[GreenKeys] RTTY VS wire loops, Robot 800C

[Jeffrey Golas]

I have one of these too, thought it might be good for testing, etc.

Jeff

> On Dec 2, 2021, at 11:37 PM, Tom Hunter <tomhenryhunter at gmail.com> wrote:
> 
> 
> It seems some people are confusing RTTY with the old fashioned wire loops from when teletypes began replacing telegraph keys and sounders from city to city.
> 
> That is when FIGS-H motor controls and Blank-Blank keyboard lockouts on model 15's were useful. 
> 
> Obviously they are of no use on RTTY.
> 
> By the way, I just acquired a ROBOT 800C RTTY keyboard. In XMIT mode it will type directly to the TTY loop! The speed can be changed with a few keystrokes and it can generate a line of RY's or a FOX. I can see using it to test a lot of Teletypes. It requires an external loop supply. I had already built a 60 Volt, 60 mA  loop supply to avoid stressing the keying transistor too much. It drives my skintight 28 perfectly. It will also demodulate 170 Hz shift. I have used it on ITTY news. I have been recording things of my own on a $20 phone that I use as an MP3 player. 11025 and 8K bits per second (as ITTY uses) is fine and it beats the heck out of a cassette recorder.
> 
> The Robot needs to be used with a video monitor. I run it in to the analog input of an old LCD TV.
> 
> I also use that 60 Volt loop supply with my MFJ-1224 TU.
> 
> Tom   N3CRK
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