Quote:
Originally Posted by NN5I
I'd try toroids on the footswitch cord first, since you say that's the worst. Then the mike and feedline.
I don't agree that an earth ground is particularly important, which is good because it's very hard to get one in most shacks and all RVs. Earth grounds are useful for avoiding electrocution, but sometimes cause electrocution too. Earth grounds aren't generally very significant for RF unless your particular antenna requires one, and even then there are workarounds.
Many airplanes have HF radios, and I've never seen an airplane with a good solid earth ground.
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The air craft is the "ground" single point. His power supplies are most likely house grounded to the B- but I do not trust house grounds for RF because they can be pretty good antennas. A 1:1 may help also but it does matter what antenna is being used.