ITTY uses the same AFSK (audio frequency shift keying) technology that RTTY uses except that the audio is streamed over the internet instead of amateur radio bands. This requires a computer to receive the ITTY stream and something (usually a TU, or terminal unit) to demodulate and decode the audio tones and relay the signal to your teletype's current loop, RS232, or whatever interface.
ITTY Station in Arvada, Colorado
The first and only "official" ITTY station is currently set up in the Rocky Mountains of Colorado. It is run by Paul Heller, W2TTY, with assistance from Tom Tillson, WB2TTY (originally run by George Hutchinson, W7TTY, up until 2017). More information at rtty.com. There are currently four streams available:
|Stream Name||URL||Baud/WPM Rate||Bit Length|
|ITTY Main - constant relay of messages submitted by users||http://internet-tty.net:8000/ITTY||45 baud / 60 WPM||5|
|ITTY Autostart - periodic messages submitted by users-- also includes GreenKeys mailing list messages||http://internet-tty.net:8030/AUTOSTART||45 baud / 60 WPM||5|
|ITTY Greenwich - constant channel like above but specific to Europe both in submissions and baud rate||http://internet-tty.net:8040/EUROPE||50 baud / 66 WPM||5|
|ITTY 100 - constant relay of messages submitted by users like the Main stream but at 100 WPM; content sounds like it will be subject to change||75 baud/100 WPM||5|
This is a very new setup by yours truly. Its purpose is not at all to replace or compete with the "official" ITTY but to provide just another source of data to print. Instead of a channel constantly providing data, at this time there are only periodic, scheduled broadcasts for specific purposes. They are usually associated with holidays or are actual live broadcasts written in realtime from one of my machines. Often a video stream of a machine printing out the broadcast will be posted as well as an audio stream. At this time, broadcasts are only done at 45.45 baud, though I may run a second stream for higher baud machines if there is demand for this.
After each broadcast, usually the audio and video streams will be posted for download and future use:
|Stream Name||Date||Length||Audio URL||Video URL||Textfile URL|
|Santa Tracker 2019||2019-12-23/24/25||37:23:17||N/A|
|Halloween Broadcast 2019 - The War of the Worlds||2019-10-31||03:46:51||https://nerdology.org/itty-audio/waroftheworlds_2019.mp3||-||waroftheworlds_2019.zip|
|RTTY Live Broadcast Test||2018-06-08||00:01:35||Same as video||https://youtu.be/dNjVA9ilpf8||-|
|RTTY Live Broadcast Test||2018-05-12||00:06:25||Same as video||-|