Since a tin plated box is not the nicest enclosure I decided to spend some time and make the design to fit a nice case ( Case #1111 at ) which I still had laying around. I created a prototype to fit into a tin plated box, and it has been running wonderfully for some time now. Since I am not “afraid” of SMD components it is not a problem to use these.
The DIP version would be a lot easier to use, but it would take up a lot more PCB real estate. Unfortunately the only version of the CMX589 which is available at eBay is the SMD (24 pin TSSOP) version. The Xport is also available at Mouser or Digikey, but for around $45-$50 each, so it is worthwhile checking eBay! The CMX589 is not available at Mouser or Digikey, so the only option to get them is eBay. I was lucky and spent only $25 for the both of them. I bought the required decoder chip, the CMX589A ( datasheet) at eBay, together with the Xport module. For network connectivity I decided to use a Lantronix Xport module ( datasheet) which are regularly available at eBay for not too much… I found a suitable receiver module at Radiometrix in the UK, the NRX1 . It looked very promising so I decided to use that design as a basis for my integrated receiver / decoder.
When investigating the possibility to build my own decoder I came across the website of Alex Scafidas where he describes the design of an AIS decoder based on an ATMega8 microcontroller and a CMX GMSK decoder IC.
A lot of people use modified maritime radios or scanners with a hardware decoder and a PC to collect and transmit the data. (More info: Class A and Class B fact sheets)Ĭommercial AIS receivers are normally expensive, and not easily available. Volunteers all over the world receive this data, and forward it to the website so it can be used to show the information. One of the websites I like a lot is This website shows shipping traffic all over the world, which it collects using the AIS data which every ship over 300t gross tonnage has to broadcast. Due to my job I am very interested in the merchant shipping world.
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