[RFI] Computer birdies
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
> 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
>> RFI mailing list
>> RFI at contesting.com
> RFI mailing list
> RFI at contesting.com
-. .- ….- --
More information about the RFI