[TowerTalk] masts.

[jeremy-ca]

Calculated risk is what I called it!

If only a single antenna of any significant wind load is going to be mounted 
just above the tower top plate then cast iron pipe is more than sufficient 
as there is very little bending moment.

The main headache with cast pipe is getting it shimmed properly in the Ham M 
style of rotator. That was one reason I got suckered into the Daiwa & Create 
since they have floating mounts. Finally went with the original Orion 2300 
which is still in use today after some upgrades.

Carl
KM1H


----- Original Message ----- 
From: <K7LXC at aol.com>
To: <km1h at jeremy.mv.com>; <towertalk at contesting.com>; <Eroddy4366 at aol.com>
Sent: Friday, June 01, 2007 12:36 PM
Subject: Re: [TowerTalk] masts.


>
> In a message dated 6/1/2007 9:13:46 A.M. Pacific Daylight Time,
> km1h at jeremy.mv.com writes:
>
>>  At a former QTH with less wind exposure I had a 20/15/10  stack of W2PV
> 4el
> monobanders on 20' of 2 3/8 OD galvanized cast pipe.  Except for eating
> rotators (Daiwa and Create even using 2 thrust bearings)  it survived just
> fine thru many northeasters, CAT 2 & 3 hurricanes and  ice storms while on
> 100' of 25G.
> Im sure that there are many parts of  the country that cast pipe would 
> fail
> but dont discount it  altogether.
>
>
>
> In other words, you lucked  out!
>
> Cheers,
> Steve    K7LXC
> TOWER TECH
>
>
>
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