I tried this approach and had no luck with it. The antenna moved constantly
using 2 springs.
Mike W9RE
> -----Original Message-----
> From: towertalk-admin@contesting.com
> [mailto:towertalk-admin@contesting.com]On Behalf Of GALE STEWARD
> Sent: Wednesday, September 11, 2002 10:14 AM
> To: towertalk reflector
> Subject: Re: [Towertalk] Mast Coupler
>
>
> A bunch of years ago, there was an article in
> QST/CQ/HR (?) written by someone that had adapted an
> auto overload spring (the ones that get installed over
> the rear shock absorbers) as a mast "torque absorber".
> As I recall, the tower had two thrust bearings to keep
> the mast centered. The rotator was mounted several
> feet below the lower bearing. The lower end of the
> mast was slipped into one end of the spring and tack
> welded in several places. A short length of steel pipe
> was slipped into the lower end of the spring and also
> welded. The lower end of this short mast was clamped
> in the rotator. The spring in torsion absorbs some of
> the start/stop and wind gust forces. Have never seen
> anyone that actually used it but it looked like a
> pretty good idea. FYI...
>
> 73, Stew K3ND
>
>
> --- K7LXC@aol.com wrote:
> > In a message dated 9/10/02 10:23:48 PM Pacific
> > Daylight Time,
> > W4EF@dellroy.com writes:
> >
> > > Warren, KE6LEA and I put together the flex-disc
> > shock absorber
> > > scheme pictured below for the M^2 OR-2800 rotator
> > at W6UE:
> > >
> > > http://www.cco.caltech.edu/~w6ue/KT/OR-2800-1.jpg
> >
> > Very nice installation. Here's some historical
> > info:
> >
> > Plus: With the addition of a shock absorber like
> > this, the rotator capacity
> > can be increased by something like 20-30% since it
> > decreases the torque
> > forces on the rotator inner workings.
> >
> > Minus: Sometimes these torque forces tear the
> > coupler apart and then you've
> > got real problems. M2 introduced one for their Orion
> > some years ago but no
> > longer offer it because of problems. I don't think
> > W6NL uses them anymore.
> > YMMV.
> >
> > Cheers,
> > Steve K7LXC
> > TOWER TECH -
> > Professional tower services for commercial and
> > amateur
>
>
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