[AMRadio] Telephone Wiring RFI Treatment

fralom at comcast.net fralom at comcast.net
Sun Dec 17 19:22:52 EST 2006

At work, we've had some success with K-Com filters, both wired and plug-in.
 -------------- Original message ----------------------
From: "Mike Duke, K5XU" <k5xu at jam.rr.com>
> 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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