[TowerTalk] Running Coax in the plane of a VHF antenna

[Gary "Joe" Mayfield]

Paul,

    Running the coax out the middle is not that big of a deal.  You don't
need the ferrites, just do it at the right place.  Many of us have used
metal cross-booms for years, you just need to do it right.  The definitive
article was written by antenna guru Kent Britain, WA5VJB.  You can read the
article here:

http://www.g6lvb.com/fibermetalboom.htm

73,
Joe kk0sd

-----Original Message-----
From: towertalk-bounces at contesting.com
[mailto:towertalk-bounces at contesting.com] On Behalf Of Paul Baldock
Sent: Tuesday, November 04, 2008 3:20 PM
To: towertalk at contesting.com
Subject: [TowerTalk] Running Coax in the plane of a VHF antenna

I'm redoing my Circular Polarized Satellite Antennas and rather than 
following the rules of running the coax out behind the reflector and 
down for the 146MHz antenna, I plan to run the coax out the middle, 
between two directors and a 45degrees to them. This is normally a 
poor way to do it with the potential to mess up the SWR, gain and
circularity.

So I'm considering loading the coax with Type 61 Ferrite beads, every 
6" or so, the idea being to make the coax "transparent" to the antenna
field.

Any thoughts on this weird idea?

- Paul KW7Y

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