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

[GARY HUBER]

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