[GreenKeys] ITTY audio into TU

[Jomar Quilatan]

Thanks to all who have replied - I did a quick test plugging audio in from
my computer instead (just treating the plug as mono) and lo and behold, I'm
receiving copy!  Definitely a phone cable thing that I was improperly
wiring (I also think my computer as a source will be more reliable compared
to my phone haha.)  The whirring sounds of receiving hard copy are simply
amazing!

Eventually I'll clean up my connections (and boost my loop voltage -
starting with 12V but will try the DC-DC boost or work up to a heavy-duty
supply).  Oh, and improvise the moving paper roll.
Now, on to ordering suitable teletype paper...

Regards,

*Jomar (Joshua Martin) Quilatan*


On Sat, Aug 31, 2024 at 12:22 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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> >
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> >>> 2002-to-present greenkeys archive:
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> >>> 1998-to-2001 greenkeys archive:
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>
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