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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