[RFI] Computer birdies

EZ Rhino EZRhino at fastmovers.biz
Tue Jun 26 16:46:38 PDT 2012

I have wireless internet....dish on the roof pointed at a tower across the valley, and ethernet cable from the dish to my router, with a "power injector" inline.  I had the same issues reported here.  The internet provider lead tech guy changed the speed to 10mb (this was a change on their end, not my equipment) and the birdies went away.  


On Jun 26, 2012, at 15:27 , Richard Battles wrote:

Change the ethernet speed to 10mb half duplex and the birdies will go away.
if the router is wireless and the modem is connect by cat 5e, again switch
to 10mb half duplex,  i have not tried cat6 yet.


On Tue, Jun 26, 2012 at 3:56 PM, Phil <na4m at arrl.net> wrote:

> On Jun 26, 2012, at 2:45 PM, Jim Brown wrote:
>> On 6/26/2012 11:49 AM, charlie at thegallos.com wrote:
>>> I personally found, with my router and computers that the computer was
> the really bad end, but putting cores on both ends helped too, as there was
> some low level stuff coming from the router
>> Yes. Each end of a cable connected to ANY digital electronics should be
>> viewed as a potential noise source, but as several have noted, some
>> products are much noisier than others.
> As a quick check/test I found some likely Ethernet RFI crud close to
> 50.120 and 3.770.
> Shut computer down - 50.120 E'net crud stops as computer shuts off.
> Disconnected E'net cable from computer & router then powered computer back
> up and switched it over to it's wireless interface.
> 50.120 & 3770 crud still gone.
> With the availability of reasonably  priced wireless routers along with
> plugin wireless adapters for computer ethernet and USB ports not sure why
> it makes sense to still fuss with using wired Ethernet networks in
> home/shack and then need to install toroids, shielded cables, etc. to rid
> the radio of Ethernet RFI crud.   Maybe one short e'net cable needed
> between the router and upstream cable/DSL/etc. modem and thats it.
> 73 Phil NA4M
> -. .- ….- --
> Phil Duff
> Georgetown, TX
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