[GreenKeys] iTTY and the Volpe USB Interface Board

[Steve Garrison]

I always use Volpe Demod for one and Volpe USB for the other.  Some use Version 1 and Version 2, but I always think of different versions of the same board with maybe minor differences.

 

Steve G./N4TTY

 

P.S.  And I have helped Eric assemble a good number of the Demod boards in the past and will have a KiCad version soon.  I’ll probably leave the Version 1 intact but add an A, B, C, etc if I make minor changes.  First one will be Version 1A.

 

From: greenkeys-bounces at mailman.qth.net <greenkeys-bounces at mailman.qth.net> On Behalf Of eric
Sent: Monday, February 8, 2021 3:52 PM
To: Paul Birkel <pbirkel at gmail.com>
Cc: greenkeys at mailman.qth.net
Subject: Re: [GreenKeys] iTTY and the Volpe USB Interface Board

 

There are two different boards that people are calling the "Volpe board" which is probably my fault for not giving them actual names. 

The USB-interface one is meant for translating digital data on modern computers to/from teletype loops. 

The RTTY demodulator one is meant for demodulating an audio FSK stream (like ITTY) and keying a teletype loop from it.  With this one it's easy - play the ITTY stream on your computer, phone, or tablet, and connect the audio output to the board. 

The USB interface board is meant more for teletypes interacting with software running on computers. That said, it *is* sort of possible to do it by using software to demodulate the ITTY stream and feed the text output to the loop via the USB interface board. 

Someone here figured out the commandline for this a while back, but it needs to run on a Linux computer (might work in WSL - windows subsystem for linux - on Windows also, but I haven't tried). Also you need the right packages installed, ie lame, minimodem, and curl:

curl -N -s http://internet-tty.net:8000/ITTY | lame --decode --quiet --mp3input - - | minimodem rtty -i -a -q --rx-one -R 11025 -f - > /dev/ttyACM0

This is a total hack, though a very clever one, and it'd be a lot easier to use a hardware demodulator.

eric

On 2021-02-07 03:38, 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) coupled with fldigi (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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