We just put up a 20' piece of chrome molly tubing for the Tampa Amateur
Radio Club last week. There are five antennas on it. A C-19, a 5 elem 6M
beam and long boom beams for 2M, 70Cm and 1.2Gz.
I can tell you that it moves around in a slight breeze . It hasn't been up
long enough for me to have had a good look at it in a stiff breeze but I
would expect it's going to move around a lot.
I was once told that what doesn't bend or flex breaks.
We also have a 25' piece of 3/8" wall chrome molly and when you pick up one
end of it there is quite a bit of bend in the middle of the tube.
As was mentioned earlier use the MARC program and run the numbers, if they
come out OK don't worry be happy.
----- Original Message -----
From: "Tower (K8RI)" <firstname.lastname@example.org>
Sent: Monday, November 22, 2004 11:58 PM
Subject: [TowerTalk] Chrome Molly tube.
> I'm looking for some chrome molly tube to replace the structural steel I'm
> using now.
> I currently have 2 22-23 foot long pieces of 1 1/2 inch with 1/4 inch wall
> butt welded together. Over the splice is a 24 foot length of 2" which
> nicely fits over the 1 1/2.
> This is on a 97 foot ROHN 45-G.
> There is a TH5 at 100 feet, mounted on the 2" pipe.
> At 115 feet there is a 7-L 6-meter C3i Yagi mounted on the 1 1/2 pipe
> at the top of the 2".
> At 130 feet is a pair of 12 L vertically polarized 2-meter yagis on a 14
> foot cross boom.
> There is a pair of 11 L vertically polarized 440 yagis inboard of the
> 2-meter yagis on the same boom.
> When the winds hit 50 to 70 MPH the thing looks like a blue gill fly rod
> that just tied into a Bass. I find it amazing the VHF and UHF antennas
> held together for two winters.
> My thoughts are the Chrome molly tube would be more rigid, albeit a whale
> a lot more expensive.
> Any thoughts? Socially acceptable suggestions?
> Roger Halstead (K8RI, EN73 & ARRL Life Member)
> N833R, World's Oldest Debonair (S# CD-2)
> 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
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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