AmateurRadio.com

Courtesy: http://tomthompson.com/radio/projects.html

In response to an earlier blog about my recent neighbourhood noise problem, Matt (W1MST) , has passed along an interesting link to one ham's solution to a grow-op light source noise. Although I don't necessarily advise taking the same approach, W0IVJ's unique engineering skills may also provide an answer to some other amateur's noise problem, be it any type of ballasted noise-emitter. The rest of his website is well worth a close look as well.

Another type of noise problem was addressed in a posting to the topband reflector today by Don, WD8DSB.....the noise coming from a treadmill's, PWM speed-controlled DC motor.

" For many years my wife's treadmill caused strong interference on 160 meters when it was in use, and yesterday I was able to completely eliminate the RFI using a combination of two different filters (a commercial line filter that provides both common mode and differential mode filtering, and 14
turns of the power cord on a 2.4" OD Fair-Rite #31 mix toroid core based on
the K9YC hams guide to RFI document).

I created a simple website that documents my tests and the filters used,
and for those interested the website URL is:

http://sites.google.com/site/treadmillrfi/

The website contains a link to a video on youtube where you can actually
see the effectiveness of the filters. "
 
These two amateurs have developed slick solutions to their noise problems, but sadly, noise ingression is rising exponentially it seems and is becoming more and more challenging to mediate.