Richard,
Two issues with a Fong style J-pole are coupling to the mounting pole/surrounding metal, and proper decoupling of the feedline.? I have made slightly different variants that address these issues and have had good luck.? Any metal structures within???wave
radial distance of the stub or radiator will drastically affect tuning and pattern if proper mounting and decoupling are not done.? His kits do not take this into account and leave it to the builder to fix.? Also, using different pvc (which I do due to availability)
than the thin wall he calls out will affect tuning. All that being said, not the best antenna for side mounting on a tower or top mounting on any commercial or tall tower.? Not bad though for temp/portable operations, or top mounting on small structures or
roofs when a high gain colinear is not available.? Good luck with your project.
73,
Ron
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Thanks. I¡¯m fairly familiar with repeaters. Built and maintained three of them. Built two remote bases. Duplexed Micor mobiles. Resoldered bad copper connections inside noisy PD Stationmasters. Etc.. Just having a problem with the Fong (which, BTW, for me,
was very, very fussy to tune). I think I will just have to go back to my UHF quarter wave for the UHF/HF remote base. Hard to argue with success. And, unlike most repeaters, I don¡¯t want much coverage¡just a mile out, or less.?
Richard
