[RFI] A quick Question about CMC placement

[Jim Brown]

On 6/28/2021 9:40 AM, David Eckhardt wrote:
> and the second at the shack end of the coaxial transmission line.
> 
> They are also good for keeping local RFI from the receiver.  I recently ran
> another test without / with the CMC only in the shack at the end of the
> feedline.  This time I chose 20-meters as my 450-foot long doublet just
> happenes to show less than 2:1 SWR on that band so I don't have to invoke
> the L-Network for a match.  I measured 9.6 dB less white noise (no
> suggestion of 60 Hz or harmonics) with far more signals on the waterfall
> with the CMC than without on the Icom 7300.

That indicates a problem with grounding and bonding.

73, Jim K9YC