[Antennas] Rotatable Dipole questions

[Joe]

I forgot to add,

I did NOT mount this in a normal way as it is designed..

I mounted it INSIDE the tower  With a Thrust bearing to support ALL  the 
weight.  The rotor had to support NOTHING,, all it had to do was turn 
the antenna.

Joe WB9SBD

Joe wrote:

> Absolutely!  This Rotor will do the Job.
>
> I have been using one of these,,  must be as you say the worm gear 
> final drive The spur gear's just strip out in a week!  But reason 
> saying it will work is I have been using one of those for over 20 
> years, at 60 feet on a TV type tower, with a Mosely TA-33  Three 
> element Tribander (20-15-10)  and a pair of stacked 8 element two 
> meter beams on that rotor.
>
> The ONLY problem I ever have had with it is,  the sync between the 
> actual direction and the indicator downstairs become "Un synched"  and 
> you then need to do the go to both stops and re align them,  takes two 
> minutes, and only had to do maybe once a week.
>
> And the other problem was, in strong winds.  I never had the wind push 
> it around,  (windmilling?)  It always would be where I parked it,,  
> Worm drives are great for that,,  the problem was POWER,, On strong 
> windy days it would stall out trying to turn things against the wind,  
> as it would be swinging around it would just stop till the wind calmed 
> down some.  But it had to be a pretty stiff wind too like 30+ MPh.
>
> Otherwise it's still chugging away after 20 years..
>
> sounds like a barbecue rotisserie though,,
>
> Joe
> WB9SBD
>
> Philip Atchley wrote:
>
>>
>>
>> 2.  I plan on using an Alliance U-110 heavy duty TV rotator that I've 
>> cleaned and lubricated, and which appears to be in excellent shape (I 
>> have two of them).  Examination of the gears showed little/no wear 
>> and I've seen some very large TV antennas mounted on these critters 
>> (seemed to be the rotator of choice in this area).  The rotator 
>> doesn't have a brake, but it is worm drive to the large mast gear and 
>> I don't think the mast is going to "turn" it any.  Buying a new 
>> rotator is OUT of the budget for this project. I WILL need to replace 
>> the rubber boot and mast clamps though!
>>
>> Questions.
>>
>> 1.  Is the Cushcraft D3 (20,15 & 10M) a good choice in rotatable 
>> dipoles  from a performance/longevity standpoint?
>>
>> 2.  Is this rotator likely to hold up in this type of service?  Yes, 
>> the basic antenna is 25 feet long, but there aren't any other 
>> elements to "catch the wind".  Outside of having to buy a new rubber 
>> boot and clamps the rotators were free (the advantage of working part 
>> time in a TV shop).
>>
>> 73 de Phil  KO6BB
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>