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Re: [TowerTalk] Rotator mast mount

Subject: Re: [TowerTalk] Rotator mast mount
From: Clay W7CE <>
Date: Fri, 29 Apr 2011 08:14:07 -0700
List-post: <">>
On 4/28/2011 10:31 AM, K8RI on TT wrote:
> On 4/29/2011 12:25 AM, Guy Molinari wrote:
>> Anyone have any recommendations for mounting a Ham IV atop a 2" mast 
>> section.    I'm building a standoff mount on one of my towers for a 3 
>> element SteppIR.   I've got some 2" angle iron that I'm going to bolt in 
>> place of 2 sets of steps on my AB-105 tower.   This will allow for about a 
>> 4' piece of mast held about 10-12" from the tower.
>> Now I just need to track down a mount for the Ham IV.   I should get about 
>> 100 degrees or so of azimuth.   Together with the 180 feature of the SteppIR 
>> it should do the trick for JA/CA mults and for keeping the US off my QRG 
>> when I've got the big boys pointed at EU.
> I would strongly suggest a thrust bearing be mounted above the Ham IV
> even though side mounted.  The SteperIR would be a heavy load on the
> rotator at the top of a tower, let alone on top of a 4' mast to add
> leverage.
> 73
> Roger (K8RI)

I agree with Roger.  the 3el SteppIR is a lot of wind load for a Ham IV 
without a thrust bearing.  Look at the W9IIX RM-16 Antenna/Rotor mount 
for an idea of how to do this:

Clay  W7CE


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