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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