My tower is overloaded and I know it. That's why I run it down during the
monsoon wind season as I have observed an 85mph microburst at this QTH. And
my existing antenna array on the tower survived that (my 80m 4sq didn't)
de Paul, W8AEF
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ZF2TA FO8DX FO0PLA 8Q7AA XZ0A
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----- Original Message -----
From: "Alan Beagley" <ab2os@optonline.net>
To: "Paul Playford" <w8aef@worldnet.att.net>
Sent: Saturday, October 25, 2003 2:18 PM
Subject: Re: [TowerTalk] Re: First Tower questions
> On 10/25/03 07:59 pm Paul Playford put fingers to keyboard and launched
> the following message into cyberspace:
>
> > I believe pipe is measured by ID. Stay away from pipe. I use a 2"o.d.
x
> > 20' mast in my LM470. My T2X rotator is perhaps 4 feet from the top of
the
> > tower with a thrust bearing on top of the tower that supports the mast
and
> > monoband 4 element yagis for 10, 15 & 20. I aligned the thrust bearing
by
> > rotating the mast (clamps loose on rotator) and adjusting the thrust
bearing
> > so there is no mast to tower binding. I suggest you use the longest
mast
> > you can obtain because you will always wish you had.
>
> But you have to take the length of the mast into account when
> calculating the wind loading (can't remember where I read this -- ARRL
> Antenna book??): the sq.ft. and force specs for the tower assume that
> the antenna is immediately at the top of the tower, not 10' or more above.
>
> Alan AB2OS
>
>
>
_______________________________________________
See: http://www.mscomputer.com for "Self Supporting Towers", "Wireless Weather
Stations", and lot's more. Call Toll Free, 1-800-333-9041 with any questions
and ask for Sherman, W2FLA.
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