[RFI] Computer birdies

Roger (K8RI) k8ri at rogerhalstead.com
Wed Jun 27 14:57:20 PDT 2012

On 6/26/2012 9:02 PM, Jim Brown wrote:
> On 6/26/2012 4:46 PM, EZ Rhino wrote:
>> 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.
> BUT -- there is no need to give up data rate if you use common mode
> chokes to kill the RF trash!

CAT 5 and 6 do not like tight turns, but 6 is far better than 5 with 
dividers separating each pair.
I would suggest when winding the chokes just do not try to make the 
turns nice and compact. IE, Tight to the core(s)

My 3 runs from the switch in the basement to the shop go across the 
basement ceiling, 90 degree up the plate, 90 degree turn then through 
the plate, 90 degree turn and up the wall to the ceiling of the garage, 
90 degree turn and about 35 feet across the ceiling, 90 degree turn and 
down the wall, 90 degree turn and through the wall. 90 degree turn and 
underground in PVC conduit.90 degree turn and to the shop in another 35' 
run, 90 deg turn and up the wall, 90 degree turn and through the wall 
and from there it kinda wanders about 6 feet to the computers. I had two 
of the runs that were not working. I found kinks at several of the 90s.  
replacing the 90s with sweep 90s and no kinks  cured the problems.


Roger (K8RI)

> 73, Jim K9YC
> _______________________________________________
> RFI mailing list
> RFI at contesting.com
> http://lists.contesting.com/mailman/listinfo/rfi

More information about the RFI mailing list