[RFI] Resolving RFI to a DSL Modem

David Robbins k1ttt at arrl.net
Sat Mar 21 15:15:12 EDT 2015

The first adsl modem/router I had was real sensitive to 40m also, had to
build a custom filter for the phone line for it to keep it running...
ferrites on all the wires didn't help.  The one I have now runs fine with no
extra filters.  Unfortunately this one is a Verizon branded model 7500 so
I'm not sure who really makes it.

David Robbins K1TTT
e-mail: mailto:k1ttt at arrl.net
web: http://wiki.k1ttt.net
AR-Cluster node: 145.69MHz or telnet://k1ttt.net

-----Original Message-----
From: RFI [mailto:rfi-bounces at contesting.com] On Behalf Of Adrian Flynn
Sent: Saturday, March 21, 2015 16:06
To: Kim Elmore
Cc: rfi at contesting.com
Subject: Re: [RFI] Resolving RFI to a DSL Modem

Why not use "Snap on Chokes"?
Put as many in series as needed.

Adrian KF7DYU
On Mar 21, 2015 11:32 AM, "Kim Elmore" <cw_de_n5op at sbcglobal.net> wrote:

> I have an  ADSL modem in my garage and when I operate with anything 
> more than 1300-1400 W on 40 m only, it loses the ADSL connection. I';; 
> be getting an IPDSL modem on Monday, though not Uverse (because... 
> Well, it's the phone company). I'm assuming I'll have a similar 
> problem with it, if not worse. I've ordered five of the ~1.5" ID type 
> 31 ferrite cores, enough for one per wire that enters or exits the 
> device. How many turns should I pack on: as many as I can in a single 
> layer? ANy guess if I can get away with enough turns when I run two wires
per core?
> There's a twisted pair that enters the modem, a power line, and four 
> CAT-5 cables. DO I need to observe any special precautions?
> Kim N5OP
> --
> Kim Elmore, Ph.D. (Adj. Assoc. Prof., OU School of Meteorology, CCM, 
> PP SEL/MEL/Glider, N5OP, 2nd Class Radiotelegraph, GROL)
> /"In theory there is no difference between theory and practice. But, 
> in practice, there is." //- Attributed to many people; it's so true 
> that it doesn't matter who said it./
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