[TowerTalk] Or2800DC smoking control box

David Jordan wa3gin at comcast.net
Fri Jun 1 07:14:23 PDT 2012

Nat sent me a picture of the inside of the controller.  It appears one of 
the DC voltage components near the rear panel is fried, maybe a regulator. 
Black soot on the board and melted plastic sprayed on the inside of the rear 
panel.  The question in my mind is what externally could be faulted such 
that this device would self-distruct with such violence. Having just come 
for the M2 factory one would conclude the fault was external to the 

----- Original Message ----- 
From: "Zivney, Terry" <00tlzivney at bsu.edu>
To: <towertalk at contesting.com>
Sent: Friday, June 01, 2012 9:36 AM
Subject: Re: [TowerTalk] Or2800DC smoking control box

> Les, W2LK said:
> The OR2800DC runs on 30-47VDC. Polarity determines rotation direction
> and voltage determines speed.
> If the control box is smoking, there is probably a stray wire strand
> shorted in the control cable somewhere.
> I would think that the likelihood of a short in the rotator itself is low.
> Pins 1 & 2 on the rear of the controller are the turning voltage.
> Pins 5 & 6 are around 10V, low current, used for the pulse counter and
> shouldn't be a problem.
> Recheck the controller cable connections for stray strands or cracks/cuts.
> Les W2LK
> **************
> A DC motor should turn (slowly) on well under the rated operating
> voltage.
> A short in the 'control wire' will not cause smoking.  The reed switch
> in the rotor SHORTS terminals 5 & 6 in normal operation; shorting
> and opening those terminals is how the control box determines
> the location of the antenna (counting pulses).
> Terry N4TZ
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