[Top] [All Lists]

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

Subject: Re: [TowerTalk] Need help identifying an old tri-bander
From: N6FD <>
Date: Sun, 16 Jan 2011 22:49:19 -0800
List-post: <">>
Thanks to the list for such a prompt answer.  After downloading the 
manual, it indeed does appear to be an ATB-34.  Now I just have to 
refurbish the traps, replace some lost hardware and get the tower up.  
Thanks again to the experts on the list.

73, Erich N6FD

On 1/16/2011 8:05 PM, N6FD wrote:
> 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
> _______________________________________________
> _______________________________________________
> TowerTalk mailing list

TowerTalk mailing list

<Prev in Thread] Current Thread [Next in Thread>