[Top] [All Lists]

Re: [RFI] Linksys Router Birdies

To: Charlie Gallo <Charlie@TheGallos.com>
Subject: Re: [RFI] Linksys Router Birdies
From: "Roger (K8RI)" <k8ri@rogerhalstead.com>
Date: Thu, 11 Mar 2010 21:50:01 -0500
List-post: <rfi@contesting.com">mailto:rfi@contesting.com>

Charlie Gallo wrote:
> On 3/11/2010 Tony wrote:
>> All,
>> What is the best method of getting rid of router birdies? ...snip...
>> Tony -K2MO
> I did something SLIGHTLY different than most - I used a Type32 ferrite, but I 
> used a fairly small one - 1/2" inner, about 3/4" long, which will NOT fit the 
> RJ-45 plug through it, so I cut them off, put 3-4 wraps (as many as would 
> fit), and put a new end on (I usually make my own cables, so this was no big 
> deal).  
To save some work they make snap one, or clamp on ferrites  an inch or 
inch and a half long. They come large enough you might be able to get 
three turns though one. The ones I have are about an inch long and will 
only take two turns.
> One interesting thing I found - MOST of the RFI was NOT coming from the 
> router end of the cable, but from the PC end!  MUCH greater reduction in 
> signal if I put the ferrite on the PC end.  Of course, I ended up doing BOTH 
> ends.  My birdies went from S9 to about S1, which is my background level on a 
> GOOD  day (on a BAD day, I have S7 background from DC to daylight here)  (my 
> antenna is a DX-EE 20ft or so straight up over my shack)
I've been very lucky, with the router, modem, and switch, only about 3' 
from the one station, but about 30' from the 160 and 75 antennas. A 
number of the coax runs and CAT6 run together for close to 30'. On the 
other end of the CAT6 runs are two quad core computers with the core 
speed at 3  and 3.2 Gig. They are all running on a Gigabit network.  Now 
I'm getting ready to update routers which with the reports I hear always 
makes me nervous. Some of the new routers are pretty fussy and I run 3 
different operating systems, on 5 computers with a total of 3 different 
motherboards and 5 different video cards (most top end).  So far I've 
not needed any of the ferrites on network or power cables. I hope that 
doesn't change with the new router. The old one has led a hard life and 
is not much more than a circuit board with connectors along the edge.


Roger (K8RI)
RFI mailing list

<Prev in Thread] Current Thread [Next in Thread>