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Re: [TowerTalk] Speaking of wood supports

To: <>, "Tower (K8RI)" <>
Subject: Re: [TowerTalk] Speaking of wood supports
Date: Wed, 13 Oct 2004 21:44:30 -0400
List-post: <>
And, you remember the first Yagis that had old wooden ladders as the boom!
For most of us, myself included, we've only seen photos of them on QST 
covers and such, although I did acquire "most of" the remains of the 
elements from one (which also had wooden parts) a couple years ago when the 
family was selling the home of a silent key ham and cleaning out the garage. 
Pretty cool, a bit of ham radio history.  Hmmm, I've got a bit of wall here 
I could hang the elements on as "ham radio art."

It'll will join the "W6AM transformer," "W3GRF antenna switch," "W3ZKH 
(W3ZZ) WWV receiver," and "W3AU-address box lid."  hi.  I'm sure I'm leaving 
some other noteworthy artifacts out!

73 - Rich, KE3Q

----- Original Message ----- 
From: "Don Havlicek" <>
To: "Tower (K8RI)" <>
Cc: <>
Sent: Wednesday, October 13, 2004 6:47 PM
Subject: Re: [TowerTalk] Speaking of wood supports

> 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!
> Don
> N8DE
> Tower (K8RI) wrote:
> > The note on  using a wood Gin pole jogged a very old memory.
> >
> > Wayyyy back when I was first licensed, I built a simple A-frame out of 2
> > X 4s (when they were really 2X4s). It was multiple layers for
> > reinforcement and was about 30 feet tall (as I recollect)
> >
> > It hadn't been up all that long. Maybe a few weeks when we had a pretty
> > strong wind. Out there in the flat lands there isn't much to slow it up.
> >
> > I was operating on 75 when I noted a low frequency hum.  I couldn't find
> > what was making the noise, but it was one that seemed to penetrate right
> > through me.
> > I happened to look out the window and saw the A-frame vibrating like a
> > tuning fork. It was moving so fast you could see the standing waves.  I
> > was looking right at it when it let go.  It sounded like a 12 gage
> > shotgun.  The largest piece I found was less than 3 feet long.  As I
> > recall, some of those pieces flew over 50 feet.
> >
> > I don't think I'd want to use wood for a Gin pole except for very light
> > duty.<:-))
> >
> _______________________________________________
> See:  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

See:  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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