On 4/29/2011 11:14 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
That's just about the same as I did with the "plumber's delight"
construction except with a larger tower I mounted it farther out giving
me about 340 degrees of swing.
Limit switches can be programmed as in the Blue Heron(sp?) controller,
or they can be mounted externally on the tower leg so the arm will
contact them before physically contacting the tower. You do have to
remember to allow for the coast in the arm. With a little imagination
they can also be mounted externally on the rotator mount.
There is also the "ring rotator"
73
Roger (K8RI)
> 73,
> Clay W7CE
>
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