[TowerTalk] Coax/Rotor Cable on the outside or inside of the tower

[Gene Smar]

Richard:

     To help ground your coax cable runs onto the tower at the top and 
bottom, as Jim suggests, you can fab up some homebrew cable ground clamps. 
I wrote up a description at 
http://lists.contesting.com/archives//html/Towertalk/2002-07/msg00698.html . 
Joe KC2TN took photos of his 
http://lists.contesting.com/archives//html/Towertalk/2007-10/msg00356.html .


73 de
Gene Smar  AD3F


----- Original Message ----- 
From: "Jim Brown" <jim at audiosystemsgroup.com>
To: <towertalk at contesting.com>
Sent: Thursday, March 29, 2012 1:24 PM
Subject: Re: [TowerTalk] Coax/Rotor Cable on the outside or inside of the 
tower


> On 3/28/2012 5:05 PM, Richard Thorne wrote:
>> I don't plan on using the tower as a loaded vertical on 160 but I would
>> at least like to keep the option open.  With that in mind does it matter
>> if run the coax and rotor lines up the inside or up the outside of the
>> tower.
>
> Inside the tower is much better. When you load the tower, skin effect
> causes RF current to flow mostly on the outside of the tower. The coax
> shield should be bonded to the tower top and bottom for lightning
> protection, and both cables should have serious ferrite chokes at the
> base of the tower, using the winding guidelines in
> http://audiosystemsgroup.com/RFI-Ham.pdf   The chokes are important only
> if the tower is being loaded.
>
> 73, Jim K9YC
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