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[TowerTalk] Fw: Need help identifying an old tri-bander

To: "Tower Talk List" <>
Subject: [TowerTalk] Fw: Need help identifying an old tri-bander
From: "Bill Aycock" <>
Reply-to: Bill Aycock <>
Date: Mon, 17 Jan 2011 20:52:38 -0600
List-post: <">>

-----Original Message----- 
From: Bill Aycock
Sent: Monday, January 17, 2011 8:50 PM
To: Jim W7RY
Subject: Re: [TowerTalk] Need help identifying an old tri-bander

I have an ATB-34, and I just checked some dimensions. It is puzzling,
because the driven element and reflector are almost on, but the Boom is 67"
longer than on the ATB-34 (~211"). I can check some more, if there is a
chance he extended it.

-----Original Message----- 
From: Jim W7RY
Sent: Sunday, January 16, 2011 10:23 PM
To: N6FD ; Tower Talk
Subject: Re: [TowerTalk] Need help identifying an old tri-bander

Sounds like a Cushcraft ATB-34. They were just discussed at length here on
the reflector. Including a link for the manual.

Do a search at the tower talk archives and the manual link should pop up. Or
Google ATB-34 and you'll probably find it.

Jim W7RY

From: "N6FD" <>
Sent: Sunday, January 16, 2011 8:05 PM
To: "Tower Talk" <>
Subject: [TowerTalk] Need help identifying an old  tri-bander

> I bought a tri-bander used from a silent key's estate.  His wife did not
> have any documentation for the antenna.  Given the state of the antenna
> and the tower that I got with it, it was probably put up some time in
> the 70's or 80's.  No markings have survived on the antenna. The
> following are the details of the antenna.  I don't have the original
> spacing between the elements.
> Boom length:  278 inches, in three sections
> Reflector: 382 inches with one set of traps
> Driven element:  317 inches with two sets of traps, center insulated,
> fed with balun
> Director 1:  209 inches, no traps
> Director 2:  293 inches with two sets of traps
> Details:
> Elements are mounted on rectangular aluminum plates, these are attached
> to the boom with U-bolts.  Element sections taper out from the boom.
> Each section is attached by slit tubing and a clamp.  The clamps are
> galvanized steel sheet metal with the clamp nut secured by a small tab
> of the clamp.  The clamp screws are perpendicular to the element.
> The traps have covers that appear to be fiberglass with plastic end caps
> (disintegrating in the environment).  The trap cover has a small weep
> hole in it.  The trap coil is bare aluminum wire secured to the
> fiberglass insulator at each end with a screw.  The wire is covered and
> held in place with a thick black paint.  The 10M trap is 10 turns space
> wound 1 wire diameter apart.  The 15M trap is 16 turns.  The reflector
> has only the 15M trap.
> The driven element is a dipole with a phenolic center insulator.  This
> is clamped to the boom adaptor plate with a couple of U-bolts.  I have
> not had a chance to check the performance of the balun yet.
> If anybody knows what this antenna might be, and where to get a manual,
> please let me know.  I will try to get some pictures up tomorrow to help
> out.
> 73, Erich
> N6FD
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