Hello -

   Here is a quoted message that I pulled from a Reddit 'r/amateurradio' post - if you have RF in the radio shack issues this might be the solution . . .

After 3 years of fighting RF in my shack I finally fixed it in an afternoon. The answer was embarrassingly simple and I want to save you the same 3 years

"Symptoms: key clicks on transmit, audio distortion on receive, computer peripherals acting weird when I keyed up, neighbors' speaker buzzing. What I tried over three years: better feedline, better connectors, adding ferrites randomly, moving equipment around, a different ground rod, a second ground rod, reading 47 forum posts that all contradicted each other
What actually fixed it: a single common-mode choke at the feedpoint of the antenna, and a second one where the feedline entered the shack. Two chokes. Each wound with 8 turns of coax on an FT-240-31 toroid. Total cost: $18

The theory I finally understood: I didn't have a grounding problem. I had a common-mode current problem. Those are different problems with different solutions, and treating one like the other does nothing. Most RF interference in ham shacks is common-mode current, not a lack of earth ground

If you have RF in your shack and you haven't built common-mode chokes yet, start there. Before the fancy ground system, before the filtered power strip, before anything else."

de KB8MDF

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    Adam T. Cately
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