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re[4]: [TowerTalk] M2 OR-2800 Rotor Stuck

To: w9ge <>
Subject: re[4]: [TowerTalk] M2 OR-2800 Rotor Stuck
From: Jim Idelson <>
Date: Fri, 5 Nov 2004 09:07:00 -0500
List-post: <>
Well, my half-hearted assault on the tower seems to have been enough to do the 
trick. Came back inside to try a few more things and it just started working. 
Give me a break.

Thanks to you and everyone else who's been helping out.

Got the antennas turned in a good direction now. Just have to hope the winds 
don't do damage anyway . . .



> Unlikely the bolt dropping down is the have a classic "no 
pulse" situation.

remove leads from pins 5-6.  Try to move rotator by pushing either dwn or up 
button while watching for voltage on pins 5-6 (Use mode 0 and speed 9).  You 
should see 11.3vdc for less than one second.  If not, then turn box off and 
measure resistance between pins 5 and 6.  If less than 5000 ohm, then the 
MOV may be bad.  Cut it loose and try again. If no voltage then the 
controller box is "bad".  If voltage present then suspect leads 5-6 going to 
the rotator, or the magnets in the rotator are "bad" (very unlikely).  You 
can read the resistance change on pins 5/6, but it is not easy to see.  Hook 
everything back up and try to move the beam.  You should see "pulses" on 
leads 5-6.  Just measuring the resistance of the pulse leads is no 
indication, depending on state there may be an open or short.  You can watch 
the pulse leads with an ohm-meter while turning the beam with the aux 12vdc 
supply to check for continuity.

The rotator unit is quite bullet proof.  It is doubtful you can do any harm 
to it with a 12vdc supply. I stalled one of mine once, and ripped an element 
off the beam before I realized why it was not turning.  Burned up the 
rotator controller, but did no harm at all to the rotator itself.  Come to 
find out I had the wrong fuze size in the controller...yes it was too large! 
My fault entirely.  Good luck! If you decide to call M2 for help, ask for 
Wyatt.  He is the 2800 expert.  73 bob de w9ge 


Jim Idelson K1IR
email    k1ir at


See:  for "Self Supporting Towers", "Wireless Weather 
Stations", and lot's more.  Call Toll Free, 1-800-333-9041 with any questions 
and ask for Sherman, W2FLA.

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