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
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