|To:||"Tower (K8RI)" <email@example.com>|
|Subject:||Re: [TowerTalk] Speaking of wood supports|
|From:||Don Havlicek <firstname.lastname@example.org>|
|Date:||Wed, 13 Oct 2004 17:47:00 -0500|
When I was in college [before electricity, it seems], I built a
fold-over tower of 2 12-foot long 4x4's and 2 18-foot long 2x12's.|
The first 4x4 was put in a hole approximately 4' deep and the two 2x12's were lag-bolted to that piece.
I drilled a 1-inch diameter hole in the two 2x12's approximately 6 inches from the other end of them, and inserted a 1-inch bolt through them and the mid-point of the other 4x4.
Using the second 4x4 as a 'push-arm' and a stout rope, I rotated the assembly upward and placed a second 1-inch bolt through the 2x12's and the 'ground' 4x4 to hold the entire assembly erect.
Having previously mounted a rotor-bracket and thrust bearing on the upper 4x4, I was then able to allow it to turn downward, using the weight of those brackets, inserted a mast through the bearing and into the rotor ... climbed a short ladder and tightened the mast in the rotor ... then, mounted the 5-element 15m yagi I had assembled [upside down!] to the mast.
Pulling on the stout rope [still attached to the far end of the upper 4x4, I was able to rotate the entire structure to operating position.
Yes .. I had previously mounted a piece of 2x8 to the [now] lower end of the upper 4x4 to prevent it from 'over-rotating'.
This 'tower' put the 15m yagi approximately 23 feet above ground, and provided me with a lot of DX for a few years .. until the entire thing came crashing down when 80+ mph winds hit one Spring day ...
Makes me smile to think of what we were able to manufacture when we couldn't afford to buy something more permanent!
Tower (K8RI) wrote:
The note on using a wood Gin pole jogged a very old memory.
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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