[GreenKeys] M19 Current Loop Testing

[Harold Hallikainen]

I agree the TU-170 is good. I have one! There are also various other TUs
available. Perhaps someone on the list has one you could get (I'm working
on a microntroller-based DSP TU right now, but it's not ready for prime
time). You could also just get a loop supply and resistor. Mr. RTTY has
the supplies. Then you should be able to type on the keyboard and have the
printer print. Good local test! My info on the TU-170 and loop supplies at
https://w6iwi.org/rtty/ .

Good luck!

Harold

On Thu, March 17, 2022 5:38 pm, steve bennett via GreenKeys wrote:
>  Try one of these if you can find one.It's a RTTY modem. It will take
> audio from iTTY and produce the current loop signals.
> https://www.w6iwi.org/rtty/tu170/
>
> -Steve
>     On Thursday, March 17, 2022, 08:23:26 PM EDT, Matthew Wagner
> <mattwagner92597 at gmail.com> wrote:
>
>  Hi all,
> I'm relatively new here, but I've been working on my first restoration (an
> M19) and I'm pretty close to having it done. The only thing left to test
> out is the actual Tx/Rx loop circuits. 
> I'm not entirely sure where to start out looking for something to
> interface with the 60mA loop. Preferably RS232 or USB to make things
> easier. I want to eventually get it up on ITTY once everything's working
> properly. 
> If anyone has some pointers on some gear to start looking for, I'd
> appreciate some direction. 
> Much Appreciated,Matt
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