[RFI] QUESTION

[Jim Brown]

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