SITOR-B

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SITOR-A | SITOR-B
SITOR-B
SITORB.jpg
Frequencies 3MHz3,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
3,000 kHzKiloHertz (kHz) 10^3 Hz
,30MHz30,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
30,000 kHzKiloHertz (kHz) 10^3 Hz
3,000 kHzKiloHertz (kHz) 10^3 Hz
MHzMegaHertz (MHz) 10^6 Hz
30,000 kHzKiloHertz (kHz) 10^3 Hz
30 MHzMegaHertz (MHz) 10^6 Hz
Frequency Range MHzMegaHertz (MHz) 10^6 Hz3,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
3,000 kHzKiloHertz (kHz) 10^3 Hz
- 30 MHzMegaHertz (MHz) 10^6 Hz30,000,000 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).
30,000 kHzKiloHertz (kHz) 10^3 Hz
Mode USBUpper Side Band Modulation (Radio, referring to reception and modulation mode)Universal Serial Bus (Computer, referring to USB Ports and cables)
Modulation FSKFrequency-Shift Keying
ACF
Bandwidth 350 HzHertz (Hz), unit of frequency, defined as one cycle per second (1 Hz).0.35 kHzKiloHertz (kHz) 10^3 Hz
3.5e-4 MHzMegaHertz (MHz) 10^6 Hz
0.35 kHzKiloHertz (kHz) 10^3 Hz
3.5e-4 MHzMegaHertz (MHz) 10^6 Hz
0.35 kHzKiloHertz (kHz) 10^3 Hz
3.5e-4 MHzMegaHertz (MHz) 10^6 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 (Automatic Repeat Request). Instead, it uses FECForward Error Correction (Forward 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]

Video Examples[edit]

Decoding Software[edit]

Hobby Level Software


Professional Equipment/Software

Additional Links[edit]

Additional Images[edit]