[TowerTalk] Crankup Tower for DB-36

[John Kuklewicz N7ZN]

Jim,

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 It wasn't noticable when the tower was retracted but boy did it make its presence known when it was up and it was windy.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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