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I think what you have done by adding an additional balun/choke has made the gainmasters built in choke less effective, therefor allowing for CMC's to be present on your coax shield.

The number of turns on the GM choke has been "tuned" for best performance on 27MHz and you have effectively wound more turns on and detuned it by adding more series L to the shield with the extra balun/choke. More turns is not always "better".

If changing jumper length changes SWR readings then you have CMC's present.

I would remove the feedpoint choke you have added then try again. I have a homemade 1:1 balun at my radio and makes no difference if I plug my homemade gainmaster inline with the balun or direct to the radio.

[QUOTE="26OD004, post: 786552, member: 56348"] I think what you have done by adding an additional balun/choke has made the gainmasters built in choke less effective, therefor allowing for CMC's to be present on your coax shield. The number of turns on the GM choke has been "tuned" for best performance on 27MHz and you have effectively wound more turns on and detuned it by adding more series L to the shield with the extra balun/choke. More turns is not always "better". If changing jumper length changes SWR readings then you have CMC's present. I would remove the feedpoint choke you have added then try again. I have a homemade 1:1 balun at my radio and makes no difference if I plug my homemade gainmaster inline with the balun or direct to the radio. [/QUOTE]

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