[GreenKeys] iTTY and the Volpe USB Interface Board

[Eric]

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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