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Re: [TowerTalk] Cushcraft 40-2CD Repair

To: <towertalk@contesting.com>
Subject: Re: [TowerTalk] Cushcraft 40-2CD Repair
From: <john@kk9a.com>
Date: Mon, 12 Aug 2024 16:58:05 -0400
List-post: <mailto:towertalk@contesting.com>
I am not a mechanical engineer or a metallurgist but I believe that the
tensile strength and yield strength for 6061-T6 and 6063-T8 are nearly
identical.  I used to buy 6061-T6 for all of my homebrew Yagis from Shapiro
Metal Supply and certainly did not pay $60-$80 for 72" pieces.  Lately I use
the 6063-T832 that DX Engineering sells.  I really would be surprised if
Cushcraft used 6061-T6, their aluminum always seemed soft to me.

John KK9A


Michael W1ECT wrote:

A couple of years ago we had a big ice storm here that damaged my
Cushcraft 40-2CD (2-el "shorty-forty") antenna.  It's been sitting
it in the basement for quite a while and I've finally gotten around
to refurbishing it.

The worst damage was to the innermost element sections (4) which were
badly bent and need to be replaced. I see that DXEngineering carries
the appropriately sized tubing: 1.250" OD, .058" wall, and 72" length.

Their price is reasonable at $21 each but the alloy is 6063-T832 and I'm
wondering if this will do the job.  I did some searching around the web
for 6061 tubing and found the prices to be around $60-$80 each!

Mike - W1ECT  (b1 at xmlog.com)


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