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.
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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