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On Wed, 05 Sep 2007 20:34:40 -0400, Bob Schreibmaier wrote:
I used legs of 45 and 90 feet. The SWR was about 1.0 at 3.5 MHz and 1.3 at 3.6 MHz. Actually, it didn't reach 2.0 until about 3.75 MHz. Lowest SWR on 40 meters was at 7.2 MHz at about 1.0 and was low across the band. The lowest SWR on 20 meters was at 14.35 MHz at about 1.0, but was 1.8 at the bottom of the band. Good afternoon, Bob. Since it's 92 degrees and about 95 percent humidity out, I decided now was a good time to go outside and do some antenna work. :-) I reduced one leg and increased the other to get the 45 and 90 feet you suggest, but I must have cut it a bit long, because I'm getting SWR dips of 1.12 at 3350, 1.1 at 6.701, and 1.4 at 14.4. Band edges a 3.50 -- 1.5 4.00 -- 3.8 7.00 -- 1.75 7.30 -- 2.8 14.00 -- 1.9 14.35 -- 1.44 This is the Carolina Windom configuration (more or less...) 4:1 W2AU type balun, 22 feet of RG-8X, and a 1:1 current unun, then 25 feet of feedline which is currently sort of looped back on itself (really only need about 8 feet). I was really hoping to get the antenna up higher than it is, because right now the bottom 3 or 4 feet of the 22-foot segment, and the unun, are lying on the roof, but it's as high as I'm going to be able to get it for the foreseeable future. Performance seems on a par with, or slightly inferior to, my 180-foot inverted V fed with ladder line and an LDG autotuner. But, I haven't really had a chance to test it yet. And, the inverted V connects to my old IC-735 which has far and away the very BEST non-DSP noise blanker I've ever used, much better than the one on the TS-940S which currently hosts the CW. When I get a chance I'll dig out a coax switch and connect both antennas to the same radio for some apples to apples comparison tests. |
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