[RFI] Re: rfi-digest V1 #17

James L. Keyes James L. Keyes" <jkeyes@mtnhome.com
Fri, 30 Jan 1998 10:40:24 -0600

>From rfi-digest V1 #17
> Date: Thu, 29 Jan 1998 19:32:22 -0500
> From: Jeff Otterson/N1KDO <otterson@mindspring.com>
> Subject: [RFI] telephone system RFI
> Hi,
>   I have an old Northern Telecom key system in my house.  It is the source
> of lots of RFI.  I isolated the RFI to the phone system by switching off
> breakers, then pulling plugs on the troublesome circuit until I found the
> culprit.
> Here's what I have done so far to try to rid myself of the RFI...
>   1) Disconnected telephone CO and set lines from the central control box.
> no change in the RFI levels.
>   2) Grounded cabinet of control box, and put a pair of the snap-together
> type regtangular ferrites on the CO & set lines, and the AC power line.  No
> change.
>   3) made sure the cover was screwed on tight, and that there were good
> clean connection points between the front and back covers.
>   Any ideas are appreciated...
> Thanks.
> Jeff
> Jeff Otterson
> - -------------
> otterson@mindspring.com
> Maker and user of tools.
> PGP key available at http://www.mindspring.com/~otterson/pgp.html

I suggest that you call 1-800-4NORTEL with your model # and serial # and
ask the tech guys for help. They have been very good at responding to
requests for repair and ideas for old gear.
When it comes to RFI, they probably have already done it!
Jim Keyes, WA1TQG
The tall, quiet guy in the Ozarks of Arkansas [NO! I never voted for

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