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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