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[RFI] Broad band Cable Modem

To: <rfi@contesting.com>
Subject: [RFI] Broad band Cable Modem
From: eedwards@oppd.com (EDWARDS, EDDIE J)
Date: Tue, 4 Jun 2002 08:58:58 -0500
I don't have much experience with these, but I'm guessing the AC power wall 
wart that most of these use needs a ferrite choke on the line feeding power to 
the modem.  If that doesn't dure it, also try one on the cable to/from the PC 
as close to the modem (in both cases) as possible.

> -----Original Message-----
> From: Elbert E. Flanagan
> Would appreciate any comments or fixes you can recommend concerning RFI
> into a neighbor's computer- a new 1.6 gigahertz. The location is within
> 50 feet of my radio hamshack.  The problem mainly appears when I run
> Radio Teletype  at low power, 50 watts or less on the 30 and 40 meter
> amateur bands. Other modes does not appear to cause the problem,  RTTY
> is a constant carrier transmission type. No problems experienced in my
> residence on TVI, telephones (including wireless) and stereo equipment.
> The cable TV company has updated all coax cables , not because of my
> problems but to be digital capable.  I understand others have had
> similar experiences.
> The external modem with AC power supply, shuts down-- no other problems
> experienced with the computer normal operation.  I have provided an EMI
> ac line filter for the modem power source which helps but not a cure..
> Thanks    W8RHS

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