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## Topband: Another Antenna Question

 To: Top Band Topband: Another Antenna Question "Mike(W5UC) & Kathy(K5MWH)" Tue, 21 Aug 2007 20:09:18 -0500
 While searching for information about RX antennas, I ran across K7TKR's page and ultimately his receive antenna comparison. http://www.k7tjr.com/rx1comparison.htm Having to make the most of a small lot, only two antennas appear to be a choice; the K9AY array, and two verticals spaced fairly closely.(1/8 WL or less) Per Lee's chart, the pair of verticals has a RDF of 9.03, and the K9AY antenna has a RDF of 7.2, a difference of 1.83. This brings my first question which is: How much difference in performance will that variation in RDF make? The second question comes from modeling a two vertical array in EZ-Nec. By experimenting with EZ-Nec I have determined that I can vary the F/B of a two vertical array by varying the length of the delay line, and ange of radiation of the antenna. Additionally, if I understand the calculation of RDF, RDF can be manipulated by varying the F/B of the antenna. Thus the second question; How do I determine what reasonable and practical numbers are for calculating RDF? This brings the 3rd and final question. Are my methods, as described above, flawed? 73, Mike, W5UC "age & treachery will overcome youth & skill" http://www.suddenlink.net/pages/w5uc/ _______________________________________________ Topband mailing list Topband@contesting.com http://lists.contesting.com/mailman/listinfo/topband
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