[GreenKeys] iTTY and the Volpe USB Interface Board

[Steve Garrison]

As soon as I can get a board in my hands I'll let all of you know how they work out.

Steve G./N4TTY

-----Original Message-----
From: Eric <epvgk at limpoc.com> 
Sent: Monday, February 8, 2021 5:34 PM
To: N4TTY at ARRL.NET; Steve Garrison <steve.n4tty at gmail.com>; 'Paul Birkel' <pbirkel at gmail.com>
Cc: greenkeys at mailman.qth.net
Subject: RE: [GreenKeys] iTTY and the Volpe USB Interface Board

I'm curious if the 2211 chips from China work okay. I suppose at some point I'll need to redesign around some other part or just do it digitally but if there's a supply of 2211's still around we may as well keep using them.

On February 8, 2021 2:27:39 PM PST, Steve Garrison <steve.n4tty at gmail.com> wrote:
>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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