[TowerTalk] Rotor Loop

[KD0Q-Glenn]

I want to thank everyone for their comments and suggestions, both on and off 
list. It was all very helpful.

To summarize... It appears there are two approaches - coil the coax flat on 
the top plate like a watch spring, or coil the coax vertically around the 
mast like a remote TV truck mast.  The flat coil takes a top plate large 
enough to accommodate the coil or some kind of support can be added.  The 
vertical mast coil takes 2-3 feet of clear mast just above the top of the 
tower. In any case, make sure there is enough coil and clearance at limits 
of rotation.

In my case, I have 2 feet of mast clear just above the top plate and will go 
with the remote TV Truck mast coil approach.  I built a mock-up of the top 
of my tower so I could check out the fit on the ground.  At center travel, 
there are 4 turns of coax bundle with a diameter of about 9 inches.  At 270 
deg CW rotation, the bundle diameter is just under 8 inches, and at 270 deg 
CCW the bundle diameter expands out to just over 10 inches.  This keeps the 
coil inside the tower corner bolts and above the thrust bearing hardware.  I 
have barrel connectors and grounding mounts both on the mast and 3 ft down 
the tower so I can replace the coax loops as necessary.

Pics of my mock-up are at 
http://s171.photobucket.com/albums/u291/gathorne/Rotor%20Loop/

Thanks again!

73, Glenn/KD0Q

----- Original Message ----- 
From: "KD0Q-Glenn" <kd0q at traer.net>
To: <towertalk at contesting.com>
Sent: Tuesday, October 09, 2012 3:07 PM
Subject: [TowerTalk] Rotor Loop


> I'm getting ready to build coax jumpers for the rotor loop on my tower 
> using the "2-3 turns around the mast" method.  It will be a bumndle of 4 
> coax feedlines using Davis Bury-FLEX.  Does anybody who used this method 
> have pictures?  Any hints from experience?
>
> Thanks,
> Glenn/KD0Q
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