[GreenKeys] ITTY Poll

Thu Sep 23 15:40:28 EDT 2021

Uhh, your link says ITTY100 but it actually points to EUROPE!

Nick England K4NYW
www.navy-radio.com

On Thu, Sep 23, 2021 at 3:38 PM Paul Heller <paul0926 at comcast.net> wrote:

> That’s my experience as well Bill. I’m resetting back. Thanks for the
> report.
>
> Paul
> W2TTY
>
> ITTY: HTTP://INTERNET-TTY.NET:8000/ITTY
> <http://internet-tty.net:8000/ITTY>
> ITTY100: HTTP://INTERNET-TTY.NET:8010/ITTY100
> <http://internet-tty.net:8040/EUROPE>
> AUTOSTART: HTTP://INTERNET-TTY.NET:8030/AUTOSTART
> <http://internet-tty.net:8030/AUTOSTART>
> EUROPE: HTTP://INTERNET-TTY.NET:8040/EUROPE
> <http://internet-tty.net:8040/EUROPE>
>
> On Sep 23, 2021, at 1:35 PM, William Wuttke <wcwuttke at att.net> wrote:
>
> 
>
> Hi Paul,
>
> I can't decipher anything. It looks like the frequencies shifted down to
> around 1500-1600
> Hz, but can't tune the Dovetron to anything that is decipherable.
>
> Bill
> KE3BK
> On Thursday, September 23, 2021, 12:00:31 PM PDT, Paul Heller <
> paul0926 at comcast.net> wrote:
>
>
> I have just restarted ITTY100 streaming at the lower sampling rates.  Give
> it a few minutes to reboot and let me know what happens on your end.
>
> Paul
> W2TTY
> i-Telex: 80003 or 468466
>
> ITTY:   HTTP://INTERNET-TTY.NET:8000/ITTY
> <HTTP://internet-tty.net:8000/ITTY>
> ITTY100:   HTTP://INTERNET-TTY.NET:8010/ITTY100
> <HTTP://internet-tty.net:8010/ITTY100>
> AUTOSTART:  HTTP://INTERNET-TTY.NET:8030/AUTOSTART
> EUROPE:  HTTP://INTERNET-TTY.NET:8040/EUROPE
> <HTTP://internet-tty.net:8040/EUROPE>
>
>
> On Sep 23, 2021, at 12:46 PM, William Wuttke <wcwuttke at att.net> wrote:
>
> Paul,
>
> Give it a whirl. I'll tune to 100wpm.
>
> Bill
> KE3BK
> On Thursday, September 23, 2021, 09:58:15 AM PDT, Paul Heller <
> paul0926 at comcast.net> wrote:
>
>
> ITTY is sampling the audio at 11025Hz, 16 bits per sample, mono. When I
> tried going lower some said they were having trouble. I could easily try it
> again, but that’s where it stood a few years ago and I’ve not touched it
> since.
>
> 8 bit/8kHz would be an interesting test! I’m all for using less bandwith.
> Maybe I’ll try this on the 100WPM channel and let the users who are using
> it tell me how it goes. If anyone wants to be in on this test (100WPM) let
> me know and we will give it a whirl. If it works there, I can move the
> lower sampling over to the 60WPM channels.
>
> And if you all twist my arm, we can do the test on the 60WPM channel to
> start with.
>
> Paul
> W2TTY
>
> ITTY: HTTP://INTERNET-TTY.NET:8000/ITTY
> <http://internet-tty.net:8000/ITTY>
> AUTOSTART: HTTP://INTERNET-TTY.NET:8030/AUTOSTART
> <http://internet-tty.net:8030/AUTOSTART>
> EUROPE: HTTP://INTERNET-TTY.NET:8040/EUROPE
> <http://internet-tty.net:8040/EUROPE>
>
> On Sep 23, 2021, at 10:09 AM, Harold Hallikainen <harold at w6iwi.org> wrote:
>
> Methods of doing AFSK Internet broadcasts like ITTY are interesting. I
> thought the idea of splicing together mark and space tone files was very
> clever.
>
> I wonder about the need for audio compression. I did a microcontroller
> project that streamed live audio using ADPCM and PCM. The PCM used 16 bit
> samples at 44.41 kHz. But, I think for RTTY, 8 bit samples at 8 kHz should
> be fine (since that's what circuit switched telephone uses). In my
> application, on receiving the HTTP request, I sent the WAV header with a
> very large file size, then just started sending the samples.
>
> As mentioned, I do think the splicing of tone files is very clever!
> Another method that would be interesting is direct digital synthesis.
> Depending on the desired frequency, each successive sample would be some
> number of steps through a sine table from the previous sample.
>
> Anyway, interesting stuff!
>
> Harold
>
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