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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, WB2TTY (originally run by George Hutchinson, W7TTY, up until 2017). More information at There are currently four streams available:

Stream NameURLBaud/WPM RateBit Length
ITTY Main - constant relay of messages submitted by users baud / 60 WPM5
ITTY Autostart - periodic messages submitted by users-- also includes GreenKeys mailing list messages baud / 60 WPM5
ITTY Greenwich - constant channel like above but specific to Europe both in submissions and baud rate baud / 66 WPM5
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 WPM5

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.

Each upcoming scheduled broadcast will be listed here with a link to the streaming URLs. After the broadcast, the recorded streams and raw textfiles will be posted here as well.

DateStream NameLength (full)Audio (full)Length (no test)Audio (no test)TextfileVideo
2021-12-23/24/25Santa Tracker 2021TBDTBD

2021-10-31Halloween 2021 - LunaticTBDTBD

2020-12-23/24/25Santa Tracker 2020

2020-10-31Halloween 2020 - I Am Legend07:32:27I Am Legend FULL03:32:11I Am Legend
2019-12-23/24/25Santa Tracker 201937:23:17

2019-10-31Halloween 2019 - The War of the Worlds03:46:51
2018-06-08RTTY Live Broadcast Test00:01:35Same as video
2018-05-12RTTY Live Broadcast Test00:06:25Same as video

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