[TowerTalk] Tower and Ladder Line Interaction

[Roger (K8RI) on TT]

On 7/24/2014 11:39 PM, Richard (Rick) Karlquist wrote:
>
>
> On 7/24/2014 7:28 PM, Roger (K8RI) on TT wrote:
> ve read suggests otherwise.
>>>
>>> Since you said you are using a tuner, you don't care if the line
>>> impedance is changed moderately by the proximity of the tower.
>>> You are probably fine if the spacing to the tower is 2 or 3 times
>>> the wire spacing of the line.  Try to keep balance by putting
>>
>> Twist it!  Ladder line, TV ribbon, parallel wires should be twisted.
>
> Twisting the wire will not prevent the proximity to the tower
> from lowering the impedance (it will always be lowered).
> Not that it matters.

That not twisting will, or can drastically change the balance between 
conductors does matter though for pick up of noise/interference and 
inducing RF current in things other than the tower.  If those other 
things have a rusty bolt or joint uit can lead to RFI.
>
> Rick N6RK


-- 

73

Roger (K8RI)


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