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Re: [TowerTalk] OR-2800 motor.. DC vs AC ?

To: "'Tower and HF antenna construction topics.'" <>
Subject: Re: [TowerTalk] OR-2800 motor.. DC vs AC ?
From: "Dick Hanson" <>
Reply-to: "Tower and HF antenna construction topics." <>
Date: Wed, 3 Mar 2010 06:55:54 -0600
List-post: <">>
Hi Jim....
I am presently using 4 of the DC versions for my rotating towers.
Instead of the M2 controllers tho, I am using the Green Herons.

Jeff at Green Heron convinced me that the DC motor is the overwhelming
choice for rotor control.
I did not get into the 'why' part, but figured since he was a major
contester and designer of things electrical and mechanical that his advice
might bode well for me.

Since my rotators are at the bottom of my towers and because I am using PVC
weatherproof boxes for joining the rotor pigtails to my shack control cable,
the length of the pigtails are/were entirely satisfactory.

Dick, K5AND

-----Original Message-----
[] On Behalf Of Jim Thomson
Sent: Wednesday, March 03, 2010 6:48 AM
Subject: [TowerTalk] OR-2800 motor.. DC vs AC ?

I have 2 of these  OR-2800  rotor's.  The original one has the AC motor, and
has never been used. 
The 2nd one I bought used, and am 99%  sure it has the DC motor in it. 

I Dunno if the 2 x mating controller's  are  interchangeable or not ?    I
like the pulse width modulated 
motor control feature.. you can slow it right down to a crawl.   If the 2 x
controller's  are not interchangeable,
I'm sure the green heron controller  will handle either the DC or AC motor ?

The idea here was I only require one rotor on the new tower, and the  2nd
OR-2800  was to be a spare.

Has anybody compared the torque of the AC  vs  DC  version ??     Is it
worth having M2  retrofitting 
the DC  motor into my older AC version ?   One thing I don't like is the
very short 'pigtails'  coming out 
of the rotor itself.   They should have made em longer.. like 10' at least.
Then splice them at a junction
box, [ which I see they now have].  The original twist locking splice was a
dead loss. 

The new water proof junction box  would make for any trbl shooting, a lot

Any thoughts would be appreciated. 

later.. Jim   VE7RF

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