[RFI] Computer birdies

Roger (K8RI) k8ri at rogerhalstead.com
Tue Jun 26 11:38:09 PDT 2012

On 6/26/2012 10:24 AM, Jim Brown wrote:
> On 6/26/2012 7:16 AM, Steve wrote:
>> Anyone ran into this kind of thing before? Advice as to how to rid
>> myself of these unwanted signals?
> It's the Ethernet stuff related to the router.

It's a growing problem as more and more people install home networks. 
Some of these routers are really nasty and can be heard for hundreds of 
It's relatively easy to cure with Jim's approach in most cases, but when 
it's one, two, or three houses down the street it gets a lot more 
complicated.  It's rare, but I'll swear that some of these routers need 
to be put in a grounded metal box.

I hear some weak ones but none from my own network. They're just strong 
enough to make weak signal work difficult.


Roger (K8RI)

>   The cables are acting as
> transmitting antennas, your ham antennas are receiving the noise.  The
> solution is multi-turn ferrite chokes on each of those cables. Five
> turns on a #43 or #31 core will make a nice dent in the noise.  See
> http://audiosystemsgroup.com/RFI-Ham.pdf  for details, and for part
> numbers and vendors for suitable ferrite cores.  EVERY cable can radiate
> the noise, including the power cables, so every cable should be choked.
> 73, Jim Brown K9YC
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