[TowerTalk] Common mode choke.

[Joe Subich, W4TV]

Choke any lines leaving the tower.  Anything on/parallel to the
tower is part of the antenna.

73,

    ... Joe, W4TV


On 2014-10-09 4:31 PM, Mike Reublin NF4L wrote:
> 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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