>... Craigs description suggests the bearings are > likely to be calculated from an array of directional aerials rather than > physically rotating an aerial, which makes sense of the fast speed of > response. Last time I remember thinking about this was in early 1960's when > reading "Practical Wireless":~) Modern technique is to use a pseudo-Doppler array, which is a ring of 4 or more antennas that are switched using diodes. This can give you very fine resolution with no moving parts. In fact, it can be done with only two antennas, albeit with a 180 degree uncertainty that can generally be resolved with two bearings. -- mike *************************************************************************** PaddleWise Paddling Mailing List - Any opinions or suggestions expressed here are solely those of the writer(s). You must assume the entire responsibility for reliance upon them. All postings copyright the author. Submissions: PaddleWise_at_PaddleWise.net Subscriptions: PaddleWise-request_at_PaddleWise.net Website: http://www.paddlewise.net/ ***************************************************************************Received on Thu Sep 19 2002 - 08:09:06 PDT
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