ88KFBx0
> >
> >
> > 73,
> > Bill
> > KE3BK
> > ______________________________________________________________
> > GreenKeys mailing list
> > Home: http://mailman.qth.net/mailman/listinfo/greenkeys
> > Help: http://mailman.qth.net/mmfaq.htm
> > Post: mailto:GreenKeys at mailman.qth.net
> >
> >
> >>>> Jordan Spencer Cunningham's GreenKeys Search Tool:
> >>>> https://teletype.net/gksearch
> >>>> 2002-to-present greenkeys archive:
> >>>> http://mailman.qth.net/pipermail/greenkeys/
> >>>> 1998-to-2001 greenkeys archive:
> >>>> http://mailman.qth.net/archive/greenkeys/greenkeys.html
> >>>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool:
> >>>> http://comcents.com/tty/greenkeyssearch.html
> >>>>
> >
> > This list hosted by: http://www.qsl.net
> > Please help support this email list: http://www.qsl.net/donate.html
> > Message delivered to harold at w6iwi.org
> 
> 
> -- 
> Not sent from an iPhone.
> ______________________________________________________________
> GreenKeys mailing list
> Home: http://mailman.qth.net/mailman/listinfo/greenkeys
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:GreenKeys at mailman.qth.net
> 
> >>> Jordan Spencer Cunningham's GreenKeys Search Tool: https://teletype.net/gksearch
> >>> 2002-to-present greenkeys archive: http://mailman.qth.net/pipermail/greenkeys/
> >>> 1998-to-2001 greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html
> >>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool: http://comcents.com/tty/greenkeyssearch.html
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
> Message delivered to chrise at pobox.com

-- 
Chris Elmquist