[CQ-Contest] CQWWSSB weird noises on 10 M and other bands

[Jim Brown]

On 11/1/2022 3:38 PM, kq2m at kq2m.com wrote:
> The other type of noise was what I'll call a "Squiggler" which was loud 
> and about 3 - 5 khz wide.

Hi Bob,

You may be hearing high order harmonics of the square waves in a 
switch-mode power supply (SMPS) which are ubiquitous -- there are at 
least a couple of dozen in the typical US home -- or some power control 
electronics, like a variable-speed controller for a motor.

Study this applications note, which ran several years ago in NCJ as a 
two-parter. It provides lots of ideas about figuring out the type of 
noise you're hearing, how to find the source, and how to kill (or 
reduce) the noise.

http://k9yc.com/KillingReceiveNoise.pdf

73, Jim K9YC