[GreenKeys] ITTY audio into TU

[Paul Heller]

I have used a mono 1/8” plug without any problems. 

Maybe try that. 


Paul
> On Aug 31, 2024, at 6:22 AM, Harold Hallikainen via GreenKeys <greenkeys at mailman.qth.net> wrote:
> 
> 
> 
> 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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