Maritime SITOR Traffic 8414.5 USB 0134 UTC 05 OCT 2023

[~SIGINT~]

01:34 UTC - Good copy on multiple shore and ship stations transmitting SITOR-B traffic on DSC distress/safety frequency.

TIME: 2023-10-05 01:34:40 FREQ: 8414.5 DIST: 5563 Km
SYMB: 120 120 044 001 014 000 000 108 000 022 041 002 020 118 126 126 126 126 126 126 126 122 108 ~~~ ~~~
 FMT: SEL
 CAT: SAF
  TO: SHIP,440114000,ASIAN EMPIRE,D7ML,Cargo
FROM: COAST,002241022,E,Coruna Radio
 TC1: TEST
 TC2: NOINF
FREQ: --
 POS: --
 EOS: ACK
cECC: 108 OK

TIME: 2023-10-05 01:36:29 FREQ: 8414.5 DIST: 5563 Km
SYMB: 120 120 044 001 014 000 000 108 000 022 041 002 020 118 126 126 126 126 126 126 126 122 108 122 122
 FMT: SEL
 CAT: SAF
  TO: SHIP,440114000,ASIAN EMPIRE,D7ML,Cargo
FROM: COAST,002241022,E,Coruna Radio
 TC1: TEST
 TC2: NOINF
FREQ: --
 POS: --
 EOS: ACK
cECC: 108 OK

TIME: 2023-10-05 01:37:57 FREQ: 8414.5 DIST: -- Km
SYMB: 120 120 000 022 040 099 020 108 031 010 000 045 010 118 126 126 126 126 126 126 126 117 018 117 117
 FMT: SEL
 CAT: SAF
  TO: COAST,002240992,E,MRSC Coruna
FROM: SHIP,311000451,SYDNEY SPIRIT,C6CE7,Tanker
 TC1: TEST
 TC2: NOINF
FREQ: --
 POS: --
 EOS: REQ
cECC: 18 OK

TIME: 2023-10-05 01:38:32 FREQ: 8414.5 DIST: -- Km
SYMB: 120 120 000 036 060 000 030 111 063 060 018 084 020 106 024 126 126 ~~~ 126 126 126 117 071 117 117
 FMT: SEL
 CAT: UNK
  TO: COAST,003660003,USA,ShipCom WLO
FROM: SHIP,636018842,DEVELOPMENT DRILLER3,D5RQ4,Other
 TC1: DATA
 TC2: UNK/ERR
FREQ: --
 POS: --
 EOS: REQ
cECC: 57 ERR

TIME: 2023-10-05 01:39:14 FREQ: 8414.5 DIST: 7985 Km
SYMB: 120 120 021 057 006 000 000 108 000 023 071 000 000 118 126 004 012 050 004 012 050 122 028 ~~~ 122
 FMT: SEL
 CAT: SAF
  TO: SHIP,215706000,BESIKTAS AZERBAIJAN,9HA525,N/A
FROM: COAST,002371000,GRC,Olympia Radio
 TC1: TEST
 TC2: NOINF
FREQ: --
 POS: --
 EOS: ACK
cECC: 28 OK

TIME: 2023-10-05 01:42:35 FREQ: 8414.5 DIST: -- Km
SYMB: 120 120 000 036 060 000 030 111 063 060 018 084 020 106 024 126 126 126 126 126 126 117 071 117 117
 FMT: SEL
 CAT: UNK
  TO: COAST,003660003,USA,ShipCom WLO
FROM: SHIP,636018842,DEVELOPMENT DRILLER3,D5RQ4,Other
 TC1: DATA
 TC2: UNK/ERR
FREQ: --
 POS: --
 EOS: REQ
cECC: 71 OK

TIME: 2023-10-05 01:43:27 FREQ: 8414.5 DIST: -- Km
SYMB: 120 ~~~ 000 071 ~~~ 000 020 108 024 017 016 000 000 ~~~ ~~~ 126 ~~~ ~~~ 126 ~~~ ~~~ ~~~ ~~~ ~~~ ~~~
 FMT: SEL
 CAT: SAF
  TO: COAST,0071~~002, UNID
FROM: SHIP,241716000,ACHILLEAS,SVDI2,Tanker
 TC1: UNK/ERR
 TC2: UNK/ERR
FREQ: --
 POS: --
 EOS: ~~~
cECC: 94 ERR

TIME: 2023-10-05 01:46:26 FREQ: 8414.5 DIST: -- Km
SYMB: 120 ~~~ ~~~ ~~~ 041 ~~~ ~~~ ~~~ ~~~ ~~~ ~~~ 076 ~~~ ~~~ ~~~ ~~~ ~~~ ~~~ ~~~ ~~~ ~~~ ~~~ ~~~ ~~~ ~~~
 FMT: SEL
 CAT: UNK
  TO: SHIP,~~~~41~~~,???
FROM: SHIP,~~~~~~76~,???
 TC1: UNK/ERR
 TC2: UNK/ERR
FREQ: --/--
 POS: --
 EOS: ~~~
cECC: 29 ERR

TIME: 2023-10-05 01:47:04 FREQ: 8414.5 DIST: -- Km
SYMB: 120 120 000 036 060 000 030 111 063 060 018 084 020 106 024 126 126 126 126 126 126 117 071 117 117
 FMT: SEL
 CAT: UNK
  TO: COAST,003660003,USA,ShipCom WLO
FROM: SHIP,636018842,DEVELOPMENT DRILLER3,D5RQ4,Other
 TC1: DATA
 TC2: UNK/ERR
FREQ: --
 POS: --
 EOS: REQ
cECC: 71 OK

TIME: 2023-10-05 01:51:33 FREQ: 8414.5 DIST: -- Km
SYMB: 120 120 000 036 060 000 030 111 063 060 018 084 020 106 024 126 126 126 126 126 126 117 071 117 117
 FMT: SEL
 CAT: UNK
  TO: COAST,003660003,USA,ShipCom WLO
FROM: SHIP,636018842,DEVELOPMENT DRILLER3,D5RQ4,Other
 TC1: DATA
 TC2: UNK/ERR
FREQ: --
 POS: --
 EOS: REQ
cECC: 71 OK

TIME: 2023-10-05 01:54:05 FREQ: 8414.5 DIST: -- Km
SYMB: 120 120 000 036 069 099 000 108 037 022 ~~~ 000 000 118 126 126 126 126 126 126 ~~~ 117 022 ~~~ ~~~
 FMT: SEL
 CAT: SAF
  TO: COAST,003669990,USA,Point Reyes
FROM: SHIP,3722~~000,???
 TC1: TEST
 TC2: NOINF
FREQ: --
 POS: --
 EOS: REQ
cECC: 38 ERR

TIME: 2023-10-05 01:55:15 FREQ: 8414.5 DIST: -- Km
SYMB: 120 120 000 036 060 000 030 111 063 060 018 084 020 106 024 126 126 126 126 126 126 117 071 117 117
 FMT: SEL
 CAT: UNK
  TO: COAST,003660003,USA,ShipCom WLO
FROM: SHIP,636018842,DEVELOPMENT DRILLER3,D5RQ4,Other
 TC1: DATA
 TC2: UNK/ERR
FREQ: --
 POS: --
 EOS: REQ
cECC: 71 OK

TIME: 2023-10-05 01:55:32 FREQ: 8414.5 DIST: -- Km
SYMB: 120 120 000 022 041 007 080 108 023 020 017 093 080 118 126 126 126 126 126 126 126 117 030 117 117
 FMT: SEL
 CAT: SAF
  TO: COAST,002241078,E,Madrid Radio
FROM: SHIP,232017938,ANGLO MARIMAR,MDVA6,Cargo
 TC1: TEST
 TC2: NOINF
FREQ: --
 POS: --
 EOS: REQ
cECC: 30 OK

TIME: 2023-10-05 01:59:06 FREQ: 8414.5 DIST: -- Km
SYMB: 120 120 000 036 060 000 030 111 063 060 018 084 020 106 024 126 126 126 126 126 126 117 071 117 117
 FMT: SEL
 CAT: UNK
  TO: COAST,003660003,USA,ShipCom WLO
FROM: SHIP,636018842,DEVELOPMENT DRILLER3,D5RQ4,Other
 TC1: DATA
 TC2: UNK/ERR
FREQ: --
 POS: --
 EOS: REQ
cECC: 71 OK

TIME: 2023-10-05 01:59:16 FREQ: 8414.5 DIST: -- Km
SYMB: 120 120 000 073 000 050 010 108 053 080 008 042 040 118 126 126 126 126 126 126 126 117 119 117 117
 FMT: SEL
 CAT: SAF
  TO: COAST,007300501,CLM,Cartagena
FROM: SHIP,538008424,HELLAS DYNASTY,V7A2143,Tanker
 TC1: TEST
 TC2: NOINF
FREQ: --
 POS: --
 EOS: REQ
cECC: 119 OK

TIME: 2023-10-05 02:00:45 FREQ: 8414.5 DIST: 7985 Km
SYMB: 120 120 043 010 057 000 000 108 000 023 071 000 000 118 126 004 012 050 004 012 050 122 046 122 122
 FMT: SEL
 CAT: SAF
  TO: SHIP,431057000,TANGO,7KAB,N/A
FROM: COAST,002371000,GRC,Olympia Radio
 TC1: TEST
 TC2: NOINF
FREQ: --
 POS: --
 EOS: ACK
cECC: 46 OK

TIME: 2023-10-05 02:01:13 FREQ: 8414.5 DIST: -- Km
SYMB: 120 120 000 022 041 002 020 108 063 060 092 021 020 118 126 126 126 126 126 126 126 117 030 117 ~~~
 FMT: SEL
 CAT: SAF
  TO: COAST,002241022,E,Coruna Radio
FROM: SHIP,636092212,MSC ALICANTE,A8YN7,Cargo
 TC1: TEST
 TC2: NOINF
FREQ: --
 POS: --
 EOS: REQ
cECC: 30 OK

TIME: 2023-10-05 02:01:34 FREQ: 8414.5 DIST: -- Km
SYMB: 120 120 000 036 069 099 ~~~ 108 ~~~ 096 060 000 000 ~~~ 126 126 ~~~ ~~~ ~~~ ~~~ 126 ~~~ ~~~ 049 ~~~
 FMT: SEL
 CAT: SAF
  TO: COAST,00366999~, UNID
FROM: SHIP,~~9660000,???
 TC1: UNK/ERR
 TC2: NOINF
FREQ: --
 POS: --
 EOS: UNK/ERR
cECC: 52 ERR

TIME: 2023-10-05 02:03:22 FREQ: 8414.5 DIST: -- Km
SYMB: 120 120 047 006 024 000 000 108 000 023 071 ~~~ 000 118 126 004 012 050 004 012 050 122 007 ~~~ ~~~
 FMT: SEL
 CAT: SAF
  TO: SHIP,470624000,GHASHA,A6E2817,Dredging
FROM: COAST,002371~~0, UNID
 TC1: TEST
 TC2: NOINF
FREQ: --
 POS: --
 EOS: ACK
cECC: 7 OK

TIME: 2023-10-05 02:03:35 FREQ: 8414.5 DIST: -- Km
SYMB: 120 120 000 036 060 000 030 111 063 060 018 084 020 106 024 126 126 126 126 126 126 117 071 117 117
 FMT: SEL
 CAT: UNK
  TO: COAST,003660003,USA,ShipCom WLO
FROM: SHIP,636018842,DEVELOPMENT DRILLER3,D5RQ4,Other
 TC1: DATA
 TC2: UNK/ERR
FREQ: --
 POS: --
 EOS: REQ
cECC: 71 OK

TIME: 2023-10-05 02:07:10 FREQ: 8414.5 DIST: -- Km
SYMB: 120 120 000 036 060 000 030 111 063 060 ~~~ ~~~ ~~~ ~~~ ~~~ ~~~ ~~~ ~~~ ~~~ ~~~ ~~~ ~~~ ~~~ ~~~ 082
 FMT: SEL
 CAT: UNK
  TO: COAST,003660003,USA,ShipCom WLO
FROM: SHIP,6360~~~~~,???
 TC1: UNK/ERR
 TC2: UNK/ERR
FREQ: --/--
 POS: --
 EOS: UNK/ERR
cECC: 18 ERR

TIME: 2023-10-05 02:07:42 FREQ: 8414.5 DIST: -- Km
SYMB: 120 120 000 072 051 086 000 108 041 064 095 000 000 118 126 126 126 126 126 126 126 117 114 117 117
 FMT: SEL
 CAT: SAF
  TO: COAST,007251860,CHL,Valparaiso Radio
FROM: SHIP,416495000,EVER LOYAL,BKIZ,Cargo
 TC1: TEST
 TC2: NOINF
FREQ: --
 POS: --
 EOS: REQ
cECC: 114 OK

RSPduo | Wellbrook loop antenna | YaDD decoder

[tiNG]

Hi.

This looks a bit too much like DSC (SITOR-B) traffic on 8414,5 kHz, not 8412,5 kHz.

Could you please verify that?

Hope this helps.

[~SIGINT~]

Hello Thomas,

You may be correct with regards to it being DSC traffic on 8414.5. I am not overly familiar with what the shift is from centre frequecy for this type of operation. The receiver was tuned to 8412.5 USB and YaDD was set at 2 kHz. If the shift is 2 kHz then 8414.5 would be correct as it is a world wide DSC distress/safety frequency.

[tiNG]

Hi.

Shift is 170 Hz, I guess you mean "Offset"...

As this is an FSK transmission the center frequency (CF) and window frequency (WF, or dial frequency DF) for this mode is both 8414,5 kHz - right between "mark" and "space". This is valid for ANY fsk mode on HF - RTTY, SITOR (including DSC), FAX, STANAG4481 etc.

What you are using as window frequency (WF) or dial frequency (DF) is depending on the decoder/modem you are using. Normally the offset for DSC is 1700 Hz (a.f.a.i.k. defined by ITU and IMO for the maritime mobile service on HF, including GMDSS). Same with NAVTEX on 490 and 518 kHz - that is the CF transmitted, despite the fact if it is modulated by a modem or directly by the transmitter.

On the other hand we have those PSK, OFDM, BPSK etc. modes where CF and WF are different (STANAG4285, MIL-STD 188-141, MIL-STD 188-110 etc.). The offset for S4285 for example is 1800 Hz so you have a WF/DF of let's say 3998,2 kHz and a CF of 4000,0 kHz.

Please be aware of this difference in modulation and demodulation of any frequency shift keying - from RTTY, SITOR-A/-B (and DSC), NAVTEX, STANAG4481, DPRK-FSK, AKKORD and so on.

Hope this helps.

[~SIGINT~]

Hi Thomas,

Thank you for the great information. I was aware of some of the other modes but never spent much time listening to maritime traffic before. I have set the decoder to 1700 kHz offset.