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Re: [TowerTalk] Biggest rotor that will fit in a Rohn 25G

To: towertalk@contesting.com
Subject: Re: [TowerTalk] Biggest rotor that will fit in a Rohn 25G
From: "john@kk9a.com" <john@kk9a.com>
Date: Thu, 21 Jul 2016 11:50:32 -0400
List-post: <towertalk@contesting.com">mailto:towertalk@contesting.com>
Does N9JF use a 6 guy cable torque stabilizer or just three torque arms
attached to the tower. The latter does little to prevent twisting.  A
Green Heron controller sounds like it would be a nice addition to the
AlfaSpid.

John KK9A

To:     <towertalk@contesting.com>
Subject:        Re: [TowerTalk] Biggest rotor that will fit in a Rohn 25G
From:   "Danny Pease" <dpease@adams.net>
Date:   Thu, 21 Jul 2016 08:09:42 -0500

Jeff, yes, a small AlfaSpid will barely fit inside of Rohn 25G tower, we put
one in a 112 foot Rohn 25G tower at N9JF's, about 8 feet down from the top.
It was not easy and we did have to slightly bend one of the diagonals to get
it centered. It is turning a 2 element 40 and a 5 element 10 meter beam with
ease. The biggest drawback I saw was the rotor control box does not allow
the rotor to ramp up or ramp down and when it starts turning, it does put a
good bit of twist to the tower, even with anti-torque arms. Same applies to
stopping, when it stops, there is no slowing down, it simply stops turning.
A different rotor controller would be needed to allow a softer start and
stop.

Danny NG9R

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