[TowerTalk] Mystery tribander

[Roger K8RI on Tower]

Or it could be a Cushcraft ATB-34.

How is the driven element attached to the boom?  If it fits into a
cylindrical phenolic insulator it is *probably* the ATB34.  They normally
used a balum but direct coax connections were not unusual with about a 10
turn choke.  The line/balun was attached to the driven element of the
ATB-34 with single 1/4-20 SS screw on each side which turned in to hold the
element, while  locking nuts and washers held the line/balun.   If that
doesn't describeit, then it's not an ATB-34.

HyGain made one as well, (TH-4 I believe). At any rate they also had one
with three elements with traps and one single element used as a 10meter
reflector.  So, although the antenna had 4 elements it really operated as a
three element on each band with better spacing for the 10 meter reflector
had it been part of the longer reflector with traps.

There are a lot of similarities between the various makes for this
particular antenna, but each tended to use a slightly different method of
feeding and mounting the drivern element.

Roger Halstead (K8RI and ARRL 40 year Life Member)
N833R - World's oldest Debonair CD-2
www.rogerhalstead.com




> In a message dated 4/28/2005 8:57:44 PM Central America Standard Tim,
> c_hurlbut at adelphia.net writes:
> Here is the problem.  It *looks* like it has 2 elements on 15 and 20,
> and 3 elements on 10, the 3rd element being a non-trapped 10m only.
> Does this sound familiar to anyone?
> Sounds to me like my Mosley Classic CL-36 tribander.
>
> Dave, WT8R
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