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How to bring this horizontal loop to resonance on 160m?

Discussion in 'Antennas, Feedlines, Towers & Rotors' started by 2E0ILY, Mar 25, 2019.

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  1. SM0GLD

    SM0GLD Ham Member QRZ Page

    I agree.
    I am not sure we can trust the measurements.

    So what can we do now, witch one is the correct one?
    If the loop is 460ft it is to short.
    If the loop is 564ft it is to long.
    Both cases needs a matching network of some sort.
  2. WA7ARK

    WA7ARK Ham Member QRZ Page

    Adjust the loop length. Here are the combinations that work at 1.84MHz:
    Make Loop=539.6ft, feed it with 136ft of RG8X, coil excess cable to make a ugly choke or use CMC.
    Make Loop=536.2ft, feed it with 35ft of RG8X, put 1:1 balun (or CMC) at loop feedpoint. (plot legend is wrong, it says 1:4).
    Make Loop=516.6ft, feed it through a 1:1 balun to 35ft of WireMan #552 to the loop.
    Make Loop=491ft, feed it through a 1:1 balun to 53ft of WireMan #552 to the loop.

    Last edited: Mar 26, 2019
  3. K0RGR

    K0RGR Premium Subscriber QRZ Page

    I would cheat and just add the wire to make it ~538 ft.. A loop does not need to be square, round, or any other particular shape. You can pull extra wire back in toward the center without much effect.
  4. AA5CT

    AA5CT Ham Member QRZ Page

    Cheat more - add that 'extra wire' in series to the antenna's feedpoint by winding it around a 1 gallon plastic pail and look for 'best match' (or, rather, "resonance") ...

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