[R-390] RE: [Boatanchors] Peristent, annoying, intermittent, elusive QRN problem: help please!

[Joe Foley]

In a case like this it would be quick work to have a
radio tuned to the "noise" while turning off breakers
one at a time.

Of course, that only works if you have some idea of
where the circuit runs in the house.

Don't forget the aquarium heater!

Joe



--- John Starr <jstarr@world.std.com> wrote:
> I had a very similar situation some years ago that
> was very
> similar: persistent intermittent noise on/off like
> clockwork and
> only at night.  I eventually traced it to a electric
> warming mat
> with a bad bimetallic thermostat. Here is the story:
> 
> My wife likes to get a head-start on her garden by
> growing
> seedlings in the house.  I rigged up an insulated
> box in the
> basement that had a fluorescent light and warming
> mat.  The
> light was on a timer and the warming mat was powered
> all of the
> time.  The timer was set to mimic daylight, on in
> the morning,
> off at night.
> 
> During the day the fluorescent lamp kept the plant
> box warm
> enought so that the warming mat stayed off.  At
> night the light
> would go off, the box would cool down and the
> heating mat would
> cycle on and off.  Since the basement stayed at a
> relatively
> constant temperature, the heating mat cycle also
> stayed
> constant.
> 
> I had a devil of a time locating the source of the
> noise since
> it was being radiated through the house wiring and
> so appeared
> to be everywhere.


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