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Ground Plane SWR 53 Bayous:

Discussion in 'CB Antennas' started by Jay in the Mojave, Dec 15, 2003.

  1. Jay in the Mojave

    Jay in the Mojave Active Member

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    One more thing, that when that 1/4 ground plane is working you will a good bandwidth to it



    Jay in the Mojave


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  2. 53 bayous

    53 bayous Guest

    Thanks, Jay...I will do just that<img src=http://www.ezboard.com/intl/aenglish/images/emoticons/happy.gif ALT=":D">


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  3. Jay in the Mojave

    Jay in the Mojave Active Member

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    Hello 53 Bayous:



    I put your ground plane element lengths into my antenna modeling program, Eznec 3.0.



    It showed the antenna working around 29 Mhz at 10 feet above the ground, and at 27.25 at 30 feet above the ground.



    This indiates that the mast is significantly radiating, and will cause differences with in the SWR and operating frequency, with different mast heights. So the short ground Plane radials of 4 1/2 Feet are not working.



    Suggest you try what is known to work, with all the vertical and horzona elements a 1/4 wavelength long.



    Let us know how it works out.



    Jay in the Mojave



    www.a1antennas.com


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  4. Jay in the Mojave

    Jay in the Mojave Active Member

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    Hello Bayous:



    Good Morning, Oh four hundred here, way to early, heheheheh



    As Moleculo said here, experimentating around is half the fun, of course its also a FCC rule to listen to Rock n Roll, or Country & Western, right? I am sure it is!



    Yes the ground plane radials need to be 1/4 wavelength long, and adjustable so that they can be adjusted to where you want them to work. By adjusting the ground plane radial lengths, will change the antennas operating frequency!

    Just as the vertical element, which also has to be a 1/4 wavelength long.



    When the ground plane radials are working correctly, the differenent antenna heigth, will only slightly change the antennas SWR.



    If no ground plane radials are used, then the outter coax will radiate, and again different SWR values will be seen with different mast heigths.



    You may want to try a choke, made from 6 turns of coax around a 6 inch diameter, taped into a nice straight and even coil, that is a 1/4 wavelength down from the antennas connetor.



    But please let us all know what your results are!!



    Jay in the Mojave


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