[GreenKeys] iTTY and the Volpe USB Interface Board

[Paul Birkel]

Thanks Duncan.  Regarding "something to convert ...", I'm reminded of this
cartoon
(http://cafehayek.com/wp-content/uploads/2014/03/miracle_cartoon.jpg) with
the caption "I think you should be more specific here in step two" (which is
a box labeled "Then a Miracle Occurs") :->.

I think that your proposed approach is essence what Mike Douglas mentioned
in a thread ~2 weeks ago regarding his planning to include a demodulator
function in his project.

-----Original Message-----
From: greenkeys-bounces at mailman.qth.net
[mailto:greenkeys-bounces at mailman.qth.net] On Behalf Of Duncan Brown
Sent: Sunday, February 07, 2021 11:13 AM
To: greenkeys at mailman.qth.net
Subject: Re: [GreenKeys] iTTY and the Volpe USB Interface Board

Paul,

To connect to ITTY and send the signal to your M19, you do not need 
Fldigi, MMTTY, TTYBASH or a USB connection. You don't need any software.

ITTY is "steaming audio" in the form of a 5-bit AFSK TTY signal (like 
was used to be transmitted by radio).  You just need to be able to 
receive the audio (Browser on your computer) and then something to 
convert the two audio tones to an on/off DC signal and then maybe a 
level shifter to match the voltage/current of your M19 loop.

As Steve said, the Ver 1 Volpe board will do the interface between your 
computer audio and your M19 loop.

Good luck & Have fun,

Duncan
K2OEQ

On 07-Feb-21 06:38, Paul Birkel wrote:
>
> Now that my M19 is approaching a working state (currently fussing with 
> CAR RET bounce/settling and the dashpot)  I’d like to exercise it from 
> an iTTY feed.
>
> I have an assembled original (green PCB) Volpe USB interface board.
>
> Is ttyBash (https://teletype.net/display/TEL/ttyBash 
> <https://teletype.net/display/TEL/ttyBash>) coupled with fldigi 
> (http://www.w1hkj.com/ <http://www.w1hkj.com/>) the standard/only 
> software path to connect-the-dots?  Any alternatives that I should be 
> considering?
>
> Does anyone have any specific experience establishing a feed from iTTY 
> via the Volpe board that they can share?
>
> Thank you,
>
> paul
>
>
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>>> 2002-to-present greenkeys archive:
http://mailman.qth.net/pipermail/greenkeys/
>>> 1998-to-2001 greenkeys archive:
http://mailman.qth.net/archive/greenkeys/greenkeys.html
>>> Randy Guttery's 2001-to-2009 GreenKeys Search Tool:
http://comcents.com/tty/greenkeyssearch.html

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