[TowerTalk] Common mode choke.

[Mike Reublin NF4L]

Thanks, Joe.

3 of the lines go to a switch on the tower. Would a choke on the single line from the switch to the shack be sufficient?

Mike

On Oct 9, 2014, at 4:20 PM, Joe Subich, W4TV <lists at subich.com> wrote:

> 
> Since 1/4 wave slopers use the *tower* as the ground return, you will
> almost certainly need a second common mode choke at the base of the
> tower.  Any antenna current on the tower will be coupled to the
> feedline where it runs parallel to the tower.
> 
> In other words, if you are using a shunt fed tower, 1/4 wave sloper,
> N4KG reverse fed ground plane, etc., place common mode chokes on *all*
> feedlines *at ground level where they leave (the vicinity of the tower.*
> 
> Even on a grounded tower, the feedlines strapped to/or running parallel
> have antenna currents both capacitively coupled to, and induced on the
> outside of the coax shield.
> 
> 73,
> 
>   ... Joe, W4TV
> 
> 
> On 2014-10-09 3:01 PM, Mike Reublin NF4L wrote:
>> I wrapped the coax for my 1/4 wave slopers thru 6 toroids. The bundle hangs so it touches the tower. Zat OK?
>> 
>> 73, Mike NF4L
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