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O.M.'s
when i started the radiohobbythe first trx was a WO II .set A kind of superreg with amplifier double use of the tubes rx superreg and tx superreg tube used as a vfo and the lf tube was the tx final the antenna was simple a length of wire tuned by a bicyclelamp.tuning a knob and the lamp glowed.the knob simply moved a piece of pulverized iron in a coil some years later i used a fishing rod i wound a length of wire around it one end to ground and feeded by an alligatorclamb.I hope youm understand that at the ground end there was a coil so the antenna was a kind of baseloaded with the fishingrod antenna you got a cheap and simple experimental antenna type i used tapped coil +length of wire taped coil and a coil in the centre and taped coil length of wire and an coil at the top with some radials I discovered that a grounding sistem is important However 60 feet of tuned wire is not easy and a cupperpipe stroked in the ground to the waterlevel is expensive An antenne is simplifyed a inductance and a capacity coil and condensator that will resonate on the working frequency for matching the trx you may divide the coil or condensor a cooking recept for an antenna can not be given because the circumstances are not the same and unpredictable only a few directions now to days fishing rods are made from grafite so conductive when obtainable use glasfibre rods you also find a lot of information at the foxhunting groups at larry's site sm0 vpo his balcony antenna a lot of succes when experimenting 73 de Ruud PA 0 RAB ( rare antenna builder) "Bill Horne" schreef in bericht ... I've been using an inverted vee for 80 meters, with mediocre results. I'm willing to experiment with other designs and I like the simplicity of verticals, but I've got to get something up before the weather turns, so if you've used a vertical on 80 meters, please answer these questions for me. 1. Performance? 2. Is noise worse/better/the same? 3. Is a quarter-wave radiator essential, or can it be shorter? 4. Loading/tuning? 73, Bill W1AC -- Bill Horne (Remove QRM from my address for direct replies.) |
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