[TowerTalk] Rotator mast mount

[Clay W7CE]

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:

      http://www.w9iix.com/ii00012.htm

73,
Clay  W7CE