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1. [TowerTalk] Stub mast loading and forces (score: 1): Author: Robert M0RCX <m6bfd@yahoo.com>; Date: Sat, 27 Apr 2013 17:35:01 +0100; Hello I am new to the forum and thank you for your acceptance into the group. There have been many discussions on wind loading to mast supported antennas but I was wondering if anyone has calculated; /archives//html/Towertalk/2013-04/msg00335.html (8,122 bytes)
2. Re: [TowerTalk] Stub mast loading and forces (score: 1): Author: "John Lemay" <john@carltonhouse.eclipse.co.uk>; Date: Sat, 27 Apr 2013 21:05:03 +0100; Robert The principal forces on your stub mast are bending and torque. If you place an aerial on a stub mast which is twice the length of your current one, the bending moment at the rotator will be tw; /archives//html/Towertalk/2013-04/msg00336.html (11,474 bytes)
3. Re: [TowerTalk] Stub mast loading and forces (score: 1): Author: MORCX <m6bfd@yahoo.com>; Date: Sat, 27 Apr 2013 21:35:34 +0100; Hello John, Thanks for your reply. I can confirm when the tower is luffed over it is at minimum height plus approx 6 foot and no more. This is what has caused us to call a halt to the work and conduc; /archives//html/Towertalk/2013-04/msg00337.html (13,492 bytes)
4. Re: [TowerTalk] Stub mast loading and forces (score: 1): Author: George Dubovsky <n4ua.va@gmail.com>; Date: Sat, 27 Apr 2013 16:52:54 -0400; You might also consider rotating one of the antennas 90 degrees for a coupling test "in place". If the interaction goes away, you might want to make the 90 degree offset permanent. Either keep track; /archives//html/Towertalk/2013-04/msg00338.html (14,658 bytes)
5. Re: [TowerTalk] Stub mast loading and forces (score: 1): Author: "David Aslin" <david@aslinvc.com>; Date: Sun, 28 Apr 2013 07:53:25 -0400; Robert, As you have identified, this is a risky situation that requires careful thought and planning. Some references to study: Physical Design of Yagi Antennas by Dave Leeson W6QHS (now W6NL). A wea; /archives//html/Towertalk/2013-04/msg00341.html (12,193 bytes)
6. Re: [TowerTalk] Stub mast loading and forces (score: 1): Author: <ve4xt@mymts.net>; Date: Sat, 27 Apr 2013 13:49:18 -0500; Hi It would make sense to confirm the A3 as the cause of interaction first, no? Thinking you could simply lower the A3s and then determine what effect it has on your VHF yagi. Also, how do you know t; /archives//html/Towertalk/2013-04/msg00342.html (10,768 bytes)

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