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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