I don't know if they are but I have one that I never have used.
Julio, W4HY
----- Original Message -----
From: "Mark - AA6DX" <aa6dx@pacbell.net>
To: <towertalk@contesting.com>
Sent: Wednesday, February 02, 2005 7:04 PM
Subject: Re: [TowerTalk] Glen Martain
> Are the infamous impregnated wood thrust bearings still being offered for
> sale?
> They worked swell for small tribanders, etc ...... Mark AA6DX
> ----- Original Message -----
> From: "Rex Lint" <rex@lint.mv.com>
> To: <towertalk@contesting.com>
> Sent: Wednesday, February 02, 2005 1:42 PM
> Subject: RE: [TowerTalk] Glen Martain
>
>
> >
> > As long as you have a short mast (less than 10 feet) and only one beam
> > (mounted close to the "tower", you can get by just using the sleeve as a
> > bushing, and not use a bearing at all. Mount the rotator as low as you
> > can,
> > so the mast has as much below the tower as above it...
> >
> > I've got a BIG tribander (KT34-XA and a 2 el 40M beam with a 20 foot
> > hurricane fence pipe mast that's been up for 7 years without a thrust
> > bearing and haven't had a problem (except with the driven element, but
> > that's orthogonal to the discussion.)
> >
> > Rex
> > K1HI
> >
> >>I just bought me a roof top tower from Glen Martain. They are out of
> >>thrust
> >>bearings and wont have any for about 6-9 months can I use any thrust
> >>bearing? Iam going to use a Yaseu rotor for a 4 element crush craft
or
> >>a
> >>3 element STEPPIR..
> >
> > Yaesu makes a nice, but light duty thrust bearing. I'd assume it'd be
> > adequate for what you describe.
> >
> >>
> >> DO I use one to match the rotor or the tower? Iam confused
> >> Dave
> >
> > The rotor mounts down in the tower and the thrust bearing at the top.
It
> > takes the side thrust and eliminates the leverage (tipping moment) at
the
> > rotor. In some cases it helps to support the load, which you shouldn't
be
> > a
> > problem with a simple installation. Some towers come with a pipe, or
> > sleeve
> > at the top of the top section. This serves as a good, simple, and
> > effective
> > thrust bearing for most ham type installations.
> >
> > Roger Halstead (K8RI & ARRL Life Member)
>
>
> _______________________________________________
>
> 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.
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