Radio Teletype (RTTY)

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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

RTTYRadio TeleTYpe (Also known as Baudot or ITA2) uses the Baudot 5-bit alphabet with FSKFrequency-Shift Keying 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 baudBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second. /200 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 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 RTTYRadio TeleTYpe is 170 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz). with 45.45Bd.

Samples[edit]

RTTYRadio TeleTYpe 85Hz Shift
45.45 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second.

RTTY 85Hz 45.45Bd.jpg
50 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second.

RTTY 85Hz 50Bd.jpg
75 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second.

RTTY 85Hz 75Bd.jpg
100 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second.

RTTY 85Hz 100Bd.jpg


RTTYRadio TeleTYpe 170Hz Shift

45.45 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second.

RTTY 170Hz 45.45bd.jpg
50 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second.

RTTY 170Hz 50Bd.jpg
75 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second.

RTTY 170Hz 75Bd.jpg
100 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second.

RTTY 170Hz 100Bd.jpg


RTTYRadio TeleTYpe 450Hz Shift

45.45 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second.

RTTY 450Hz 45.45Bd.jpg
50 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second.

RTTY 450Hz 50Bd.jpg
75 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second.

RTTY 450Hz 75Bd.jpg
100 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second.

RTTY 450Hz 100Bd.jpg


RTTYRadio TeleTYpe 850Hz Shift

45.45 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second.

RTTY 850Hz 45.45Bd.jpg
50 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second.

RTTY 850Hz 50Bd.jpg
75 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second.

RTTY 850Hz 75Bd.jpg
100 BdBaud (unit symbol Bd) is the unit for symbol rate or modulation rate in symbols per second.

RTTY 850Hz 100Bd.jpg

Frequencies[edit]

Commercial and Maritime[edit]


Amateur Radio[edit]

Amateur RTTYRadio TeleTYpe radio bands can be found here.

Decoding Software[edit]

Hobby Level Software


Professional Equipment/Software

Video Examples[edit]

Additional Links[edit]

Additional Images[edit]