Bad design. (I had one). Only bolts onto one leg. Better design is a side
mount that bolts to 2 legs. MUCH less stress on the tower legs.
73
Jim W7RY
--------------------------------------------------
From: "Clay W7CE" <w7ce@curtiss.net>
Sent: Friday, April 29, 2011 8:14 AM
To: <towertalk@contesting.com>
Subject: Re: [TowerTalk] Rotator mast mount
> 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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