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Counterpoise for an end-fed wire antenna
You are correct. I should NOT have given a simplified response to a
simple question. Your technical answer is a much better response tho I suppose I could have made mine as technical so that he would not ask questions any more! Good point about common mode. That should screw him up as well as other things that you inserted with respect to how does one connect to an antenna. We could ask him I suppose how many wires he intends to connect to his intended antenna feed point, and if it is not two then question how he intends to measure the impedance for matching purposes. Yup, I could have done a better job. Art, See the original post asking: "How to route feedline from dipole". If he were to let his coax hang straight down from the feed point, there would be no discussion. In asking about dressing the coax along one of the dipole legs, Common Mode currents are induced on the outside of the shield and there is no longer a simple discussion. His further questions arise out of trying to deal with that problem of not being able to let his coax hang where it wants to. Also, one leg of his dipole will be over the roof and the other in the clear, so one leg will be detuned to throw more trouble into the mix. To get him on the air quickly, a tuner is desirable. If he has that, he might as well make a multi-band antenna where his feed point location is elsewhere. I think he got that because then he asked about counterpoise and ground, which is the next step in the evolution of that type of system. This is a specific technical problem. |
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