[GreenKeys] Can Anyone remember this TU/Modem?

[Larry DeSoto]

I have one sitting next to me.  It was very nearly the first piece of 
electronic equipment I ever built (circa 1965) and I copied a lot of RTTY on 
it.  My brother-in-law used it in Alaska for years while I was working out 
of the country.  I finally got it back from him a few years ago along with 
the CRT tuning unit I built to go with it.  I have it working again and when 
I get time to finish reworking a machine, I will put it back in service.

The kids are amazed at the glowing glass bottles in the back.

Larry - WA5MLH



----- Original Message ----- 
From: "Bruce Gentry" <ka2ivy at verizon.net>
To: <GreenKeys at mailman.qth.net>
Sent: Monday, September 26, 2011 8:41 PM
Subject: [GreenKeys] Can Anyone remember this TU/Modem?


>I posted a question about TUs some months ago, and no one was able to
> identify it. The unit in question was homebrew, but supposedly based on
> an established design. It was tube, from the mid 1960s, and supposedly
> one of the best at the time. The main physical feature I can recall was
> four or more neon lamps in the center of the front panel. The builder
> told me it had a timing  or regenerator circuit that would produce a
> stop pulse and prevent the printing of more than one bad character if a
> noise burst corrupted a character. He was quite proud of it, and it
> seemed to work very well. Does this sound familiar to anyone? The TU I
> built was the old W2PAT circuit using TV horizontal oscillator coils for
> the filters.   That was just about all I could scrape up money and parts
> to build in high school tenth  grade in 1967.  How many of you remember
> the very popular bare-bones oscillopscope circuit using an 884 gas
> filled triode for sweep generation? I got hold of one, and the 884 tube
> was missing. However, it was fine  for an RTTY tuning indicator because
> sweep was not needed for cross-trace display.
>
>    Bruce Gentry KA2IVY
>>
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