Sandbox:SITOR-A
SITOR-A is one of two modes of SITOR, which stands for Simplex Teletype Over Radio. Based on CCIR 476-4. It was formerly used to transmit maritime short messages, however the maritime industry is gradually moving away from using this mode in favor of PACTOR. AMTOR is a type of SITOR used by amateur radio operators.
SITOR-A has been seed with shifts of 170 Hz, 300 Hz, 400 Hz, and 850 Hz. SITOR-A is most commonly used with 170 Hz shift and 100 Bd.
Samples
| 100 Bd 170 Hz Shift |
|---|
<html5media>File:SITOR-A_Cairo_MFA_100_bd_170_Hz_shift_Jan_29_2016_9989.7kHz.mp3</html5media>  |
Frequencies
One of the biggest users of SITOR-A is not a maritime service - it's the Egyptian Embassy/MFA Cairo. The current version of the 2014 Digital Digest by Mike Chace-Ortiz (Spectrum Monitor editor) has an extensive description of this network. Also see the Utility DXers Forum on Groups.io for current frequency information
Video Examples
Decoding Software
- Hobby Level Software
- Professional Equipment/Software
- Go2decode
- Go2Monitor
- Hoka Code 3-32P
- Hoka 300-32
- Hoka 300-32P
- Krypto500
- Wavecom W-Code
- Wavecom W-Spectra
- WinRadio Universal FSK Decoder
Additional Links
- HF Digital "Tower of Babel"
- shoc Database: SITOR-A
- WAVECOM Database: SITOR-A
- Reading and Decoding the Transmissions of MFA Cairo (PDF) via UDXF website