[GreenKeys] iTTY and the Volpe USB Interface Board

[eric]

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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