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AIS Receiver Range Record?
Paul wrote: I just received a SR162 dual-channel AIS receiver, which I will be using on my sailboat -- the old single-channel SR161 will end up at home. I've been testing at my house it these last couple of days, and have been amazed at the range I have been getting. I've seen many ships 100 to 200 nautical miles from my position, and last night saw one at 492 miles, and another at 673 miles" (this one was "Ikarugu", a freighter heading to Long Beach, CA) That's pretty close to the furthest one I've seen. We were using high sensitivity receivers and a directional yagi antenna pointed SW from near Seattle. I saw several reports from 650nM out, off the coast of California. With a good antenna and receiver 200nM reports are no problem. You don't get every one but 30% is enough to let you know who is where. The USCG is really interested in long range AIS, they have done a whole bunch of experiments relating propagation to the state of the troposphere. Here is a really good site with graphs: http://www.dxinfocentre.com/tropo.html |
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