What is Radio Teletype (RTTY)?
RTTY (Also known as Baudot or ITA2) uses the Baudot 5-bit alphabet with FSK to send text messages over the shortwave.
This mode is gradually dying out in favor of more robust modes like PSK31 in the amateur service. Uses the ITA-2 alphabet (Commonly known as Baudot, derived from the Murray code).
Apart from occasional ham use, the only other known user is the Deutscher Wetterdienst (German Meteorological Service).
There are many modes that sound like Baudot, but in fact aren't. For example, the Russians use a 50 baud /200 Hz system that to the ear, sounds like Baudot.
Closer examination with tools for viewing waveforms and other data will show this clearly.
Among amateur radio, the most common default mode of RTTY is 170 Hz with 45.45Bd.
Pinneberg DWD Weather RTTY
|Frequency||Callsign||Broadcast Times||Tx Power||Baud||Shift|
|147.3 kHz||DDH 47||05.30 - 22.00 UTC||20 kW||50 Bd||85 Hz|
|11039 kHz||DDH 9||05.30 - 22.00 UTC||1 kW||50 Bd||450 Hz|
|14467.3 kHz||DDH 8||05.30 - 22.00 UTC||1 kW||50 Bd||450 Hz|
|4583 kHz||DDK 2||00.00 - 24.00 UTC||1 kW||50 Bd||225 Hz|
|7646 kHz||DDH 7||00.00 - 24.00 UTC||1 kW||50 Bd||450 Hz|
|10100.8 kHz||DDK 9||00.00 - 24.00 UTC||10 kW||50 Bd||450 Hz|
Amateur RTTY radio bands can be found here.
- Hobby Level Software
- dl-fldigi (Windows, Linux, Mac)
- CocoaModem (for Macs)
- MultiMode (for Macs)
- Professional Equipment/Software
- Wavecom W-Code
- Wavecom W-Spectra
- WinRadio Universal FSK Decoder
- Zorns Lemma German