[AMRadio] Strange interference

SBJohnston at aol.com SBJohnston at aol.com
Sun Jan 2 03:20:21 EST 2005

The cases of raspy or otherwise modulated, periodically-spaced interference 
up thru the HF spectrum that I've tracked were caused by either computers, 
monitors, or other equipment with *switching* power supplies.  The supplies were 
the culprit...  

Touch-control lights can also cause similar harmonically-related signals but 
the ones I've hunted were unstable unmodulated carriers.

I've noticed that more and more of the "wall-wart" AC adapter supplies coming 
out now are little switchers and make a lot of racket in the HF bands.  

Steve WD8DAS

sbjohnston at aol.com
Radio is your best entertainment value.  

More information about the AMRadio mailing list

This page last updated 24 Feb 2018.