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 [EMAIL PROTECTED] http://www.qsl.net/wd8das --------------------------------------- Radio is your best entertainment value. ---------------------------------------
