[GreenKeys] Looking for Alternative Method of Receiving Internet Broadcast of TTY Modem Tones

Sat Oct 3 19:53:14 EDT 2026

Paul, lots of options.

1. Find an older Raz Pi with audio connector, perhaps a 3, so no USB 
dongle will be needed. Set it up headless to boot and auto login, auto 
start a shell script to link to ITTY or your other streaming source or 
mp3 afsk files.

2. Use your Pi internal bluetooth and a cheap $3 audio bluetooth module 
from amazon or ebay, etc., to get the audio to your TU wirelessly.

3. Use an old smartphone for the wireless internet connectivity and its 
bluetooth to connect as in 2. Few phones today have actual headphone 
jacks so bluetooth is the only way.

4. Purchase an mp3 player (android recommended) WITH WIFI and do same as 
in 2 and 3. You can store and stream afsk and add mp3s in the playlist.

5. Write a python script and write the keying to a gpio pin. Add a solid 
state switch to key your loop.

6. Others are out there...

Highly recommend the bluetooth as you can play way across the room 
without tripping on the cables. I use bluetooth at the museum for 
running files and W6IWI news feeds. You can stick you old phone or mp3 
player on a nearby shelf and let it run for hours. On 5bits.net are 
several test files.

73, John W1AN

On 03-Oct-26 19:11, Johannes Eggers via GreenKeys wrote:
> You got yourself a nice project there...
> 
> The only challenge I can immediately see (and it may not be a problem), 
> is that you're asking it to do a stream rather than a single download.  
> I think if the server is using HLS, that should be manageable.
> 
> Do you know the URL and format of the audio stream?
> 
> Where you could go REALLY fancy is this: Don't just stream it into the 
> ESP32 and output the audio, instead de-modulate and output a signal that 
> can feed straight into the  28RO
> 
> 
> 
> 
> 
> On Sat, Oct 3, 2026 at 10:51 AM Paul Newland, ad7i via GreenKeys 
> <greenkeys at mailman.qth.net <mailto:greenkeys at mailman.qth.net>> wrote:
> 
>     I'm looking for some help to fill in my knowledge gap(s), and see if
>     I can find a lower cost way of receiving internet broadcasts of TTY
>     tones.
> 
>     My current setup to drive my Model 28RO consists of a Raspberry Pi
>     3B which is connected to my home WiFi network.  Connected to the Pi
>     is a cheap ($3) USB sound card dongle. I run the Pi headless and
>     control the Pi from my primary W11 PC using VNC over my home
>     network.  In order to play TTY modem tones from the Pi, on the Pi I
>     open the Chrome web browser and connect to one of the various
>     internet TTY sources (ITTY, W6IWI, etc).  This brings up a small
>     window with audio player controls on the W11/VNC/Pi display
>     monitor.  I click the play button, adjust the Pi's speaker volume
>     output for max (because bigger is better) and the audio modem tones
>     appear at the headphone output of the attached USB Sound Card
>     dongle, which is connected to a HAL ST-5000 (and the 28RO).  And
>     with that setup complete I get modem tones for days and days, which
>     is just what I want.
> 
>     The problem is that Raspberry Pis have now become "unobtainium", at
>     least at a reasonable price.  Data Centers have sucked up all the
>     RAM mfg capacity so that RPi can't get ram at a reasonable price to
>     make more Pis.  So I'm now looking for alternatives to the Pi
>     (because I want to repurpose my now scarce R-Pi to something other
>     than internet RTTY).
> 
>     So, for potential alternatives, I note that the ESP32-S3 can connect
>     via WiFi to the internet.  It also supports a USB port that can be
>     configured as On The Go (OTG) which makes me think that it might
>     support a USB sound dongle.  The ESP32-S3 seems to have great
>     availability and is priced at less than $6 delivered to my front door.
> 
>     So my question to the TTY-Internet cognoscenti is: can the ESP32-S3
>     go out onto the internet, connect to an ITTY-like website, ask for
>     that website to send it packets of audio data that represent TTY
>     modem tones and have those tones be reproduced by the USB-sound
>     dongle?  In a perfect world I'd like to configure the ESP32-S3
>     so that every time it powers up it should go to that ITTY-like
>     website and cause modem tones to be generated by the sound dongle,
>     without any user intervention.  Does anyone know if this is possible
>     and if so can you provide me with any pointers that would help me to
>     implement this functionality.
> 
>     Thanks,
> 
>     Paul, ad7i
> 
> 
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