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Re: [TowerTalk] Rigid Steel Conduit as Mast?

Subject: Re: [TowerTalk] Rigid Steel Conduit as Mast?
Date: Fri, 5 Jun 2009 19:48:48 EDT
List-post: <">>
In a message dated 6/5/2009 5:18:01 P.M. Central Daylight Time, writes:

>  I asked a colleague who builds a lot of commercial two-way  
installations where I could find 2-inch hot-dipped galvanized mast  
material locally. He suggested that I use 1.5-inch rigid steel  
conduit. I'll be using a 10 ft length with a 3-element SteppIR (no  
30/40M element), with roughly 3 ft inside the top section of the  
tower. The tower is in a relatively protected location, so not a lot  
of wind speed. 

    So how much exposed mast will you have below the  antenna (top of tower 
to antenna spacing)?

>  I would question  whether this is sufficiently robust for a bigger 
antenna, but this is not  a lot of load. Any thoughts on this?  

        The proposed material is  really 1.9" OD, which is a little skewed 
from normal 2" OD ham equipment but  probably not enough to be fatal. The 
SteppIR mast clamps are a really tight fit  on 2" tubing so I imagine there 
will still be a sufficient fit for a reliable  albeit slightly smaller 
installation. A 3L SteppIR is a relatively small load so  given your proposed 
installation, it'll probably be fine. 
Steve     K7LXC
**************Mortgage rates drop to record lows. $200,000 for $1,029/mo 
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