[TowerTalk] Recommended T-Bearing for a 25G

[FireBrick]

George
Good points.
I have a slightly quicker and easier way of stabilizing the antenna while
removing the rotator.
I have an old boom to mast mounting plate on the mast, above the bearing but
still inside the tower.
I insert a rod through the mast clamps and clamp the rod to the tower tubes.
I don't have to climb up higher than the rotor.
When I replace the rotor, I remove that rod leaving that old boom to mast
bracket in place.

I don't even tighten the clamps except for one.

----- Original Message ----- 
From: "George Skoubis" <george.skoubis at verizon.net>
To: <towertalk at contesting.com>
Sent: Wednesday, April 09, 2003 7:30 PM
Subject: RE: [TowerTalk] Recommended T-Bearing for a 25G


> If he lowers the rotor plate and mounts an accessory plate with a thrust
> bearing he can swap out the rotor easily in case of rotor trouble.
>
> All you have to do is secure the antennas so they don't turn in the
> wind. I used a couple of slings over the boom, on opposite sides of the
> mast, then tied them off to a couple of guy anchors on the ground to
> keep the antennas from freewheeling.
>
> Then I could unhook the rotor, fix it at my leisure, climb back up the
> tower and replace it without taking down the mast or antennas.
>
> The extra plate and bearing were cheaper than buying a spare rotor.
>
> Of course I wound up with a spare rotor soon enough anyways but it did
> make switching rotors easy (and I never had to switch it out after I
> bought the spare one!).
>
> I had two thrust bearings and made sure they were aligned vertically, I
> would guess that a non-vertical mast would put a lot of sideload on a
> rotor otherwise...
>
> Just an idea I used... I don't know if there is some reason not to do
> this, but I'm sure someone will let us know if this is a bad idea....
>
> 73,
>
> George / KF9YR
>
> -----Original Message-----
> From: towertalk-bounces at contesting.com
> [mailto:towertalk-bounces at contesting.com] On Behalf Of Pete Smith
> Sent: Wednesday, April 09, 2003 3:55 PM
> To: Dino Darling; towertalk at contesting.com
> Subject: Re: [TowerTalk] Recommended T-Bearing for a 25G
>
> At 10:57 AM 4/9/03 -0700, Dino Darling wrote:
> >My friend will need a bearing for the top of his 25G.  The top section
> >comes to a point so my thinking was to lower the rotor plate and
> install
> >an accessory plate with the bearing mounted to it.  Or, is there a
> bearing
> >that goes over the top tube?
> >
>
> I think this is overkill, particularly if he is using a galvanized or
> chrome-moly steel mast.  Mine has been up since 1995 without a bearing,
> and
> shows no signs of any problems -- the fit through the pointy-top is
> loose
> enough so that at <1 RPM and with similar hardness materials it will
> probably outlast me.
>
> 73, Pete N4ZR
> The World HF Contest Station Database was updated 2 April 03.
> Are you current? www.pvrc.org/wcsd/wcsdsearch.htm
>
>
>
> _______________________________________________
>
> 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 at 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 at contesting.com
> http://lists.contesting.com/mailman/listinfo/towertalk
>
>