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Thread: Trial Run Results for Three Types of Whip Antennas

  1. #11
    Captain abcd567's Avatar
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    Sep 2013
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    Toronto CYYZ
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    2,719
    @majo:
    In antennas, there is a phenomenon called "end effect". Due to this effect the physical length of antenna is slightly shorter than its electrical length by about 97% to 98%. This is mainly due to radio waves travelling slower in metallic wire than in the air, and also due to capacitance effect at the ends of the antenna.

    Taking an average figure of 97.5%, the physical length of full wave wire is 275x0.975=268mm, and 1/4 wavelength wire is physically 1/4x268=67mm
    Last edited by abcd567; 2016-07-11 at 21:00.

  2. #12
    Flight attendant majo's Avatar
    Join Date
    Nov 2014
    Location
    Bremen, Germany
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    56
    @abcd567:
    Thank you for this quick and competent reply!
    Now I`m confident and can start cutting...

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