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<< The spacing between these two wires if not correct > can cause 15 meter resonance well below the band and subsequent higher and > out of spec VSWR on 15 meters. A spacing of anything greater than 1/4" will > usually cause this high VSWR problem. This issue seems to be exacerbated by > installations of lower than 1 wavelength. >> Natan, As an early C31XR owner I have fought with this problem at length. Tom told me they should be close, but one-quarter inch!! I have added/subtracted 5-15' of coax and found a little help in, apparantly, avoiding critical feed line lengths. But, I'm over 1/4" on my spacing, that's for sure! It's up 110' so when I go up there, I want to be sure I have the right information. I recently noticed that one of the jumpers connecting/separating the 15 & 20 driven elements has disappeared. Are you still going with the SS hose clamp type installation on these plastic pieces? Unfortunately, I notice that, if windy, the SWR on 15 now really dances around. Fortunately, my extensive experience with trying to tune the 15 portion of the antenna has me well prepared to tilt the antenna and reach out and grab these elements to effect this repair! If this will fix the 15 SWR problem, then this antenna will truly be a world beater--even from Northern Minnesota. (over 100 countries and 1000 Q's on each band 10 & 20 in ARRLCW DX). 15 meters used a lower side mount C4. Thanks, John Baumgarten, N0IJ Duluth, MN -------------------------------------------- Force12Talk mailing list provided as a service by Force 12 Antennas, Inc. Force 12 Web site: http://www.qth.com/force12 Submissions: send to Force12Talk@qth.com To unsubscribe: send a blank e-mail to Force12Talk-leave@qth.com Force12Talk Message Archive: http://www.qth.com/force12/list/force12talk For problems with the list, contact force12@qth.com |
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