[TowerTalk] Vertical Antenna Tubing Strength (was: Increasing effective 4SQR array bandwidth???

[Hisashi T Fujinaka]

Isn't there something called wellcasing? I'm sorry to be guessing, but I
think that's what w7rr used for his foursquare.

On Thu, 30 Aug 2001, Richard Karlquist wrote:

>
> The secret to using 4 inch irrigation tubing is to never drill
> holes in it.  Only clamp it using 4 inch Sch. 40 PVC pipe
> as a collar.  The nominal I.D. of that pipe is 3.999 inches
> so it is a perfect fit for 4 inch O.D. tubing.  Details on
> this at:  http://www.karlquist.com/Irrigation/irrigation.html
>
> richard@karlquist.com
> www.karlquist.com
>
> >N6BV wanted me to write our experiences but I was too embarrassed to go
> through
> >all our blunders. Sometimes the verticals were up for only three days
>
> >We did try 4" irrigation pipe but the diameter did not overcome the
> weakness of
> >the thin wall. After more than 2 years of trying different designs we ended
> up
> >where we are now. Great bandwidth with 2" pipe.
>
> >Dick -  KB1H

-- 
Hisashi T Fujinaka - htodd@twofifty.com
BSEE (6/86) + BSChem (3/95) + BAEnglish (8/95) + $2.50 = mocha latte


List Sponsored by AN Wireless:  AN Wireless handles Rohn tower systems,
Trylon Titan towers, coax, hardline and more. Also check out our self
supporting towers up to 96 feet for under $1500!!  http://www.anwireless.com

-----
FAQ on WWW:               http://www.contesting.com/FAQ/towertalk
Submissions:              towertalk@contesting.com
Administrative requests:  towertalk-REQUEST@contesting.com
Problems:                 owner-towertalk@contesting.com