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. There is more information at rtty.com. There are currently three streams available, with potential for a 110 baud/100 WPM stream in the future:
|Stream Name||URL||Baud/WPM Rate||Bit Length|
|ITTY Main - constant messages||http://internet-tty.net:8000/ITTY||45.45 baud / 60 WPM||5|
|ITTY Autostart - periodic messages throughout the day including email postings of GreenKeys. Should use an autostart functionality on your machine to avoid it running for hours.||http://internet-tty.net:8030/AUTOSTART||45.45 baud / 60 WPM||5|
|Greenwich - channel specific to Europe||http://internet-tty.net:8040/EUROPE||50 baud / 66 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 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 110 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||Audio URL||Video URL|
|Santa Tracker 2019||2019-12-24||TBD||TBD|
|Halloween Broadcast 2019 - The War of the Worlds||2019-10-31||https://nerdology.org/itty-audio/waroftheworlds_2019.mp3||-|
|RTTY Broadcast Test||2018-06-08||Same as video||https://youtu.be/dNjVA9ilpf8|
|RTTY Broadcast Test||2018-05-12||Same as video|