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Re: [TowerTalk] Mast slipping

To: "'Byron Lichtenwalner'" <w3wkr@verizon.net>,<towertalk@contesting.com>
Subject: Re: [TowerTalk] Mast slipping
From: "Gary Saboe" <viking@world-net.net>
Date: Fri, 20 Apr 2007 21:28:46 -0500
List-post: <mailto:towertalk@contesting.com>
The Slipp-Nott has been very effective for both slippage problems with the
Orion M2 2800 mast clamp, as well as mast-to-boom slippage on the MonstIR.

http://www.tennadyne.com/slipp_nott.htm

Gary, NØGS

-----Original Message-----
From: towertalk-bounces@contesting.com
[mailto:towertalk-bounces@contesting.com] On Behalf Of Byron Lichtenwalner
Sent: Friday, April 20, 2007 8:27 PM
To: towertalk@contesting.com
Subject: [TowerTalk] Mast slipping

I am in the process of replacing my current rotor with a 2800.  I have a
Steppir MonstIR on a 2" mast.  
In the attached note Steve suggests pinning the 2800 mast clamps for
everything EXCEPT the antenna I have.
 
What would you suggest for the MonstIR ?
 
Byron, W3WKR
 
In a message dated 4/17/2007 7:24:54 P.M. Pacific Daylight Time,
cmsande@gmail.com writes:
 
>  I saw some old posts by you (circa 2002) stating that you have  
> started
pinning the Orion rotators due to slippage.  I have a Orion  RC2800PX
turning a 4L SteppIR and each time we have some wind, by antenna gets  swung
out of position.  This happened again today. 
 
Hiya, Craig --
 
    It's an Orion design flaw, the mast clamp has 2  problems. First, the
surface where the nuts and bolts seat are dimpled - not  flat. Over time,
the wind motion causes the washers to pound the dimples flat,  thus
loosening up

the
nuts; then the mast is loose and starts moving. The  problem can be
eliminated by milling or grinding those surfaces flat. 
 
    Secondly only 2-3 teeth of the clamp actually  contact the mast,
resulting in very little clamping. Then you get the teeth  being worn down
as the mast moves back and forth and it loosens some more.  
 
You can re-tighten everything and it'll probably  be good for a couple of
years. For a 4L SteppIR, you can also pin the mast.  Pinning works for
everything except a MonstIR. 
 
 
>  I have heard good things about the Green Heron Engineering  univeral
rotator controller, which can be re-calibrated in case the mast slips  in
the rotator, however eventually the coaxial cable loop would start wrapping
around the mast if I did nothing more to secure the rotator-to-mast
connection. 
 
    The GH controller is very nice but won't do  anything about the basic
problem. 
 
 
    What I do for my customers is provide a new  replacement mast clamp that

uses 6 U-bolts to hold the mast and does NOT slip.  It's $120.00 but if you
re-tighten everything and pin the mast, you'll be good  to go. 
 
Cheers,
Steve      K7LXC
Champion Radio Products
Cell: 206-890-4188
 
 

 

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