Can you connect an XY scope to the scope outputs? That will show what is
coming out of the tone filters. The manual says the input only needs to be
10 mV, so I suspect the cellphone output is sufficient. The TRRS connector
used on cellphones is a bit different. Perhaps it is not wired correctly.
See
https://www.radioworld.com/columns-and-views/workbench/a-handy-reminder-about-trrs-wiring
for the wiring.

With the scope connected, you should see a pattern like that at
https://w6iwi.org/rtty/tu170/ where, typically, horizontal is mark, and
vertical is space (but that may be reversed).

Good luck!

Harold
https://w6iwi.org


On Fri, August 30, 2024 9:04 pm, Jomar Quilatan wrote:
> Hi all,
>
> Another newbie question I suppose...
>
> I've got my Model 26 hooked up to the FSK 500 and the "transmit" marks
and spaces are showing up well.  Otherwise, it stays in Mark mode - even
with the audio plugged in, the marks and spaces are not being picked up.
>
> I have the ITTY feed playing through a cell phone plugged directly in.
Is there a need to amplify the input signal for the TU to pick up the
frequencies, or should that direct plugging in suffice (of course, with
reasonable volume from the phone)?  Otherwise I'm inclined to think that
my
> TU is stuck in a "transmit" mode, even though it is configured to "receive"
> as per the documentation.
>
> Looking forward to your input - thanks in advance!
> Regards,
>
> (- the M26 and Teletype newbie)
>
> *Jomar (Joshua Martin) Quilatan*
> Mississauga (Toronto), Canada
> RA 0-8045
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>>> 1998-to-2001 greenkeys archive: http://mailman.qth.net/archive/greenkeys/greenkeys.html
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