[TowerTalk] Rotator Choice for Larger Yagi

[Bob K6UJ]

Jim,

I forgot about the mast clamp in my earlier post.
I got the K7NV clamp for my OR2800 and as you say it is the real deal.
Extremely well made.

Bob
K6UJ



On 4/25/16 7:38 PM, Jim Thomson wrote:
> Date: Tue, 26 Apr 2016 00:34:00 +0000
> From: Ralph Parker <ve7xf at dccnet.com>
> To: towertalk at contesting.com
> Subject: Re: [TowerTalk] Rotator Choice for Larger Yagi
>
>> The M2 OR2800 will handle up to 35 square feet of antenna and support 1800
>> pounds. It also fits in the tower nicely because of its triangular shape.
> I've spent the last few weeks trying to pick a rotator for a new installation.
> Indeed, the OR2800 looks good, but I've read too much about water ingress,
> rust and the indifference of the manufacturer.
> Comments?
>
> VE7XF
>
> ##  I have 2 of the OR-2800s.  1st one is the older AC unit, bought new.  The AC capacitor
> inside the unit craps out, now fixed.  The  2nd one was bought used, and is the newer DC type.
> Former owner was turning a F12  340N  + a F12 C49....which is a massive array, with 4 els on 20m,
> 6 el on 15m..and  10 els on 10m..all on a 49 ft boom.  The 3 el 40m array is ona  36 ft boom, with
> 52-59 ft long eles.
>
> ## the final gears are  totally trashed !   So don’t buy into the XXX  sq ft nonsense.  Part of the problem  is the
> arrays are NOT Torque balanced.   The worm gear concept is fine.... BUT IMO, the worm gear assy is at the wrong
> end of the food chain, being located right off the electric motor.   The very final gear is  one small gear driving the bigger gear
> that drives the output shaft. The design allows for too  much gear slop.  It’s a good rotor, BUT, dont get carried away with
> huge arrays, and I would also suggest tossing the oem m2 mast clamp...and use  the K7NV version for the  OR-2800,  his is
> the real deal.  K7LXC  also make a heavy duty version..but only for a 2 inch mast.  The K7NV version pinches the  mast,
> with barely any tq applied.   He makes it  for any diam mast u have, but it will only fit  one diam mast.   IE:  2 inch, 1.875 inch,
> 2.875 inch,  3.00  inch etc.     The oem m2  mast clamp is a fubar design.  Don’t mess with the  OR-2800  control box either,
> its ok, but no point and shoot knob, like on the Green heron.  Both boxes  have the usual ramp up / down,  PC control,  etc.
>
> ##  I swapped to a K7NV  small prop pitch + green heron box.... , no bigger or heavier than a OR-2800, but one helluva lot more TQ
> available, like 1200 ft lbs  vs  the 233  ft lbs of the OR-2800.    The GH box for the prop pitch, is  specific for the PP.
>
> Jim   VE7RF
>
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