[TowerTalk] Ring Rotator and Tribander? Advise sought

[TexasRF at aol.com]

If you scale this scenario to 2 meters, it is similar to using a 1.8 inch  
o.d. mast to support and rotate a beam antenna. This is done all the time with  
no apparent problem.
 
73,
Gerald K5GW
 
 
 
In a message dated 3/16/2009 5:16:58 P.M. Central Daylight Time,  
john at kk9a.com writes:

Why  would the tower interact more with a tribander any more than a  
monobander?  I have used ring rotators on 10m, 15m and 20m with much  larger 
tower than you're using with great results.

John  KK9A



To: 'towertalk'  <towertalk at contesting.com>
Subject: [TowerTalk] Ring Rotator and  Tribander? Advise sought
From: "Roger (K8RI)"
Date: Mon, 16 Mar 2009  16:15:01 -0400


I tried this about 15 hours ago, but it's not shown  up so I'll try
again. My apologies if it shows up twice.

I know  we've had several discussions on "Ring Rotators", but I haven't
found  anything on using them with tri-banders.
I'd like to mount my TH-5, or 6 or  new large 30-10 multibander just
above the second set of guys, (~70') but  I'm limited to size for guy
clearance.  (I'm using Phillystran) I have  my doubts about interaction
with the 45G which is a pretty good size chunk  of steel stuck up through
the antenna. Has any one on here tried this, or  modeled it to see what
the effects are on the antenna.  I'd expect  some degradation, but how
bad could I expect? Is it even worth  trying.   That'd free up the top of
the tower for something on 40  along with the 7L C3i 50 Hz Yagi.

73

Roger (K8RI)  

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