Radio Teletype (RTTY)
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| 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]
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Frequencies[edit]
Commercial and Maritime[edit]
- Deutscher Wetterdienst (German Weather Service) schedule (PDF)
- Station KPH's frequencies and schedule
Amateur Radio[edit]
Amateur RTTYRadio TeleTYpe radio bands can be found here.
Similar Modes[edit]
These modes sound like RTTYRadio TeleTYpe and can be mistaken for it.
- CIS-36-50
- CIS-50-50
- STANAG 4481 (FSKFrequency-Shift Keying mode)
- F03
- EFR_Teleswitch
- NAVTEX/SITOR-B (slightly)
- Russian Intelligence 200bd 1000Hz FSK (F06) (slightly)
This list is not complete. CISCommonwealth of Independent States (CIS), the former Soviet Republic-36-50, CISCommonwealth of Independent States (CIS), the former Soviet Republic-50-50 and F03 can't be decoded as RTTYRadio TeleTYpe and they are encrypted. STANAGNATO Standardization Agreement (STANAG), defines processes, procedures, terms, and conditions for common military or technical procedures or equipment between the member countries of the North Atlantic Treaty Organization (NATO).-4481 is normally encrypted but some stations transmit unencrypted idle sequences that decode as RTTYRadio TeleTYpe. EFR Teleswitch transmit only on three LW frequencies. NAVTEX and F06 are less similar to RTTYRadio TeleTYpe but can be mistaken if one is not careful.
Decoding Software[edit]
- Hobby Level Software
- CocoaModem (for Macs)
- Fldigi
- JVComm32
- MixW
- Mscan
- MultiMode (for Macs)
- MultiPSK
- SDRUno Baudot Plugin
- SeaTTY
- Sorcerer
- WinWarbler
- Professional Equipment/Software
- go2DECODE
- go2MONITOR
- Radiocom6
- Wavecom W-Code
- Wavecom W-Spectra
- WinRadio Universal FSK Decoder
- Zorns Lemma German
Video Examples[edit]
Additional Links[edit]
- Voice Frequency Telegraph (VFT)
- Radioteletype on Wikipedia
- Pinneberg RTTY Live at WebSDR Univ. of Twente
- W1AW digital transmissions
- RadioRaft BAUDOT
- Scancat info
- MultiPSK RTTY
Additional Images[edit]
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