[AMRadio] Telephone Wiring RFI Treatment

Stevan A. White w5saw at pathwayz.com
Sun Dec 17 22:22:44 EST 2006

Try www.sandman.com.  Best site I know of for telephone related anything!

Also make sure you still have your twisted pair leads twisted all the way up
to their terminations and no phone wiring running parallel to power lines,
TV & satellite cables, etc.  Any place you have to cross other wiring with
phone lines, run them perpendicular to each other.  Said another way, make
sure telephone lines are run with up-to-date Category 3 or better twisted
pair wire and cross other wires and cables at 90 degree angles.

Best Regards,
Steve White, W5SAW
SW Commercial Electronics
mailto:w5saw at pathwayz.com

"Whenever we're afraid, it's because we don't know enough. If we understood
enough, we would never be afraid."  -- Earl Nightingale

-----Original Message-----
From: Mike Duke, K5XU [mailto:k5xu at jam.rr.com] 
Sent: Sunday, December 17, 2006 12:57 PM
To: Discussion of AM Radio
Subject: [AMRadio] Telephone Wiring RFI Treatment

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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