Ian,
The antenna you are inquiring about was the model DL-TRI by Delta Loop
Antenna, Inc. of Weston, VT (previously in New Milford, CT). The company is
no longer in business. The owner, Robert Hobert, KA1UJ is, I think, a SK.
The array is very strong, using none of the standard U-bolt type clamps.
Element-to-boom and boom-to-mast joints are all done with heavy-duty solid
machined aluminum parts, not castings, and stainless steel hardware. Two of
the 3 sides were made of aluminum tubing that rose from the boom at an angle
with a copper wire stretched across the top for the 3rd side of the delta
loop.
I purchased what may be one of the last DL-TRI's back in April 1993, when he
was not actively building any arrays with 10 Meter capability due to the low
sunspot activity at that time. The array included 2 elements on 20 and 15
meters plus 3 elements on 10 meters and weighed 81 lbs when fully assembled
on a 13.5 ft boom. Each band was fed with separate feedlines through gamma
matchs affixed to the boom. There was a review of the DL-TRI in CQ in June
1988 by Lew McCoy, W1ICP.
I have never gotten around to building the full array due to tower
restrictions in my neighborhood. Right now I am using the 3 element 10 meter
delta loop portion mounted on a military surplus AB-577 crank-up mast for
several contest operations per year.
73,
Henry Pollock - K4TMC
Raleigh, NC
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