High SWR on 10M with EF Quad

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  • October 24, 2015 at 3:51 pm #1209
    kiheiman
    Participant

    I have my EF Quad strung from the top of a pine tree down to the corner of my patio roof. The SWR is about 1.1 on 40M, 20M, and 15M in the center of the phone band. On 10M, at 28.5 Mhz, the SWR is 3:1. The resonant frequency is about 29.5 Mhz. That would seem to imply that the 10M stub needs to be lengthened. Is this normal?

    73
    Clint

    October 31, 2015 at 11:04 am #1236
    kiheiman
    Participant

    I added a 9″ piece of wire to the existing 10M stub. That brought the resonant point down to 1.8 SWR. The 2.0 SWR points are now 28.3 Mhz to 28.9 Mhz. I am still curious as to why the SWR would not be lower. I checked the other 3 bands and they are still about 1.2.

    73
    Clint

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