[TowerTalk] Planning New Tower

[Mark Robinson]

Thanks - good points - what tower would be suitable for a beam of this size 
or should I just go with the 4 ele steppir and do something else for 40m 
such as a sloping dipole array or a 4 square

We can get some pretty severe microbursts here

Mark N1UK G3ZZM


----- Original Message ----- 
From: "K4SAV" <RadioIR at charter.net>
To: <towertalk at contesting.com>
Sent: Sunday, 16 March, 2008 7:44 PM
Subject: Re: [TowerTalk] Planning New Tower


>I think you are a bit overloaded with that tower.  The tower is rated
> for 16 sq ft at 70 mph and the MonstIR has a load of 23.9 sq ft.   I'm
> not sure how the rating goes up as you lower the tower, but I would
> expect a significant increase.  I have tried to get that information,
> but US Tower doesn't rate them like that and won't give out any info.
>
> Another item of concern, and this is the reason I chickened out putting
> a MonstIR on a crankup which was rated to handle the windload.  Because
> of the size, those antennas can put a lot of torque on a tower.  If you
> look at the HDX series of crankups the only thing resisting that torque
> is 3 little ears.  If those bend, the tower is jammed. I was unable to
> get any torque rating information out of US Tower.
>
> Jerry, K4SAV
>
> Mark Robinson wrote:
>
>>I am starting the planning phase of my tower. I am thinking of installing 
>>a Texas Towers HDX-589MDPL crank up tower. I would like to put a MonstIR 
>>beam on it. I am concerned with the windloading - fully extended I don't 
>>think that I have enough safety margin - I believe that the Steppir has a 
>>windload of around 30sq feet.
>>
>>Can I guy this tower at the top to get a better wind loading or should I 
>>leave it at say 50 of 60 feet most of the time? Does anyone know how the 
>>max windloading figure increases as the tower is nested?
>>
>>What would be the recommended rotor for a beam of this mass - I want the 
>>installation to hold up in our rough summer storms. I am located in North 
>>Carolina
>>
>>
>>thanks  Mark N1UK G3ZZM
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>
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