On Thu, 20 Nov 2008 22:38:04 -0600, The Daring Dufas
wrote:

Jeff Wisnia wrote:
The Daring Dufas wrote:
Bill wrote:


I had a friend some years ago who ran the communications
division of the local power company. This was back when
they had HF radios for communications and the techs actually
had to know something about electronics. They would get
electronic interference complaints which were often traced
to doorbell transformers. It was a very common problem and
one that many people don't even think of today.

TDD


Sorry, but I have a hard time believing that.

If it was "a very common problem", can you offer a cite proving that a
60 hz transformer and 10-50 feet of unshielded wire with 24 vac on it
can cause interference at radio frequencies?

Wouldn't you expect that if that story was true those big pole pig
transformers and all that higher voltage wiring running on the poles on
nearly every street would have caused the radios to melt? G

Jeff


Do you know what voltage most (USA) doorbells operate on?

TDD
I've got 3 different ones floating around - 12, 16, and 24 volts AC.
(They would work just as well on lower voltage DC)