26/12/2011 - L'incremento del traffico DSC (GMDSS) in MF e HF che desta tanto "stupore" su alcuni blog dedicati al radioascolto in realtà è solo la conferma relativa alla corretta modalità di funzionamento del sistema stesso. Senza entrare nel dettaglio della normativa, il sistema GMDSS ha suddiviso la terra in quattro aree di mare: A1, A2, A3 ed A4 (nelle immagini in basso, relative al Mediterraneo ed al Nord Atlantico Orientale, le suddette aree possono essere individuate attraverso i differenti colori che evidenziano anche il limite della copertura geografica).

Ebbene mentre per l'area A3 esiste la possibilità di poter scegliere se avere a bordo, in sostituzione degli apparati satellitari Inmarsat, apparati RTX MF/HF, per  l'area A4 (non coperta dal segnale satellitare) è obbligatorio avere a bordo anche apparati RTX MF/HF. E' evidente, quindi, che con l'estensione dell'uso del GMDSS il traffico radio DSC in MF ed in HF (oltre che in VHF) è destinato ad aumentare.

Frequenze: nell'ambito del sistema GMDSS, ovviamente, la priorità non è il DX... pertanto tra le molte frequenze disponibili, le raccomandazioni impongono l'ascolto continuo  (in funzione dell'area di navigazione) sul canale 70 VHF (156.525 MHz), su 2187.5 kHz, su 8414.5 kHz + un'altra frequenza HF. In situazioni di emergenza non è importante farsi ascoltare da lontane stazioni MRCC o dalle navi agli antipodi ma... farsi ascoltare, tout court...

Test: esistono due modalità di test: la prima senza trasmissione radio deve essere effettuata ogni giorno; la seconda (contattando una stazione costiera) si deve effettuare almeno una volta alla settimana. E' proprio quest'ultima che "riempie" i log degli appassionati di radioascolto.

ITU: cliccando su questo link è possibile scaricare, in formato pdf, la raccomandazione ufficiale ITU-R M.493-12* che descrive in modo dettagliato la Chiamata Digitale Selettiva (DSC).

Infine un piccolo log relativo alla ricezione e decodifica (con Multipsk 4.20) di traffico DSC su 8414.5 kHz  :

Called: 304010915 (Antigua and Barbuda) (Routine) by: Istanbul MRCC Ankara / J3E telephony / RX: 2187.5 KHz RX/TX: 2187.5 KHz / OK
ITU ship information: JACARANDA - V2PC5 - ATG 24/12/2011 13:46:36

Called: 304010915 (Antigua and Barbuda) (Routine) by: Istanbul MRCC Ankara / J3E telephony /
ITU ship information: JACARANDA - V2PC5 - ATG 24/12/2011 13:46:42

Called: 304010915 (Antigua and Barbuda) (Routine) by: 012711000 / J3E telephony / RX: 2507.5 KHz RX/TX: 2187.5 KHz /

Called: 304010915 (Antigua and Barbuda) (Routine) by: Istanbul MRCC Ankara / J3E telephony / RX: 2187.5 KHz RX/TX: 2187.5 KHz / OK
ITU ship information: JACARANDA - V2PC5 - ATG 24/12/2011 13:47:02

Called: Madrid Radio MRCC Madrid (Safety) by: 538090298 (Marshall Islands) / Test / OK
ITU ship information: PORT SAID - V7EJ7 - MHL 24/12/2011 13:53:38

Called: Madrid Radio MRCC Madrid (Safety) by: 236445000 (Gibraltar) / Test / OK
ITU ship information: BROVIG VINDUR - ZDIJ3 - G 24/12/2011 13:57:44

Called: 236445000 (Gibraltar) (Safety) by: Bilbao MRCC Bilbao / Test /
ITU ship information: BROVIG VINDUR - ZDIJ3 - G 24/12/2011 13:58:07

Called: Madrid Radio MRCC Madrid (Safety) by: 209992000 (Cyprus) / Test /
ITU ship information: ESTHER SCHULTE - P3DS9 - CYP 24/12/2011 14:05:34

Called: 209992000 (Cyprus) (Safety) by: Bilbao MRCC Bilbao / Test / OK
ITU ship information: ESTHER SCHULTE - P3DS9 - CYP 24/12/2011 14:06:28

Called: Madrid Radio MRCC Madrid (Safety) by: 215062000 (Malta) / Test /
ITU ship information: WILSON NEWCASTLE - 9HA2628 - MLT 24/12/2011 14:07:40

Called: 215062000 (Malta) (Safety) by: Bilbao MRCC Bilbao / Test /
ITU ship information: WILSON NEWCASTLE - 9HA2628 - MLT 24/12/2011 14:08:02

Called: Corsen (CROSS) MRCC Corsen (Safety) by: 352982000 (Panama) / Test / Error
ITU ship information: PRINCESS JUANA K - HPFV - PNR 24/12/2011 14:10:10

Called: 241153000 (Safety) by: Bilbao MRCC Bilbao / Test / OK
24/12/2011 14:11:09

Called: 309372000 (Bahamas) (Safety)by: 5486880 (Philippines) /
ITU search failure 3 24/12/2011 14:11:57

Called: Madrid Radio MRCC Madrid (Safety) by: 356088000 / Test / OK
ITU ship information: OCEAN ADVENTURE - 3EAI5 - PNR 24/12/2011 14:14:23

Called: 241153000 (Safety) by: Bilbao MRCC Bilbao / Test /
24/12/2011 14:17:45

Called: Lyngby MRCC Arhus, MRCC Bremen (Safety) 24/12/2011 14:20:28

Called: 371361000 (Panama) (Safety) by: Cyprus RCC Larnaca / Test /
ITU ship information: SANKO BLOSSOM - 3ECJ9 - PNR 24/12/2011 14:21:19

Called: Bilbao MRCC Bilbao (Routine) by: Bilbao MRCC Bilbao / F3E/G3E All modes telephony / OK 24/12/2011 14:21:58

Called: Madrid Radio MRCC Madrid (Safety) by: 258605000 (Norway) / Test / OK
ITU ship information: SPAR LUPUS - LAVD5 - NOR 24/12/2011 14:24:19

Called: MRCC Falmouth MRCC Falmouth (Safety) by: 258876000 (Norway) / Test / Error
ITU ship information: SIDSEL KNUTSEN - LASM4 - NOR 24/12/2011 14:24:26

Called: 306004000 (Netherlands Antilles) (Safety) by: Bilbao MRCC Bilbao / Test / OK
24/12/2011 14:27:16

Called: 538004303 (Marshall Islands) (Safety) by: 352952000 (Panama) / Test /
24/12/2011 14:31:37

Called: Madrid Radio MRCC Madrid (Routine) by: 538003170 (Marshall Islands) / J3E telephony / RX: 8414.5 KHz RX/TX: 8414.5 KHz / Error
ITU ship information: MPP SHIELD - V7OV8 - MHL 24/12/2011 14:31:57

Called: 235057797 (United Kingdom) (Safety) by: Bilbao MRCC Bilbao / Test / OK
ITU ship information: BET FIGHTER - MXHM - G 24/12/2011 14:32:38

Called: Corsen (CROSS) MRCC Corsen (Safety) by: 305169000 (Antigua and Barbuda) / Test / OK
ITU ship information: SHIRKAN C - V2DC6 - ATG 24/12/2011 14:36:40

Called: Olympia JRCC Piraeus (Safety) by: 305577000 (Antigua and Barbuda) / Test /
ITU ship information: WESERTOR - V2EV9 - ATG 24/12/2011 14:40:27

Called: 304010860 (Antigua and Barbuda) (Safety) by: Bilbao MRCC Bilbao / Test / OK
ITU ship information: POMMERN - V2LD - ATG 24/12/2011 14:42:17

Called: Charleville/Wiluna RCC Australia (Safety) by: 538001826 (Marshall Islands) / Test /
ITU ship information: GENMAR ARGUS - V7EL2 - MHL 24/12/2011 14:43:37

Called: Madrid Radio MRCC Madrid (Safety) by: 351300000 (Panama) / Test / OK
ITU ship information: KORIANGI - 3FCR8 - PNR 24/12/2011 14:47:08

Called: MRCC Aberdeen MRCC Aberdeen (Safety) by: 538003322 (Marshall Islands) / Test / OK
ITU ship information: OVERSEAS YELLOWSTONE - V7QA4 - MHL 24/12/2011 14:48:11

Called: 228320600 (France) (Safety) by: Bilbao MRCC Bilbao / Test / OK
ITU ship information: FS CLARA - FMBZ - F 24/12/2011 14:48:56

Called: 215782000 (Malta) (Safety) by: 248964000 (Malta) /
ITU search failure 3 24/12/2011 14:49:32

Called: 636091776 (Liberia) (Safety) by: Bilbao MRCC Bilbao / Test / OK
24/12/2011 14:57:12

Called: 209992000 (Cyprus) (Safety) by: Bilbao MRCC Bilbao / Test / OK
ITU ship information: ESTHER SCHULTE - P3DS9 - CYP 24/12/2011 15:10:36

Called: 355118000 (Safety) by: Piraeus JRCC JRCC Piraeus / Test / OK
ITU ship information: DIDON - 3FDD7 - PNR 24/12/2011 15:12:18

Called: Olympia JRCC Piraeus (Safety) by: 271000601 (Turkey) / Test / OK
ITU ship information: MEHMET UNLU - TCMF - TUR 24/12/2011 15:13:56

Called: 477815400 (Hong Kong) (Safety) by: Bilbao MRCC Bilbao / Test / OK
ITU ship information: COSCO JINGGANGSHAN - VRHB8 - CHN 24/12/2011 15:14:05

Called: 538003905 (Marshall Islands) (No control by check sum.
ITU ship information: GREBE BULKER - V7TY4 - MHL 24/12/2011 15:17:15

Called: 538004338 (Marshall Islands) (Safety) by: 538003905 (Marshall Islands) / Test / OK
ITU search failure 3 24/12/2011 15:17:45

Called: 355118000 (Safety)
ITU ship information: DIDON - 3FDD7 - PNR 24/12/2011 15:21:08

Called: 205559000 (Belgium) (Safety) by: 248964000 (Malta) / J3E telephony /
ITU search failure 3 24/12/2011 15:22:44

Called: Malaga MRCC Tarifa, MRCC Almeria (Safety) by: 636014357 (Liberia) / Test / OK
ITU ship information: UASC YANBU - A8TH7 - LBR 24/12/2011 15:23:38

Called: La Garde (CROSS) MRCC La Garde (Safety) by: 636014357 (Liberia) / Test / OK
ITU ship information: UASC YANBU - A8TH7 - LBR 24/12/2011 15:30:20

Called: 227187000 (France) (Safety) by: Bilbao MRCC Bilbao / Test /
ITU ship information: MEDITERRANEE - FNYF - F 24/12/2011 15:32:37

Called: Olympia JRCC Piraeus (Safety) by: 356205000 / Test / Error
ITU ship information: MSC KIM - 3EPZ - PNR 24/12/2011 15:33:00

Called: 257316000 (Norway) (Safety) by: Bilbao MRCC Bilbao / Test / OK
ITU ship information: SPAR LYRA - LAZP5 - NOR 24/12/2011 15:44:09

Called: Madrid Radio MRCC Madrid (Safety) by: 257316000 (Norway) / Test / OK
ITU ship information: SPAR LYRA - LAZP5 - NOR 24/12/2011 15:44:19

Called: Witowo MRCC Gdynia (Safety) by: 236498000 (Gibraltar) / Test / OK
ITU ship information: ESHIPS NAHYAN - ZDIY2 - G 24/12/2011 15:45:54

Called: Lyngby MRCC Arhus, MRCC Bremen (Safety) by: 236498000 (Gibraltar) / Test / OK
ITU ship information: ESHIPS NAHYAN - ZDIY2 - G 24/12/2011 15:47:05

Called: 308512000 (Bahamas) (Safety)
ITU ship information: HOOD ISLAND - C6LU4 - BAH 24/12/2011 15:55:48

Called: 209510000 (Cyprus) (Safety) by: Cyprus RCC Larnaca / Test / OK
ITU ship information: HODA - 5BBE2 - CYP 24/12/2011 16:04:36

Called: Lyngby MRCC Arhus, MRCC Bremen (Safety) by: 249759000 (Malta) / Test /
ITU ship information: SEA PRIDE - 9HFL5 - MLT 24/12/2011 16:06:33

Called: Madrid Radio MRCC Madrid (Safety) by: 538001826 (Marshall Islands) / Test / OK
ITU ship information: GENMAR ARGUS - V7EL2 - MHL 24/12/2011 16:14:44

Called: 538001826 (Marshall Islands) (Safety) by: Bilbao MRCC Bilbao / Test /
ITU ship information: GENMAR ARGUS - V7EL2 - MHL 24/12/2011 16:15:10

Called: 240463000 (Greece) (Safety) by: Bilbao MRCC Bilbao / Test /
ITU ship information: BOUBOULINA - SZIS - GRC 24/12/2011 16:23:34

Called: 250000114 (Ireland) (Routine) by: 636013999 (Liberia) / J3E telephony / Ships and aircraft according to Resolution 18 /
24/12/2011 16:37:59

Called: Lyngby MRCC Arhus, MRCC Bremen (Safety) by: 538090307 (Marshall Islands) / Test / OK
ITU ship information: FURTH - V7MP5 - MHL 24/12/2011 16:52:39

Called: 370186000 (Safety) by: 354544000 (Panama) / J3E telephony /
ITU search failure 3 24/12/2011 16:54:35

Called: Lyngby MRCC Arhus, MRCC Bremen (Safety) by: 249387000 (Malta) / Test / OK
ITU ship information: DON 1 - 9HQX9 - MLT 24/12/2011 16:56:10

Called: 636014327 (Liberia) (Safety) by: Bangkok (Nonthaburi) RCC Bangkok / Test /
ITU ship information: ABIGAIL N - A8TC7 - LBR 24/12/2011 17:14:18

Called: 308512000 (Bahamas) (Safety)
ITU ship information: HOOD ISLAND - C6LU4 - BAH 24/12/2011 17:25:47

Called: Boston MA MRCC Boston MA, MRCC Norfolk VA (Safety) by: 538002875 (Marshall Islands) / Test / OK
ITU ship information: SEMIRIO - V7MN4 - MHL 24/12/2011 17:34:14

Called: 248770000 (Malta) (Safety) by: Bangkok (Nonthaburi) RCC Bangkok / Test /
ITU ship information: POLA PACIFIC - 9HA2505 - MLT 24/12/2011 17:40:03

Called: 273392000 (Russian Federation) (Safety) by: / Test /
ITU ship information: SAMUR-12 - UAIE - RUS 24/12/2011 17:42:06

Called: Varna MRCC Varna (Safety) by: 273315300 (Russian Federation) / Test / OK
ITU ship information: NIKOLAY LEBEDEV - UAQT - RUS 24/12/2011 17:54:18

Called: 538004282 (Marshall Islands) (Safety) by: Cyprus RCC Larnaca / Test / OK
24/12/2011 18:01:13

Called: Olympia JRCC Piraeus (Safety) by: 642137027 (Libya) /
24/12/2011 18:03:11

Called: Charleville/Wiluna RCC Australia (Safety) by: 256874000 (Malta) / Test /
ITU ship information: NAJM - 9HEQ9 - MLT 24/12/2011 18:36:12

Called: Charleville/Wiluna RCC Australia (Safety) by: 256874000 (Malta) / Test / Error
ITU ship information: NAJM - 9HEQ9 - MLT 24/12/2011 18:41:08

Called: MRCC Aberdeen MRCC Aberdeen (Safety) by: 538003322 (Marshall Islands) / Test /
ITU ship information: OVERSEAS YELLOWSTONE - V7QA4 - MHL 24/12/2011 19:01:48

Called: Shanghai MRCC Shanghai/MRCC China (Safety) by: 351392000 (Panama) / Test / Error
ITU ship information: MORNING CARINA - 3ENP9 - PNR 24/12/2011 19:03:16

Called: Cyprus RCC Larnaca (Routine) by: 240944000 (Greece) / J3E telephony / Position: 34°55'N 024°51'E / OK
ITU ship information: ASAHI PRINCESS - SVAT4 - GRC 24/12/2011 19:04:42

Called: Aspropirgos Attikis JRCC Piraeus (Safety) by: 273315300 (Russian Federation) / Test /
ITU ship information: NIKOLAY LEBEDEV - UAQT - RUS 24/12/2011 19:05:21

Called: Istanbul MRCC Ankara (Safety) by: 256151000 (Malta) / Test / OK
ITU ship information: ICDAS-09 - 9HA2822 - MLT 24/12/2011 19:09:09

Called: Istanbul MRCC Ankara (Safety) by: 311053200 (Bahamas) / Test / OK
ITU ship information: GALATEIA - C6ZD6 - BAH 24/12/2011 19:27:00

Called: 538002922 (Marshall Islands) (Routine) by: 538002917 (Marshall Islands) / J3E telephony / RX: 12353.0 KHz RX/TX: 12353.0 KHz / OK
ITU search failure 3 24/12/2011 19:38:24

Called: 352299000 (Panama) (Safety) by: 352299000 (Panama) / Test / OK
ITU ship information: TAI PRIZE - H9EM - PNR 24/12/2011 19:46:59