Add some .001 mfd capacitors across audio lines, such as at the radio
and at the voice keyer card. Also at the power supply line and load
terminals. Use disk ceramics, tiny low voltage ones for the audio, more
sturdy and higher voltage for the power line.
Add a second ground rod spaced a rod length from the first one. Make
that second rod at least 8 feet long. No RS ground rods need apply.
73, Jerry, K0CQ
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