[TowerTalk] Rohn 45 Question

[john at kk9a.com]

Personally I see no reason for a second bearing and I see a huge headache 
trying to line up a top bearing, middle bearing and a rotator on something 
built as unprecise as the Rohn mounting plates.  Your rotator already has 
thrust bearings and it should easily accommodate the side forces at the 
bottom of the mast if it's properly sized.

John KK9A


To: "Dick, W1KSZ" <w1ksz at earthlink.net>,"TowerTalk" 
<towertalk at contesting.com>
Subject: Re: [TowerTalk] Rohn 45 Question
From: "jeremy-ca" <km1h at jeremy.mv.com>
Date: Sat, 25 Aug 2007 10:42:08 -0400
List-post: <mailto:towertalk at contesting.com>

Put the thrust bearing on a 45AG4 top section; the holes are already there
for that purpose.

Use a second bearing on a redrilled rotator shelf where the rotator would
normally go and put the rotator at the bottom of the section if you have a
large array. I do this even on 25G for a large stack of VHF yagis. It saves
thrust bearings and rotators as well as makes removing them or dropping the
mast a lot easier.

Carl
KM1H