[AMRadio] Telephone Wiring RFI Treatment


Mike Duke, K5XU k5xu at jam.rr.com
Sun Dec 17 13:56:39 EST 2006


Here's one for those wishing a break from the current hot topic!

I need to do some maintenance on the telephone wiring in my house in order 
to cure a hum that is now constant on all phones.

While I'm at it, I'd like to take appropriate measures to eliminate, or at 
least reduce the rfi that occurs whenever I operate on 80 or 40 meters with 
any mode.


Which ferrite beads or filtering should I use, and should I place any such 
devices on the house side of the entry box rather than, or in addition to at 
the connection point for each phone?

The rfi was present before the hum appeared, so I doubt curing the hum will 
cure the rfi, although it certainly might at least reduce it.



Mike Duke, K5XU
American Council of Blind Radio Amateurs





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