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ContinuousWave: Small Boat Electrical
Digital Selective Calling Tests
|Author||Topic: Digital Selective Calling Tests|
posted 05-15-2014 11:51 AM ET (US)
I have now authored four articles about digital selective calling (DSC) equipment, primarily DSC radios but also including chart plotters which can use data from DSC radios, that might be typically used in a small recreational boat installation. I'd like to call readers' attention to these articles, explain what each article examined, and give a short summary of the findings.
The first test examined the behavior of an older but popular DSC radio, qualified to an initial specification for DSC. The older radio was used to send a DSC distress alert message. The most surprising result was that the message sent included only a coarse position for the vessel. This article appears at
DSC Distress Message Test
The second test examined the behavior of a very recent model DSC radio, qualified to the most recent specification for DSC. This newer radio sent a DSC distress alert message with a position for the vessel to a resolution of 0.001-minute of latitude and longitude. This article appears at
DSC Distress Alert Message Test 2
The third article reports on my investigation into the format of the datagrams being sent from a DSC radio when it receives a call. These datagrams are not particularly well documented publicly, and this investigation attempts to discover more about them. Some insight into their structure is presented. This article appears at
Data Interface in Digital Selective Calling Class-D Radios
The fourth article extends the communication system being tested to include a chart plotter receiving information from a DSC radio. The test found rather surprising inconsistencies in the interpretation of information across this link. The article appears at
Chart Plotter Interface in Digital Selective Calling
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