if you can find the July 1989 ham radio on page 38 they had an article
Design data for pipe masts which may be helpful.
At 02:24 PM 2/24/03 -0500, you wrote:
>I believe what you are describing is not only practicable, it has been done
>many times before. QST, years ago (at least 25years) had a how-to-do article
>on this type of tower which incorporated used oil field pipe. It also had a
>tilt-over feature which made it very easy to install the antenna at the top.
>A base pipe about 20 or 25 feet long was buried in concrete to about 6 or 7
>feet and the tower was attached at the top at its balance point. A winch was
>installed on the base pipe where the bottom of the tower contacted the base.
>With the tower balanced, the weight of the beam allowed it to swing over and
>it could then be pulled vertical with the winch.
>The one I saw moved slightly in the wind which is to be expected. The main
>objection to this type of tower probably is the mounting of the rotator if
>you put a yagi on top.
> I would like to build this type of tower just to raise and lower wire
>antennas for 160 and 80 meters. I think I could go to 100 feet since only
>wires would be used, not a yagi or other attachment with a higher windload.
>I did a search on the web using Google last night looking for the OD and ID
>of aluminum irrigation pipe but found nothing helpful. If you run across any
>articles or design data, please let me know. Good luck es 73.
>Jan Rehler, W5KNZ, Corpus Christi, Texas
>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.
>TowerTalk mailing list
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