[TowerTalk] Short (5') mast OK?

[Dave Hachadorian]

Texas Towers will saw off one foot from their 10' masts for 
you. The 9 footer is UPS-shippable.

Dave Hachadorian, K6LL
Yuma, AZ

----- Original Message ----- 
From: "jknodel M Knodel" <jknodel at msn.com>
To: <towertalk at contesting.com>
Sent: Wednesday, February 21, 2007 5:50 PM
Subject: [TowerTalk] Short (5') mast OK?


> Greetings TT,
>
> I am planning (finally) my R25 installation this spring. 
> I am currently
> shopping around for masts and found that I have a few 
> options.  The first is
> to get a 10' mast from Home Depot.  This is the same mast 
> that is used for
> new overhead electrical services.  I would like to go with 
> a ten footer but
> dont have any information on the material used for these 
> masts.  My other
> option is to order a high-carbon steel mast.  Again, I 
> would like to go with
> a ten footer but the shipping price is ridiculous.  It 
> would cost $400 plus
> just to ship the darn thing.  I can get a high-carbon 
> steel 5' mast that
> will ship by UPS.  Shipping by UPS is only a few dollars 
> for a 5' mast.
>
> So, my question is this:  Is a 5' mast adequate for my 
> installation of a 3
> element SteppIR with passive 6m element at 60'?  This will 
> be the only
> antenna I have installed on the mast.  I have read that a 
> longer mast (10'
> or more) will reduce the torque and twisting moment on the 
> rotor.  Is there
> really much of a difference between 5' or 10' in this 
> regard?  By the way, I
> will be using a BPL25G top plate on the tower with a 
> thrust bearing to
> reduce the load on the rotor.
>
> Thanks for any help you can give.  I appreciate it.
>
> Jon, N7XW
>
>
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