VSWR video

This topic contains 1 reply, has 1 voice, and was last updated by Mike Ryan Mike Ryan 1 year, 6 months ago.

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  • #5693
    Mike Ryan
    Mike Ryan
    Participant

    The following short Youtube video provides a good understanding of VSWR, it’s importance in coaxial systems vs open-wire transmission lines.

    The video explains why a SWR meter placed close to the transmitter may look better with high loss coax vs low loss cable. Measuring the SWR right at the antenna terminals would give an accurate measurement of the true SWR.

    The benefits of a “remote antenna tuner” vs one very close to the transmitter output connector as the high SWR problem only exists on the line or coax between the output of the antenna tuner and the antenna. Keeping that line length as short as practical effectively minimizes the losses associated with the reflected waves.

    The line between the transmitter output and the input of the remote antenna tuner will have a very low SWR sucrh that power losses are consistent with the manufacturers cable loss specifications. The cable losses AFTER the antenna tuner will be greater when a high Very high SWR is present. Keeping that cable length as small as possible will help minimize the power loss.

    - Mike (K1WVO)
    Nashua Area Radio Club

    k1wvo@arrl.net
    Visit us on the web at - https://www.n1fd.org

    #5717
    Mike Ryan
    Mike Ryan
    Participant

    The attached link on “Impedance Matching 101” by Ward Silver N0AX is somewhat long, but will provide some good explanations about various antenna matching solutions. Ward has worked with the ARRL to produce a monthly series of “Hands On Radio” articles for QST magazine.

    Ward also provides a chart that explains the boundary limits for various L-Network configurations and shows how reordering the L-C components can find a workable solution (Ying-Yang diagrams). Note: the Ying-Yang image reveals the L-Network boundaries on a Smith Chart.

    - Mike (K1WVO)
    Nashua Area Radio Club

    k1wvo@arrl.net
    Visit us on the web at - https://www.n1fd.org

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