Dick Green wrote:
>
> One of our club members sent this query around. Can anyone help identify
> this beam?
>
> >This antenna is a 3-element trap yagi; presumably a tribander. I'm trying
> to
> >figure out the antenna's manufacturer, and then get a copy of the
> >manufacturer's instructions.
> >
> >The seller said the antenna is Moseley TA-33. The mystery beam does
> >superficially resemble a TA-33--the driven element is insulated from the
> boom,
> >each half-element has just one trap and the driven element is fed through a
> >balun.
> >
> >But, unlike a TA-33 the mystery beam does not mount the driven element on
> >insulated stand-offs. Instead, the butt ends of the two driven element
> halves
> >have thick black plastic boots on them and the boots then are inserted into
> an
> >element-to-boom clamp. The driven element-to-boom clamp has a curious mark
> >stamped into the metal--the mark looks like a squared off "G" or perhaps
> the
> >numeral "6."
> >
> >The mystery beam has a 2-inch diameter boom which totals 14 ft. 5 in. long.
> The
> >boom can be disassembled into three pieces. Both ends of the center piece
> are
> >swaged; the end pieces slide over the center piece and are secured with
> clamps.
> >The director end of the boom has a red plastic cap; the cap at the
> reflector
> >end of the boom is black.
> >
> >Each half-element is made up of three pieces of aluminum tubing, plus the
> trap,
> >each of which is secured to the next piece by an aluminum clamp. The clamps
> use
> >a machine screw and nut to draw the clamp up tightly. The traps each are 13
> >inches long and have black plastic caps on each end.
> >
> >The traps and clamps look suspiciously like some on an old HyGain 14AVQ
> trap
> >vertical sitting in my junk pile. Perhaps the mystery beam has a HyGain
> >connection somewhere in its past.
>
> Any help would be appreciated.
>
> 73, Dick, WC1M
>
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My guess it that it is a Wilson SY-33 which is essentially a copy of the
well known TA33.
73s de WA6IBU, paul
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