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In the case of this nearby AM station, I'd like to know exactly what they did that it could not be a problem,
then suddenly it was, and just as suddenly it was gone.
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Probably went out to the transmitter and did some 'Percussive Testing and Diagnosis'.
I lived in a trailer park once, was told that I was causing interference to one of the neighbors.
Kinda funny how that could have been happening considering we were gone for the weekend.
I think it was probably a neighbor with a electrically noise vacuum cleaner or mixer.
Or the fact that she was a crazy cat lady, probably that.
We have a licensed 100W(erp, TPO is 58W) FM broadcast transmitter at our home.
Antenna is about 100' from my scanner antennas, every once in awhile we can hear the
programming coming thru one of our scanners at a very low level
when it is squelched. Getting into the audio circuit somehow.
That is even with a FM band notch filter installed with the notch centered on our carrier frequency.
Being intermittent in nature, I wonder if it comes and goes depending on what is
turned off or on in the house.
House wiring coupling RF energy better or worse depending on wire length.
Other then that, no issues, well except for the RTL SDRs, poor broadbanded things get
creamed when tuning around the FM broadcast band.
If you ever need a plug and play options for MW broadcast interference,
Kiwa Electronicssells a nice filter. Can even order them custom built with a notch on that carrier
frequency that you have issues with. Used to work for Kiwa when they were in Yakima WA.
One of our customers was a ham operator that was next door (as within 100yrds) to a 50kW AM blowtorch.
Craig built his filter with one of the notches on that carrier, took care of the issue and
the customer was able to use the 160m band with no interference with the filter in place.
There are ways to filter out the RF energy by installing inductors and capacitors on the
affected devices. I don't know the power level so don't know if you are in the blanketing
coverage of that AM transmitter. Be nice and their radio tech will more then likely be happy
to help you figure out how to filter your equipment so that it can function correctly.
I lived next door to a 1kW station once, for some reason my coax had a real nice charge on it when
disconnected, frequency counter said it was the next door transmitter. I don't know, could have been
charging it up somehow. Nothing like my 160m full wave loop antenna during a blizzard with almost to cold to snow, snow storm. Ouch! Found out where the arcing was coming from inside the MFJ tuner when I
disconnected the coax and touched the connector wrong.. Neon bulbs are your friend.