[Antennas] Rotatable Dipole questions

[Joe]

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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