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Re: [TowerTalk] [Bulk] Re: 2" OD Long Masts

To: "" <>,
Subject: Re: [TowerTalk] [Bulk] Re: 2" OD Long Masts
From: Grant Saviers <>
Date: Tue, 26 Aug 2014 08:47:33 -0700
List-post: <">>
Much cheaper than 4130 is the "1026" alloy A513 72,000psi yield. I see has some 0.120" wall x 2.25" od which would make a great sleeve for 2" masts. They will get full lengths if you ask as they are owned by Thyssen-Krupp or go direct to a service center.

Grant KZ1W

On 8/26/2014 7:48 AM, wrote:
I would run the mast calculator first. Not every mast needs to be 4130 and
most likely 1026 DOM is more than adequate for VHF/UHF yagis.

John KK9A

To:     "'Byron Tatum'" <>,     <>
Subject:        Re: [TowerTalk] 2" OD Long Masts
From:   "Marsh Stewart" <>
Date:   Tue, 26 Aug 2014 08:41:55 -0500

I'd recommend considering chrome molly steel, 1/4" wall, galvanized and
rated at least 100,000 psi mast yield strength. A 22-foot mast like that
weighs about 125 pounds. Then run the calculations for the antennas you want
to stack using their wind load areas, heights above the top of the tower,
and your wind speed.

AntennaMast.xls available on the web for download is easy to use.

Marsh, KA5M

-----Original Message-----
From: TowerTalk [] On Behalf Of Byron
Sent: Tuesday, August 26, 2014 8:23 AM
Subject: [TowerTalk] 2" OD Long Masts

   For years I have used the 2" OD, 6061-T6, 1/4" wall x 24' long aluminum
masts to stack VHF and UHF antennas. I have seen these take a bend a time or
two over the decades.
   I wanted to ask:
     1. If I was to switch to 2" OD steel, as a mast to extend about 15'-18'
out the tower top for stacking VHF/UHF long boom yagis, what would be a
suitable grade of steel, the finish and wall thickness?
     2. I have heard of inserting a smaller aluminum tube inside the 2"
aluminum mast, in the area where the mast exits the tower top and on above a
bit. I wanted to ask if someone here has experience with inserting an
aluminum tube inside the 2" OD mast? I would assume it would be 1-1/2" OD,
of similar material and length and what wall thickness?
   I guess reasons I have stayed with the aluminum masts is that they are
lightweight and easy to handle, plus no rusting down in this Gulf Coast
      Thanks, Byron WA5THJ


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