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Re: [TowerTalk] RF Quiet Router

To: "Tower Talk List" <>
Subject: Re: [TowerTalk] RF Quiet Router
From: "Jim Brown" <>
Date: Sat, 02 Sep 2006 08:25:56 -0700
List-post: <>
On Sat, 02 Sep 2006 07:55:44 -0500, John. wrote:

>Looking for a recommendation on a  *RF Quiet Router.

I'm not sure that there is such a thing. It's a combination of the laws of 
physics and the laws of economics -- that is, the circuitry will produce the 
trash, it costs money to suppress it, and the vast majority of consumers 
only buy on price. If you hear about one a lot of folks, including me, would 
like to know make and model. 

The trash is radiated two ways. First, from the cables, mostly as common 
mode. Ferrites will suppress a lot of that. See the tutorial applications 
notes on my website.  Second, the trash 
is radiated directly by internal wiring of the equipment itself because it 
isn't shielded. For that, I recommend the bucket treatment. 

Note also that all ethernet equipment, including routers, communicate with 
other ethernet equipment, and BOTH ends have transmitters that generate 
noise, so both must have their noise suppressed. This includes, for example, 
the computers and printers that are attached. This is one reason that 
wireless networks are finding popularity in ham stations. The wireless 
protocols can be a PITA, but there's less wiring to radiate trash. 

**  The bucket treatment: Fill a bucket with water. Put the offending device 
in twice. Take it out once.


Jim Brown K9YC


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