[RFI] Wired vs Wireless Routers for RFI

Wes Attaway (N5WA) wesattaway at bellsouth.net
Fri Jan 11 11:21:28 EST 2008


What Cisco router do you have?  I have a Cisco ASA 5505, which is a fairly
standard PIX-class box.  I have not noticed any noise, but maybe I just
haven't listened closely enough.

The 8-port router, DSL modem, wireless Access Point, and KVM-switch sit
about 2-feet from my Orion.  I use standard CAT-5 cable and do not RFI
chokes on anything except the various power leads.  I don't notice any odd
noises in the Orion.

Tell me what birdies to listen for and I will check to see if I am missing

----------------- Wes Attaway (N5WA) ------------------
 1138 Waters Edge Circle, Shreveport, LA 71106
         (318)797-4972(office) -- 393-3289(cell)
Computer Consulting, Forensics, Data Recovery
-------------- EnCase Certified Examiner --------------

-----Original Message-----
From: rfi-bounces at contesting.com [mailto:rfi-bounces at contesting.com] On
Behalf Of Paul Christensen
Sent: Friday, January 11, 2008 9:56 AM
To: Jim Brown; rfi at contesting.com
Subject: Re: [RFI] Wired vs Wireless Routers for RFI

> "The biggest problem with using shielded CAT5 for this purpose is
> that for much of the equipment we are connecting, it isn't easy to
> find a suitable connection point for a cable shield..."


I continue to battle the same problems here.  I have a business-class Cisco 
router without about a dozen unshielded CAT-5 cables connected to various 
PCs and devices around the house.  I just purchased a box of 0.750" 
Fair-Rite #31 core material and the result is that router birdies are 
somewhat reduced, but still very annoying.  Half the battle with CAT-5 cable

is in getting enough windings on the core without running out of room. 
Adding cores on the PC end seems to offer little befit, so it would appear 
that the majority of the RFI source is coming right out of the router.

Any suggestions from here?  Going to an all wireless WiFi network here is 
not an option at this time.

Paul, W9AC 

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