In the years I've lived in this subdivision southeast of Houston, I've
tracked down four faulty doorbell transformers. I've found the noise
sources to be as much as a mile and a half away from my house. You don't fix
a faulty doorbell transformer; it must be replaced.
When you tell the owners that by replacing the transformer, (1) they will
have removed a really, really big fire hazard (the RFI comes from internal
arcing within the transformer windings); and (2) they will now enjoy TV
viewing and listening without the interference--don't know what the noise
will do to digital TV, but I'm sure there must be an effect.
At one location, no one was home, so I told their neighbors on each side
what was happening. They all had the interference on their TV's and radios.
When I told them how to fix it they said they'd certainly tell the owners
when they got home. The RFI went away the next day.
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