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Re: [TowerTalk] rotor comparisions

To: tower@rogerhalstead.com
Subject: Re: [TowerTalk] rotor comparisions
From: k2qmf@juno.com
Date: Fri, 26 Mar 2004 11:01:23 -0500
List-post: <mailto:towertalk@contesting.com>
The M2 OR-2800 is a great rotator.
Just Check the specs.  Also, service from
M2 is outstanding...

73,  Ted  K2QMF

P.S. - Make sure you get the new version with the
          green readouts..   Has all the updates.


On Thu, 25 Mar 2004 22:09:55 -0500 "Tower (K8RI)"
<tower@rogerhalstead.com> writes:
> 
> Oops... You also asked why.
> 
> The PST-61 is rugged, requires no brake and has no play.
> 
> The HDR 300 requires a brake, the brake switching is really odd ball 
> in that
> you have to manually turn off the brake and then turn the antenna. 
> The
> output shaft turns relatively easy with the brake off.  Turning the 
> brake
> off in high winds means the antennas are going to weather vane 
> "right now".
> Then at the least you have to dismantle the rotor and get it back 
> between
> the limit switches.
> 
> 
> > Which is better and why?M2 2800 or whatever they call it 
> now,Prosisteil
> > PST-61 or Hy-Gain HDR-300.Looking for a stout rotor to turn some 
> big
> stacks
> > of uhf beams in a high wind area.I have a PST-51 up there now but 
> I keep
> > shearing off the "pin" bolt and I don't want to put a bigger one 
> in and
> then
> > break the rotor.Plus I think the bolts that hold the rotor plate 
> to the
> > rotor are getting stretched which means it can turn 20 dergrees or 
> so back
> 
> Fix the bolts and you won't be shearing off the other bolt.  Those 
> rotor
> plate bolts have to be solid.  Mine is keyed and bolted to the shaft 
> with 4
> bolts in the plate.  Any play in the system puts a tremendous load 
> on not
> only the rotor, but the whole tower when it comes up against the 
> stop.
> 
> I have on the order of 300# worth of masting plus a TH-5 at 100 
> feet, 7L C3i
> at 115 feet, and 2 11-L  440s  and 2 12-L 144s on a 14 foot cross 
> boom at
> 130 feet.  70 MPH plus winds a couple weeks back caused the mast to 
> slip
> about 10 degrees in the mount, but nothing broke. I just have to go 
> back up
> and realign things.
> 
> 
> > and forth and then that puts a lot of torque on the "pin" bolt and 
> then
> ping
> > it breaks.The "pin" bolt is grade 5 3/8*4 with a grade 5 cap 
> screw.It does
> > indeed break as to just getting lose and then fall off.  Gregg  
> K9KL
> 
> It only takes a few degrees of play to shear bolts in winds far less 
> than
> the system design.
> I had mine shear off some 5/16 ths stainless pins in the mast.  
> Reamed the
> holes and put in 3/8ths (tight fit).  I think I got those sizes 
> right.  I
> haven't been up there since late last Summer.
> >
> 
> Roger Halstead (K8RI, EN73 & ARRL Life Member)
> N833R, World's Oldest Debonair (S# CD-2)
> www.rogerhalstead.com
> >
> > _______________________________________________
> >
> > See: http://www.mscomputer.com  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.
> >
> > _______________________________________________
> > TowerTalk mailing list
> > TowerTalk@contesting.com
> > http://lists.contesting.com/mailman/listinfo/towertalk
> >
> 
> 
> _______________________________________________
> 
> See: http://www.mscomputer.com  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.
> 
> _______________________________________________
> TowerTalk mailing list
> TowerTalk@contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
> 
> 

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_______________________________________________

See: http://www.mscomputer.com  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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