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Re: [TowerTalk] Crankup Tower for DB-36

To: Jim Hoge <>
Subject: Re: [TowerTalk] Crankup Tower for DB-36
From: John Kuklewicz N7ZN <>
Date: Sun, 29 Jan 2012 08:48:29 -0800
List-post: <">>

I thank  you for sharing your observations.

I guess I will just have to learn to live with the noise. No way am I 
going to get involved with a tower I have to climb. (And I live in a 
rural area where renting a tall (70 foot) man lift is rather problematic.

At this point the wind loading seems to be the biggest problem, but I 
will be sure to also account for the weight loading as well. Thank you 
for pointing that out..

As to the different windspeeds. I wish I had a specification source that 
was totally consistent. However, I would not think that the difference 
in specification between 90mph and 85mph would be all that great. I 
realize that the relationship is non-linear, but the 6% windpseed 
difference certainly cannot lead to a 3.3x spec difference. I am more 
concerned that the Tashjian tower spec does no indicate which exposure 
regime is being used.

Thank you and 73;

John N7ZN

On 1/27/2012 2:15 PM, Jim Hoge wrote:
> John,
> My experience was with a Triex LM-470 and a Tennadyne T-12 lpda antenna. 
> While it's not the same weight or exposure it did enlighten me to one 
> drawback of a crankup. Tower sections clanked as the wind spun the antenna 
> and the tower sections back and forth. It wasn't noticable when the tower was 
> retracted but boy did it make its presence known when it was up and it was 
> windy. It didn't take a lot of wind, certainly not to the point I would have 
> considered lowering the tower for safety.
> Be aware too of the topload weight capacity of the towers. Do not forget to 
> add in the weight of the rotor, control cable, mast, antenna, tilt plate, 
> coax, and standoffs.
> Finally, notice that the specs you listed are for differing windspeeds. It's 
> like comparing apples to oranges. Use the same specs or have an analysis run 
> to make comparisons.
> gl es 73,
> Jim W5QM
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