Bill:
I plan on using a 10" mast, three with the rotator mounted about three feet
below the top of the tower, so 7 feet would stick out above the top of the
tower. The guy at the industrial metal supply told me that that pipe-wall
thickness would be 0.120", OD is 2". So I guess according to your
statement, that should be fine. Tom W6EIJ.
----- Original Message -----
From: "Bill Coleman" <aa4lr@arrl.net>
To: "Thomas Beltran" <tbeltran@earthlink.net>; <towertalk@contesting.com>
Sent: Thursday, January 10, 2002 1:02 PM
Subject: Re: [TowerTalk] Alum Masts
>
> On 1/10/02 1:03 PM, Thomas Beltran at tbeltran@earthlink.net wrote:
>
> >This discussion of Masts is quite timely for me. I was planning on using
> >schedule 80 Aluminum pipe for a TH-3MKIII and perhaps a rotatable dipole
for
> >17. Should I consider one of HRO's steel masts?
>
> Tom,
>
> What you left out is how high above the tower top you planned to have the
> antenna(s). That makes all the difference.
>
> In general, I'd avoid the use of "pipe" of any kind for a structural
> component, but if the antenna is right at the top of the tower, the
> bending moments are small enough that even "pipe" would work.
>
> I've got an A3S mounted 6 feet above the top of the tower on a 2" Al tube
> with a 3/32" wall. Plenty strong enough.
>
>
>
> Bill Coleman, AA4LR, PP-ASEL Mail: aa4lr@arrl.net
> Quote: "Not within a thousand years will man ever fly!"
> -- Wilbur Wright, 1901
>
>
>
> ________________________________________________________________________
> This list is sponsored by the new eHam.net Store. When you buy products
> like ICE filters, Array Solutions StackMatch, or M-Squared Antennas from
> the eHam Store for the same price you pay direct, a portion of the sale
> price goes to support this list. Check it out at http://www.eham.net.
>
> -----
> FAQ on WWW: http://www.contesting.com/FAQ/towertalk
> Submissions: towertalk@contesting.com
> Administrative requests: towertalk-REQUEST@contesting.com
> Problems: owner-towertalk@contesting.com
>
________________________________________________________________________
This list is sponsored by the new eHam.net Store. When you buy products
like ICE filters, Array Solutions StackMatch, or M-Squared Antennas from
the eHam Store for the same price you pay direct, a portion of the sale
price goes to support this list. Check it out at http://www.eham.net.
-----
FAQ on WWW: http://www.contesting.com/FAQ/towertalk
Submissions: towertalk@contesting.com
Administrative requests: towertalk-REQUEST@contesting.com
Problems: owner-towertalk@contesting.com
|