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The basic two-element quad antenna, with driven-element loop and reflector loop. The driven loops are electrically one wavelength in circumference
(1/4 wavelength on a side); the reflectors are slightly longer. Both configurations shown give horizontal polarization. For vertical polarization, the driven
element should be fed at one of the side corners in the arrangement at the left, or at the center of a vertical side in the “square” quad at the right.When compared to a Yagi of the same number of elements and boom length, the quad exhibits almost 1.5 dB more gain for the same boom length.
One of the high-points of the QUAD, is its inherent property to have a high immunity to terrestrial noise. The quad’s design emphasizes greater gain for fewer elements. And a final note; The Quad has a sharper beam-width which contributes to the added gain-bandwidth figure.
All Points Favor the Diamond configuration over the Square:
The question of how to orient the spreader arms has been raised many times over the years. Should you mount the loops in a diamond or a square configuration? Should one set of spreaders be horizontal to the earth as shown in Fig 1 (right), or should the wire itself be horizontal to the ground (spreaders mounted in the fashion of an X) as shown in Fig 1.
From the mechanical point of view there is no question which version is better. The diamond quad, with the associated horizontal and vertical spreader arms, is capable of holding an ice load much better than a system where no vertical support exists to hold the wire loops upright. Put another way, the vertical poles of a diamond array, if sufficiently strong, will hold the rest of the system erect. When water droplets are accumulating and forming into ice, it is very reassuring to see water running down the wires to a corner and dripping off, rather than just sitting there on the wires and freezing. The wires of a loop (or several loops, in the case of a multiband antenna) help support the horizontal spreaders under a load of ice. A square quad will droop severely under heavy ice conditions because there is nothing to hold it up straight.
Of course, keep the bottom spreader away from the tower guys when you rotate the antenna.
Hitch Pin Clips are used as "keepers" on many Cubicle Quad antenna spacers. Keep a few "keeper" spares on-hand.
Plated, = zinc-coated.
Made of MB spring wire size=.042
Spring wire Diameter = 3/64
Max Shaft Diameter 5/16"
Overall length = 1 inch
Inside Diameter = 5/16 "
10 for .99 cents BUXCOMM Part No. HPC223
(model JPOL2) 29.95
70cm version: 430-450 mHz(model JPOL4) 24.95
BUX VBALUN De-Coupling transformer
Primary use and application:
Feed point isolation and matching for J-Poles and VHF/UHF BEAMS.
This decoupling transformer prevents RF currents from traveling down the outer shield of the coax. The input connector is an SO239 (female) and the output connector is a PL259 (male).
BUX "VBALUN" De-Coupling transformer, has SO-239 (female) input connector. Output connector is 2 feet RG8X cable with Amphenol PL-259 (male). BUX VBALUN is an UNbalanced to UNbalance decoupling transformer designed to be used by the Apartment dweller or the RV ops when feeding J-Poles and similar VHF/UHF antennas.
$19.95 VBALUN
Teflon ®™ E I DuPont corp.
Amphenol ®™ TYCO Corp.
BUXCOMM, VHF 4 element, full wave Cubicle Quad.
has more gain than a 6 element yagi, and the Quad is inherently immune to terrestrial noise. This two meter quad makes a great antenna to reach out and touch those distant repeaters. One of the outstanding features of the quad is its immunity to terrestrial noise. This feature alone, makes if ideal for our digital modes, including: Packet, EchoLink, Eqso, SSTV, and many more. Because of its highly directional feature, the Quad lets you pick out those distant stations without inter-mod from stations that are slightly off-path. The BUXCOMM Cubicle Quad is extremely light, and comes complete, ready to assemble. Fiber glass boom, and fiber glass spreaders. Boom has provisions to "end mount" the BUX Quad to a tower leg, or center mount to a rotating 1-1/4" mast. Elements are made from Teflon(™ EI DuPont) covered, Silver flashed, stranded wire for good skin-effect, and strength. Assembly time is approximately 1 hour, and you're ready to connect your coax, and have fun.Many VHF DX'ers and SWL's use this Quad to monitor Public Service, Fire & Rescue, and Air-Craft frequencies in distant cities. Until you've tried the BUXCOMM Cubicle Quad, you don't know how much fun you are missing.
2 Meter Specifications:
Frequency Range 143 - 150 Mhz
Vertical or Horizontal polarization
Gain 9.2 dbi
F/B 21.6 db
VSWR Typical 1.05:1
VSWR 2:1 bandwidth >6 Mhz
Impedance 50 ohms
Beamwidth 3 db 65. degrees
Cross Band Isolation 24 db
Power Max 700 watts
Number of elements 4 - #16 Teflon coated, Silver flashed, stranded wire
Boom Length 40"
Mast Mount 1-1/4"
Wind load < 1.0 Sq. Ft.
Weight 3 lbs.
Hitch Pin Clips are used as "keepers" on many Cubicle Quad antenna spacers. Keep a few "keeper" spares on-hand.
Plated, = zinc-coated.
Made of MB spring wire size=.042
Spring wire Diameter = 3/64
Max Shaft Diameter 5/16"
Overall length = 1 inch
Inside Diameter = 5/16 "
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A=Benz-O-Matic propane torch; B=Lead-Free solder; C=Tape
measure: D=Tubing cutter; E=Sharpie marking pen; F=Solder Paste; G=1/2 inch
copper caps; H=Hardcopy of the above drawing; I=Wet Towel; J=PreCut, ready to
assemble parts of the 2 meter J-Pole.
CLICK HERE
AND DESIGN YOUR OWN "J" Pole
Design-A-Quad
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