[TowerTalk] Basic tower installation question

[Roger (K8RI)]

James Wolf wrote:
> Tom,
>
> I'd go with the pier pin or a rooftop base on a flat cement slab.  Use long
> bolts in the cement to bolt the rooftop base to.  
> I see no value in sinking tower sections in cement.
>   
For years the concrete base was standard on smaller towers which tend to 
be more flexible. ROHN still recommends that approach for bracketed 
towers, but the pier pin base for taller, guyed towers. Using the pier 
pin removes most of the torsional forces at the base, which with larger 
antenna systems can be considerable.  With the smaller systems it 
probably doesn't make a nickels bit of difference. 

I'd stick with the manufacturers recommendations and use the pier pin 
base  as long as the tower is not bracketed to a building.  OTOH I find 
when working by myself that the concrete base installation is easier. 
Still if using a large antenna or the possibility of installing a large 
antenna exists I'd certainly go with the pier pin.

73 

Roger (K8RI)
> Jim, KR9U
>
>
>
>   
>> My basic question is about the base. Should the base for this system be a
>> pier-pin type base or just a Rohn concrete base section? At this point I
>> could do either, but would like to install the best base for this system.
>> The other question would be would it really make any significant difference
>> which type base to use for this application, considering the load I will
>> have at the top of the tower?
>>     
>
>
>   
>> Tom - W4BQF
>>     
>
>
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