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Thoughts about the tape measure 3 element direction findingYagi
On Tue, 30 Aug 2011 09:03:33 +0200, Helmut Wabnig wrote:
I wonder how important matching is for a pure direction finding antenna, I don't think it affects sensitivity, which is not really at a premium anyhow. A gamma match seems to skew forward-max location a bit to one side, which matters if you're relying on accurate bearings from a distance, but overall it doesn't matter much - in some ways it's better to expect to spiral in on the fox a little anyhow, I reckon. The gamma match also goes wonky if you put your hand on it, but I guess that's not surprising. many of the top competitors use them anyhow - we have a design that's easy to disassemble to put into a suitcase for air travel. One of the guys built a much-enhanced version of the NEC software for the Mac, and he's automated it to automatically optimise (millions of individual runs with different combinations) a 7-element boom for 70cm, which is yielding very impressive DF results right across the band. Clifford Heath. |
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