[TowerTalk] Rotor Loop - Rohn 45-G flat top section

[Wayne Kline]

Hi Gary
  There are many ways to skin a cat. My way with a flat top with  there  TB 3 thrust bearing and there protruding bolts and sharp edge, is to transition any hardline connectors below the top plate ( A good place to test the antenna and feed line from also ) 
then put the RG 231, 214  inside a reinforced 3/4" piece of garden hose.  I install the antenna in the north position 1/2  it's rotation
and  wind 2 turns  one laying on the flat top and one taped 6 to 8" above  the flat plate. most of these install's are in  the snow and ice of Eastern PA NJ NY or Dell and to the best of my knowledge there was never a frayed, tore coax with this  type of configuration.
 
Like said said there just another way  to do it ..
 
 
Wayne W3EA 
 
> From: glhuber at msn.com
> To: TowerTalk at contesting.com
> Date: Wed, 18 Sep 2013 09:28:21 -0500
> Subject: [TowerTalk] Rotor Loop - Rohn 45-G flat top section
> 
> As I prepare to replace my thirty year old, tapered top, 50 foot Rohn 45-G with a new 50 foot flat top, I’m looking for suggestions on the rotor loop configuration; 
> 
> A TH-7 with BN-4000, mounted on Rohn heavy duty, ten foot, two inch OD mast, some three feet above the bearing:  my initial thoughts are to tie the ten or six foot RG 213/U (copper braid / solid dielectric) cable to the boom and mast near the boom, then loosely spiral wrap the cable down the mast with two more spirals on the top plate, pass the RG-213 through a two inch OD – four inch long schedule 40 PVC pipe clamped to the tower leg near the top plate, tie the RG-213 to the cable leg then connect it to a RFU-520-H1 (UHF female connector for LDF4 50A) on Andrews LDF4-50A. When the rotor turns there should be no more than a half turn tightening or loosening the spiral. 
> 
> This install is in Bloomington, Illinois where winter conditions include wind, ice, snow, and sub-zero weather.  I am concerned about the RG-213 cable freezing to the top plate and being pulled apart when the TailTwister is engaged. Is this a valid concern?  I guess I could put heat tape on the underside of the rotor plate, but I think that’s over-kill!
> 
> Best regards,
> 
> CSM(r) Gary L Huber – AB9M
> 9679 Heron Bay Road
> Bloomington, IL 61705
> 
> WWW.CSM-GH.COM
> glhuber at msn.com
> 309-662-0604
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