On 12/21/2020 4:48 PM, Gary Johnson wrote:
That’s easy. RF is picked up on the AC lines then enters any nonlinear device plugged
into those lines, such as a walk wart. There, RF is rectified, harmonics are generated, and
that’s mixed with all the garbage on the power line, then re-radiated via conducted
emissions. Many harmonics are normally expected. This is the classic problem for any SO2R or
M/M station.
Case study: At 8P5A, Tom has very little ancillary stuff plugged in and yet he
had your problem. He traced it to a single LED light. Once removed, the
harmonic garbage disappeared.
Yes. W3LPL alerted many of us to this mechanism. Another place this
occurs is the in the junction inside rotators between the top and bottom
section. The cure is to bond around them.
73, Jim K9YC
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