I recently traced RFI that was constant and band wide, expecially on the lower
bands, to my newly installed Trane XV95 furnace. The S-9 interference appeared
to be present whenever the "inducer" variable speed DC motor was running. I
was instructed by the furnace installer to allow motors to run continuously to
improve air circulation since an electrtonic air filter option was also
installed. The RFI was so severe that I was forced to turn off the furnace
whenever I wanted to chase DX on 160 or 80 meters. I contacted Trane customer
service via e-mail and was informed the next day they provided a kit described
as KIT14688 that could be installed by a furnace tech from the dealer who did
the initial installation. I contacted the dealer, in my case Clayton Heating
in Youngstown, Ohio, and within a week they called saying the kit was in hand
and they made an appointment for a tech to install it. The installation took
less two hours and was covered by
the warranty since this was a new furnace. The unit appeared to be a filter
in a metal enclosure and several shielded cables. The tech said this was their
third installation. I am pleased to report that the RFI on all bands has been
cut to nearly zero. There are, mysteriously, a few frequencies on 17 meters
where th RFI still is evident but nowhere else. Since I spend most of my
operating time on 160 and 80 CW this has not been a problem. I do have some
snap-on ferrites that I may install on the motor leads and will let you know if
it helps keep down the slight RFI on 17 meters. W8JV
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