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In this live example, JRCC Australia (MMSI 003669991) is calling Merchant Oil tanker Signal Maya (MMSI 248410000) on 12577kHz at 15:59:43 UTC on November 21, 2021. it starts with a short dot-pattern/phasing sequence for automatic tuning, followed by the content.
SDR CONSOLE CW DECODER SOFTWARE
The software has to look up those source-coded messages in a codebook to print a readable message, giving some sense.
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There is a set of 127 symbols, with the first numbers 00 to 99 representing numbers, and each of the remaining number specific situations like “110” denoting “Man over board”. MMSIs starting with 00 denote a Coastal Station, e.g., 004123100 for Guangzhou Radio/China. To establish a call, each station has been assigned to an unique MMSI, or Maritime Mobile Security Identity number consisting of now nine digits, in future 10 digits. Waveform is ‘kind of SITOR-B, repeating each character twice with a 400ms spread to enhance proper decoding under adverse propagation ( Rec. Transmission is done in 2-FSK with 170Hz shift and at speed of 100Bd. Monitoring on all six main channels in parallel, often raises 3000+ messages a day! You may hear vessels of each and every kind, from small ones for pleasure to the biggest oil tankers, and all over the world. In this case from Vestmannaeyjar Radio in Iceland to Cape Town Radio in South Africa, and from Valparaiso Playo Ancha Radio in Chile to Taupo Maritime Radio in New Zealand. Reception of both, Coastal Stations and vessels, is from around the world. There, the six main channels range from 2MHz to 16MHz.
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This blog entry focus on Black Cat GMDSS decoder, hence on HF. The Global Maritime Distress and Safety System is a system of different maritime communications tools on frequencies ranging from as low as 424kHz over HF and VHF up to satellite channels in the GHz region. In addition to an extraordinary sensitive decoder, it also includes smart processing of the data – from looking up vessel’s complete data from ITU’s Ship Station List (internet connection needed) to saving all data to a fully-fledged database. Decoding all GMDSS channels at once: Black Cat System’s groundbreaking GMDSS Decoder.Ĭhris Smolinski, W3HFU, did it again: after his multi-channel attack to ALE, he now offers this highly innovative concept also for GMDSS – Black Cat GMDSS.