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I live about 200 yards away from an AM/FM station. It isn't very powerfull,
but it's very close. I can live with the bleed thru on the telephone and
answering machine, but my PC speakers have real strong fm signals. Can you
suggest a remedy?
There are a number of ways for the RF to get into your computer
In this case, the most likely route is from the phone line through the
modem and into your computer ,judging from everything else you told me.
Unplug the phone line from the computer and see if that fixes the
problem . If that solves the problem then one of my filters will surely
do the trick.
If not, then the actual speaker leads could be acting as
antennas and funneling the RF into the audio system.
Try disconnecting the speakers and listening on headphones with
the cord bunched up to keep it as short as possible. If that removes
the interference then you need filtering at the computer end of the
You can make a filter by winding some of the speaker wire
onto an Amidon Ferrite core (I can send you the info on which core to get
and also Amidons phone number.
If neither of these things solves the problem then possibly the a.c.
cord to the computer needs filtering near the entry point to the computer
an Amidon core filter will work here also. In difficult cases it takes
all of the above methods to solve the problem. I really suspect the
telephone line in your case however.
I hope these suggestions help. Let me know what you find out.
John K. Browne
Click on the picture for RFI filter construction.
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