[TowerTalk] AS25G plate
uglyatc at msn.com
Wed Mar 15 16:21:44 EST 2006
Thanks for your email.
Instead of cutting a crossbar out of the tower and re-welding it,... I think
I am going to go with cutting the accessory shelf down. Hard to believe that
Rohn didn't design this shelf to slide down inside a regular section of
tower,... only at the very top or between 10ft sections.
Thanks and 73
>From: "RICHARD BOYD" <ke3q at msn.com>
>To: "Bruce Ferratt" <uglyatc at msn.com>
>Subject: Re: [TowerTalk] AS25G plate
>Date: Wed, 15 Mar 2006 09:23:34 -0500
>You're right that the gravity load of that heavy piece of aluminum will be
>Otherwise, I'd say the downward load shouldn't be that much of a problem.
>Many people, including professionals, prefer the tubular Rohn 25 top
>section to the thrust bearing approach. And you really need two thrust
>bearings, one mounted on a second accessory plate, to keep the mast
>straight when the rotators is taken in or out.
>But as to your question, yes, you can cut the Rohn plate. Use a hacksaw
>blade on the saw of your choice. As to loss of strength, any time you
>remove material you are, at a minimum, "changing" things and, probably,
>weakening it. The question, though, is whether sufficient strength
>(material) remains. And, your rotator, to some extent, once it's bolted in
>place on the plate, is making up for some of the lost material. The
>rotator itself is metal too and becomes part of the mechanical structure
>and picks up some loads.
>Frankly, except for an extraordinarily heavy mast, and if you put a large
>load of antennas on the mast, the plate and rotator should be fine.
>If you want to go to the tubular Rohn top section, I have one to sell for
>$50. It would tend to make things easier I think. And I have a couple
>straight sections of 25 to sell too if you're interested. Or upgrade the
>whole thing to Rohn 45, 55, or 65, all of which I have to sell!
>73 - Rich, KE3Q
> ----- Original Message -----
> From: Bruce Ferratt<mailto:uglyatc at msn.com>
> To: towertalk at contesting.com<mailto:towertalk at contesting.com>
> Sent: Tuesday, March 14, 2006 10:59 PM
> Subject: [TowerTalk] AS25G plate
> Can the Rohn AS25G accessory plate be cut easily and with what type of
> Without sacrificing strength can a Yaesu rotor GS-450 be mounted on a
>cut plate? I will be using a thrust bearing (TB3) for the vertical load.
>Does the AS25G accommodate the Yaesu rotors without having to re-drill
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