[SCCC] Tower Mast Question

[Dave Hachadorian]

----- Original Message ----- 
From: "Juan" <w6now at hushmail.com>
To: <sccc at contesting.com>
Sent: Sunday, January 28, 2007 9:57 AM
Subject: [SCCC] Tower Mast Question


> Hello contesters, I'm looking for advice on the size/type 
> of mast
> that I should be looking for. Some decissions have not 
> been made
> yet about the antennas that would go up at my new place.
>
> My Tower option would include either 55' or 72' (not sure 
> yet)
> (Rated at: 50 MPH Winds -- 37 sq feet; 300 lbs) 55'
> (Rated at: 50 MPH Winds -- 35 sq feet; 350 lbs) 72'
>
> I've seen some folks go after a chromoly mast, and others 
> after a
> stainless stell and others using a reinforced mast. 
> Ideally I would
> like a 25' mast (4' for rotator inside tower, and 21' for 
> antenna
> installation)
>
> thanks in advance.

Here's a good mast calculator:
http://www.math.niu.edu/KARC/mast/

I think steel tubing comes in mostly 21' lengths. I think 
about 30% should be below the thrust bearing. Make sure 
there are provisions for swapping out defective rotators. 
You can use a second rotator plate just above the rotator, 
to secure the mast while the rotator is swapped out.

Dave Hachadorian, K6LL
Yuma, AZ










































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