[RFI] Computer birdies

Phil na4m at arrl.net
Tue Jun 26 11:53:15 PDT 2012

Would using shielded CAT6 cables reduce the Ethernet RFI?  With or without winding around a toroid?

73 Phil NA4M

On Jun 26, 2012, at 1:38 PM, Roger (K8RI) wrote:

> 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 
> feet.
> 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.
> 73
> 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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-. .- ….- --
Phil Duff
Georgetown, TX

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