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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 There are currently three streams available, with potential for a 110 baud/75 WPM stream in the future:

Stream NameURLBaud/WPM RateBit Length
ITTY Main - constant messages
45.45 baud / 60 WPM5
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.
45.45 baud / 60 WPM5
Greenwich - channel specific to Europe
50 baud / 66 WPM5

This is a very new setup by yours truly. Its purpose is not at all to replace 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. After each broadcast, usually the audio and video streams will be posted for download and future use:

Stream NameDateAudio URLVideo URL
Halloween Broadcast 2019 - The War of the Worlds2019-10-31
Santa Tracker 20192019-12-24TBDTBD
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