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

[Harold Hallikainen]

On Sun, October 4, 2026 9:30 am, Paul Newland, ad7i via GreenKeys wrote:

> Harold, W6IWI told how to just download a PCM wave file with the latest
> info from his news servers.  I'm guessing it would be possible to also
> post the text file for the content that was used to generate the WAV file,
> and bypass the modem part, although the modem tones playing softly in the
> shack as the printer runs is part of the ambiance of RTTY.
>

The news feeds are pulled from the sources (NPR, CNN, CSM) every couple
hours. The articles articles are reformatted to clean ASCII (including
word wrap). This is then converted to baudot with the msb set if the
character is in the figs set and clear if it is in the ltrs character set.
Currently the required figs and ltrs are inserted in the software uart
that drives the dds tone generator. I COULD move that conversion to
earlier so there is a ready to print baudot file.

As noted earlier, the audio is a large PCM audio file with 8 bits per
sample (unsigned) at 8,000 samples per second. latest.php sends a redirect
to the browser to point to the latest wav file. For NPR, there is
latestt.php, which is experimental. It directly returns the WAV file
instead of doing a redirect. Finally, the subdomain plaintext.w6iwi.org
allows for unencrypted transfers. Unencrypted PCM SHOULD make the client
software (an http client) pretty simple.

Harold
https://w6iwi.org




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