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Re: [TowerTalk] Rotator mast mount

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Rotator mast mount
From: Mike Fatchett W0MU <w0mu@w0mu.com>
Date: Sat, 30 Apr 2011 12:44:17 -0600
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
With a large enough gate the driven should clear the tower legs ok.  The 
30/40 driven element has the boom to mast plate in the middle of the 
element.  I'm not sure which side of the bracket the non 30/40 sits.

On 4/30/2011 12:40 PM, K8RI on TT wrote:
> On 4/30/2011 1:50 PM, Mike Fatchett W0MU wrote:
>> I would probably want to mount the rotor on a steel plate instead of the
>> mast bracket.  The 3 ele SteppIr is going to require some interesting
>> engineering as the driven element is dead center on the boom.
> Where do they put the boom to mast bracket?  That should work fine.
>
> 73
>
> Roger (K8RI)
>
>> On 4/30/2011 11:21 AM, Ed K0KL wrote:
>>> I believe the windload when mast mounted is 7#. Not a good idea!
>>>
>>> ed K0KL
>>>
>>> On 4/29/2011 10:14 AM, Clay W7CE wrote:
>>>> 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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