[TowerTalk] Ladder Line Spacing from a Steel Tower

[Roger (K8RI)]

On 12/3/2010 4:58 PM, n8de at thepoint.net wrote:
> Instead of bringing the ladderline directly down the side of the
> tower, 'twist' it as you do, thereby changing the distributed
> capacitance of the two wires to the  tower and 'equalizing' any
> capacitive problems.
> 3 or 4 turns should suffice for 50'.
>
> One foot sounds good to me, too.
I'd probably use about 1 turn per yard/meter as it's good for common 
mode rejection and the extra turns wouldn't hurt (within reason)
I have no technical basis for choosing  the number of turns/twists other 
than it being convenient and a tiny fraction of a wavelength at the 
frequencies they are likely to be used or encounter.

73

Roger (K8RI)
>
> 73
> Don
> N8DE
>
>
> Quoting W1JCW<W1JCW at hotmail.com>:
>
>> I slope mine at a 45 to a 4:1 balum, coax into the shack.
>>
>> I would think at least 1'.
>>
>> 73-
>> W1JCW
>> John
>>
>> --------------------------------------------------
>> From: "Sam Andrews"<sandrews at aristotle.net>
>> Sent: Friday, December 03, 2010 3:06 PM
>> To:<TowerTalk at contesting.com>
>> Subject: [TowerTalk] Ladder Line Spacing from a Steel Tower
>>
>>> I am going to rework my inverted vee supported near the top of the 50'
>>> tower with polyethylene insulated ladder line (300  or 450 ohm, from DX
>>> Engineering, or similar).  How far off the tower leg or face should it
>>> held?
>>>
>>> 73, Sam  AE5L
>> _______________________________________________
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