SITOR-B

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SITOR-A | SITOR-B

SITOR-B
SITORB.jpg
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]

Video Examples[edit]

Decoding Software[edit]

Hobby Level Software


Professional Equipment/Software

Additional Links[edit]

Additional Images[edit]