SITOR-B
SITOR-A | SITOR-B
 | |
|---|---|
| Frequencies | 3 MHz,30 MHz |
| Frequency Range | 3 MHz - 30 MHz |
| Mode | USB |
| Modulation | FSK |
| ACF | — |
| Emission Designator | — |
| Bandwidth | 350 Hz |
| Location | Worldwide |
| Short Description | SITOR-B is one of two modes of SITOR (Simplex Teletype Over Radio). |
| I/Q Raw Recording | — |
| Audio Sample | |
SITOR-B is one of two modes of SITOR (Simplex Teletype Over Radio). NAVTEX and AMTOR-FECForward Error Correction/AMTOR-B uses the SITOR-B protocol. Based on CCIRComité Consultatif International pour la Radio (Predecessor of the ITU-R) 625
This mode is often used in broadcasts of navigational and other warnings from maritime stations. However, not all broadcasts are in English - for example, Istanbul Radio broadcasts in Turkish, while Olympia Radio may broadcast in Greek. This can confuse newcomers to think that their decoder is malfunctioning. See the frequencies section below for a website that lists some of these stations.
In addition, the Czech intelligence services, as well as the Egyptian diplomatic service has been known to use this mode.
Compared to SITOR-A, SITOR-B doesn't use ARQAutomatic Repeat reQuestAutomatic Repeat Query. Instead, it uses FECForward Error Correction by sending each character twice during transmission.
Sample[edit]
You may use this to fine tune your decoder:
The output should be:
ryryryryryryryryryryryryryryryryryryryryry the quick brown fox jumps over the lazy dog 0 9 8 7 6 5 4 3 2 1 ryryryryryryryryryryryryryryryryryryryryry ZCZC UA69 132320 UTC JAN 12 MONDOLFO RADIO COASTAL WARNING 012/12 JAN 12 SOUTHERN ADRIATIC SEA - LECCE. DAY 13-14 JANUARY 2012 FROM 07.00 GMT TO 23.00 GMT, WILL CARRY OUT WEAPONS FIRING IN TORRE VENERIONE BOUNDED BY THE FOLLOWING POINTS: A) 40 25 31N - 18 15 30E B) 40 30 20N - 18 16 30E C) 40 29 25N - 18 19 03E D) 40 27 45N - 18 20 58E E) 40 25 55N - 18 22 28E F) 40 23 05N - 18 23 18E G) 40 23 54N - 18 17 30E. SAILING, ANCHORAGE AND FISHING ARE PROHIBITED. NNNN ryryryryryryryryryryryryryryryryryryryryry
Frequencies[edit]
- USCG Marine Broadcasts Note: Select the USCG HFHigh Frequency (3-30 MHz) SITOR link
- Worldwide HF Radio-Telex Broadcasts by William Hepburn
- Worldwide NAVTEX broadcasts by William Hepburn
- Go to the very bottom of this page for additional links
Video Examples[edit]
Decoding Software[edit]
- Hobby Level Software
- Black Cat Android NAVTEX
- Black Cat NAVTEX decoder IPhone, IPad
- CocoaModem (for Macs)
- DroidNavtex
- MultiMode (for Macs)
- DSC Decoder
- Fldigi
- Frisnit
- JNX
- MultiPSK
- SDRUno NAVTEX Plugin
- SeaTTY
- Sigmira
- Sorcerer
- TrueTTY
- Yet Another NAVTEX Decoder (YAND) Scroll down to Downloads
- Professional Equipment/Software
- go2decode (Procitec)
- Hoka 300-32
- Krypto500
- Wavecom W-Code
- Wavecom W-Spectra
- WinRadio Advanced Digital Suite
- WinRadio Universal FSK Decoder
- Zorns Lemma German
- Rohde&Schwarz CA100
