Tuning a wire antenna

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This topic contains 2 replies, has 1 voice, and was last updated by  Jason Jensen 4 years, 1 month ago.

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    Jason Jensen
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    To say that I’m rusty would be incorrect. I never had a good grasp to begin with. I have a question about tuning a wire antenna.

    I have an Alpha Delta DX-CC antenna.

    It kinda looks like this (a fan dipole with all the elements in parallel)

    —-c——————-|—————-c—–
    ————–|————
    —–|——
    (the verticle line is the feed point).

    Anyway.. I think the lengths of the wire are setup so that the longest will tune on 40 and 80 (with a coil between the lengths. It’s a shortened dipole so I think the interaction between the wires and the coils themselves help it to tune on the correct bands, even though the lengths aren’t typical.

    So out of the box it is supposed to tune 10, 15, 20, 40, and 80 (with shorter bandwidth on 40 and 80), which it does fine.

    Later after I bought this antenna and had it in use for a while, I bought a tuner that tunes anything from 6 to 3200 ohms. (SWR of up to 64:1, or so it says) That gave me the ability to tune up on 12, 17, 30, etc.

    However just recently my 30 meter will not tune. The best it can do is tune to 2.8 SWR. Nothing had happened to the configuration of the wire, and all the other bands tune up just fine. I messed with the lengths of the wires to see if I could find a sweeter spot for 30m but it didn’t seem to help.

    Is there anyone that can explain in lay-men’s terms what could be happening? It has me quite puzzled.

    Thanks.

    Jason
    K7KKY


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