There is no true "ground" for RF fields. Only returns. The space station
doesn't require a "ground" for comms to/from earth stations. The Crab
Nebula does not require a "ground" to fill deep space with copious amounts
of RF energy. I disagree with your statement: " That indicates a problem
with grounding and bonding ".
There is absolutely no way I could establish an adequate "ground" in my
decaying upper Permian / lower Triassic mudstone. And, what's more, I do
NOT have "RF in the Shack". Any good installation should have a lot of RF
in the shack if the antenna is operating as intended, just not experiencing
RF 'bites'.
Dave - WØLEV
On Mon, Jun 28, 2021 at 11:15 AM Jim Brown <jim@audiosystemsgroup.com>
wrote:
> 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
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--
*Dave - WØLEV*
*Just Let Darwin Work*
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