[Elecraft] K3S Proper Grounding

[dw]

I'm wondering if the RFI is primarily due to the condition of the coax?
If a tuner is located at the rig-side of the coax, and the coax is at
high SWR, it could possibly be a cause for coax radiation.
A test might confirm that.
Perhaps you could find a spot on 40m where the SWR is null, and no tuner
is needed.
If, at that point your RFI is significantly reduced, I would try feeding
the antenna with twin-lead to a matching network located on the roof.
That way, the coax would always be functioning as designed.
In that case, a common mode choke at the load-end of the coax might also
help to further reduce coax shield radiation.
Something to consider.
Hope you find the fix!! :-]
N1BBR




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 Bw_dw at fastmail.net