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Steve - www.ukspeedtraps.co.uk wrote:
Thanks for that, so a 1/4 wave does not need a counterpoise then? Strip 1/4WL of insulation from the coax. Fold the outside braid back along the coax. That will leave you 1/4WL of center conductor exposed (you can leave the center insulation in place) and the braid will provide the other half of the antenna which should be insulated to avoid backpacking RF burns. Kraus calls such a "vertical 1/2WL sleeve antenna. On edge it looks like: -------------------+ -------------------------------+ 1/4WL ================================================== == -------------------------------+ -------------------+ 1/4WL -- 73, Cecil http://www.qsl.net/w5dxp |
#2
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![]() "Cecil Moore" wrote in message m... Steve - www.ukspeedtraps.co.uk wrote: Thanks for that, so a 1/4 wave does not need a counterpoise then? Strip 1/4WL of insulation from the coax. Fold the outside braid back along the coax. That will leave you 1/4WL of center conductor exposed (you can leave the center insulation in place) and the braid will provide the other half of the antenna which should be insulated to avoid backpacking RF burns. Kraus calls such a "vertical 1/2WL sleeve antenna. On edge it looks like: -------------------+ -------------------------------+ 1/4WL ================================================== == -------------------------------+ -------------------+ 1/4WL -- 73, Cecil http://www.qsl.net/w5dxp In that case I do that, and feed it all up the inside of the top element of a fishing pole I also use for SOTA work with a small beam. I can then seal it in with aradite. Thanks again Steve |
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