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R.F. Feedback issue with FLEX-6600 and SPE Expert 2K-FA

Steve Adler
Steve Adler Member ✭
edited May 2020 in New Ideas

Comments

  • iw2clm
    iw2clm Member ✭✭
    edited May 2020
  • Mike-VA3MW
    Mike-VA3MW Administrator, FlexRadio Employee, Community Manager, Super Elmer, Moderator admin
    edited May 2020
    Hi Steve

    Thanks for sharing.   RFI and SWR are often not related.  In fact, a good SWR and a good return loss reading my actually be the opposite as it is likely your antenna is radiating as you want it to.  It usually means more RF out.  

    About 10 years ago, I got into using Chokes.  Mix 43 and Mix 31.  Lots of them.  I have them at the feedpoint of the antenna and at the radio end as well.  Having them between the Amp and the Radio is not a surprise and is in fact recommended.

    In fact, this is the document that got me going on it http://www.yccc.org/Articles/W1HIS/CommonModeChokesW1HIS2006Apr06.pdf

    And, the more chokes I added, the better I was hearing things.  My noise floor got lower which tells me the coax was picking up local noise too.  

    Welcome to Common Mode Currents and this is the way to resolve them.

    73, Mike va3mw

  • on5po
    on5po Member ✭✭
    edited May 2020

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