On 1/16/2011 11:23 PM, Jim W7RY wrote:
> 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.
IIRC my ATB43 had 3 elements with traps and a single 10 meter reflector
with no traps.
I do remember the driven element went into a phenolic tube which was
held in place by two 1/4-20 SS round head screws. These screws also
served as the electrical contacts to the driven element from the balun.
The leads from the balun (bout 1/4" wide Al strap) were held between
two SS nuts on those same 1/4-20 SS screws.
I remember that driven element well as that was a weak point for bad
connections. About once every two years the antenna would get flaky.
All I had to do was tighten those screws and it'd go back to working find.
> Jim W7RY
> From: "N6FD"<email@example.com>
> Sent: Sunday, January 16, 2011 8:05 PM
> To: "Tower Talk"<firstname.lastname@example.org>
> 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
>> 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
>> 73, Erich
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