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SWR meter oscillates with cavity filter?

Discussion in 'General Technical Questions and Answers' started by KM6LYW, Jan 20, 2021.

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  1. K7JEM

    K7JEM Ham Member QRZ Page

    What actual instrument are you using to get these results, and are you measuring into the cavity while it is attached to an antenna or a dummy load? And what model cavity are you using?
  2. W1BR

    W1BR Premium Subscriber QRZ Page

    I've had that happen on repeater amplifiers that did not like running into duplexers that presented
    highly reactive loads off the operating frequency; fix was to install a good ferrite isolator between the
    PA and duplexer.
  3. AI3V

    AI3V Ham Member QRZ Page

    One person that gave you advice has repaired and tuned hundreds and hundreds of "cavities "

  4. KM6LYW

    KM6LYW Ham Member QRZ Page

    on closer inspection, the mfj analyzer sends pulses of RF at about 4hz, and the needle oscillates with each pulse. I could hear the pulse on my ht.

    I hooked up an inline swr meter and it was rock steady during a normal transmission.

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