[TowerTalk] Straightening 45g tower base

[Blake Sobiloff]

That’s right, it’s the solid rod version. At the moment I’m only looking at putting up a VHF/UHF vertical (Diamond X300NA), but that could change someday so I’d like to get this as right as possible.

Thank you to everyone for your comments and suggestions! I decided to use some washers on the low leg to bring the tower closer to plumb, and then drill new mounting bolt holes 90° from the existing ones. Interestingly, it turns out the base wasn’t too far off, but the first segment appears to have a poorly manufactured leg—the tilt followed one leg as I tried the segment in all three orientations.

Now the tower is no more than 0.3° from plumb in any direction.

Let’s hope the rest of the segments don’t suffer from the same issue…

-- 
Blake Sobiloff (N6BNS)
Reno, NV (USA)


> On Jul 6, 2020, at 3:17 PM, W0MU Mike Fatchett <w0mu at w0mu.com> wrote:
> 
> That is with the load at the top of the tower.  If he mounts a rotor and has a 20 ft mast I think things could change pretty quickly?
> W0MU
> 
> On 7/4/2020 6:51 PM, jcjacobsen at q.com wrote:
>> How do,
>> 
>> Regarding wind load of 45G tower. If I read the original post correctly, the tower is a 45G SR ie: SOLID ROD. As such, and if this is true, the wind load, per Rohn specs, is: 110 mph 3 sec gust exp B 35 sq ft and exp C 22 sq ft. If it's std 45 G, won't take 110 gust. At 90 mph 3 sec gust, its rated at 4.9 sq ft. And I think someone should run the figures again on how much it would be off over 40 foot. If it's off 1" at the top of the short base, well my common sense says it off more than 4" at 40 foot. (But then I am old and senile)
>> 
>> 73
>> K9wn Jake
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