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Category: What is RTTY?
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What is Radio Teletype (RTTY)?

 

 

Radio Teletype (RTTY)
RTTY thumbnail.jpg
Frequencies 147.3 kHz,3.57 MHz,4.583 MHz,5.3305 MHz,5.3465 MHz,5.357 MHz,5.3715 MHz,5.4035 MHz,7.04 MHz,7.08 MHz,7.125 MHz,7.646 MHz,11.039 MHz,14.07 MHz,14.4673 MHz,28.15 MHz,10.1008 MHz,10.13 MHz
Frequency Range 147.3 kHz - 28.15 MHz
Mode USB
Modulation FSK
ACF
Emission Designator
Bandwidth 85 Hz,170 Hz,450 Hz,850 Hz
Location Worldwide
Short Description 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.
I/Q Raw Recording
Audio Sample

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.

 

Contents

Click Here to Hear Pinneberg RTTY Live at WebSDR Univ. of Twente

Samples

RTTY 85Hz Shift
   
45.45 Bd

RTTY 85Hz 45.45Bd.jpg
50 Bd

RTTY 85Hz 50Bd.jpg
75 Bd

RTTY 85Hz 75Bd.jpg
100 Bd

RTTY 85Hz 100Bd.jpg



 

RTTY 170Hz Shift

 

   
45.45 Bd

RTTY 170Hz 45.45bd.jpg
50 Bd

RTTY 170Hz 50Bd.jpg
75 Bd

RTTY 170Hz 75Bd.jpg
100 Bd

RTTY 170Hz 100Bd.jpg



 

RTTY 450Hz Shift

 

   
45.45 Bd

RTTY 450Hz 45.45Bd.jpg
50 Bd

RTTY 450Hz 50Bd.jpg
75 Bd

RTTY 450Hz 75Bd.jpg
100 Bd

RTTY 450Hz 100Bd.jpg



 

RTTY 850Hz Shift

 

   
45.45 Bd

RTTY 850Hz 45.45Bd.jpg
50 Bd

RTTY 850Hz 50Bd.jpg
75 Bd

RTTY 850Hz 75Bd.jpg
100 Bd

RTTY 850Hz 100Bd.jpg

Frequencies

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 Radio

Amateur RTTY radio bands can be found here.

Decoding Software

Hobby Level Software

 

Professional Equipment/Software

Video Examples

Additional Links