Re: [IRCA] Electrical QRM question
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [IRCA] Electrical QRM question



What I often do is "sweep" the house with a portable radio, moving from room to room, outlet to outlet, and device to device looking for the offending source. I concentrate on anything that's plugged in (lights, appliances, etc.) In every case I've been able to find the problem this way. Most often it's turned out to be some "new" gadget that I didn't think would cause QRM (external harddrive, UPS, lamp dimmer, even an electric toothbrush).

Brett Saylor




It sounds like the QRM is coming from a defective device with digital control logic. The device enters a state that causes QRM, then when you turn power off then on, it resets the device back into a known good state. Or, it could be the defective device's power supply.

Next time the QRM happens, power off a section of your house at a time while monitoring the QRM. When you find the circuit the offending device is on, you narrowed down your search. Or, you could unplug everything in your house one device at a time while monitoring the QRM. 73.

Chris Knight
Fort Lupton, Colorado


I once again experienced massive buzzing all around the house. It seemed stronger near various things like lights and light switches, etc... and when I turned off the main power switch and then turned it back on, the noise went away. This happened last time, a few months ago, too, and the same trick worked.

My question is - for anyone here who knows about such things - what might be going on to cause the QRM, what am I doing when turning the main power off and then back on, and most importantly is there anything I should be telling my elecrician?

Saul


_______________________________________________
IRCA mailing list
IRCA@xxxxxxxxxxxxxxxx
http://montreal.kotalampi.com/mailman/listinfo/irca

Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers

For more information: http://www.ircaonline.org

To Post a message: irca@xxxxxxxxxxxxxxxx


_______________________________________________
IRCA mailing list
IRCA@xxxxxxxxxxxxxxxx
http://montreal.kotalampi.com/mailman/listinfo/irca

Opinions expressed in messages on this mailing list are those of the original contributors and do not necessarily reflect the opinion of the IRCA, its editors, publishing staff, or officers

For more information: http://www.ircaonline.org

To Post a message: irca@xxxxxxxxxxxxxxxx