On 6/27/2025 5:57 PM, Howard Hoyt via Elecraft wrote:
several large Mix31 cores with multiple turns on feedlines did not
attenuate it a bit.
Hi Howie,
Some ideas.
Were these at antenna feedpoints, and wound according to my 2018
Cookbook? They are an important contributor to minimizing interstation
interference.
Might there be passive intermod present and creating these products?
Are you running power amps (for my money, a turn in the punchbowl on
FD)? Most generate significant second harmonic, and in W6GJB's county
activation trailer, we run KPA500's in two stations. Double stubs
ideally placed along the transmission lines to the lower frequency band
are required on 80 and 40 CW to kill those harmonics.
This a slide deck for a talk I did at Visalia several years ago that
collects all of the factors I could think of that affect
multi-tranmsmitter stations.
http://k9yc.com/Multi-Station.pdf
73, Jim K9YC
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