Diamond Antenna V2000A User manual

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V2000A
6m/2m/70cm Triband Base Antenna
The V-2000A is the U.S. version of the V-2000 Tri-Band Antenna. This antenna has
been optimized for the U.S. FM Bands. Diamond MX-2000 Triplexer is required for
multiband operation.
The V-2000A utilizes a linear phase shift design to couple the different frequency
band sections together. The antenna functions as a 1/2 wavelength counterpoise,
two 5/8 wavelength elements are 70cm. A watertight joint assembly connects the
two antenna sections into one ridged assembly. The resulting antenna has the same
strength as a one piece structure.
Specifications
Frequency: 52-54 MHz, 144-148 MHz, 440-450 MHz
Gain: 2.15dBi (6m), 6.2dB (2m), 8.4 dB (70cm)
Impedance: 50 ohms nominal
VSWR: 1.5:1 (typical)
Power Rating: 150 watts
Element Phasing: (6m) 1/2 wavelength (incl. counterpoise)
Element Phasing: (2m) Two 5/8 wavelength
Element Phasing: (70 cm) Four 5/8 wavelength
Radials: Three
Grounding: DC ground. Antenna element and radials
connected to mounting pipe.
Max Wind Rating: 112 m.p.h.
Mast Dia. Acceptance: 1.2 to 2.4 inches
Length: 8.3 ft.
Weight: 2.6 lbs.
Connector: SO-239 female
Req. Triplexer: MX-2000
Limited Warranty: One year against defects in material or
workmanship.
Assembly Instructions
1. Remove antenna sections from package and note how sections are tapered to
fit together at the Section Joint Assembly.
2. Upper & Lower Section Joint Assembly. Lay the Upper and Lower Sections
in a line end to end. Connect the antenna elements at the Element Joint as
seen in Figure 2. Tighten the two set screws. (It may be necessary to slide the
brass antenna element slightly out of the upper section in order to fit into the
Element Joint Coupler.)
3. Carefully insert upper fiberglass section into lower fiberglass section. The
black line should be touching lower section. Slide gasket holder down to meet
lower section joint. Verify proper seating of gasket. Threat upper joint nut
onto lower joint. Verify proper seating of gasket. Thread upper joint nut onto
lower joint. Do not overtighten.
4. Fasten radials and secure lock nuts. Figure 7 depicts 6m counterpoise.
5. 6m Adjustment. Support antenna about 10' above ground. Measure VSWR.
Adjust counterpoise radial length for best VSWR at desired operating

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frequency (see tuning chart below figure 7).
6. Before final installation, check VSWR on 2m & 70 cm. (No adjustment is
possible on these two bands.)
7. Attach mast brackets to Antenna Support Pipe. Pass the coaxial cable
through the bottom of the Antenna Support Pipe. Connect coaxial cable to
the feed point (figure 5). Align hole on Antenna Support Pipe with threaded
hole at bottom of antenna. Insert screw with lock washer and tighten (figure
5).
8. Attach antenna to antenna mast using brackets and hardware kit (figure 6).
We suggest mounting one turn of coaxial cable of approximately 10”
diameter directly beneath the antenna. This will act as an isolation choke. The
coil diameter is not critical—Note: Some cable require a larger diameter coil
to prevent movement of center conductor. Tape coil to mast (figure 6).

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6m Radial Adjustment
6m Center
Frequency Internal Adjustment Length “A” Rod Length “B”
52 MHz 2 5/8” 23”
52.5 MHz 3 5/8” 22”
53 MHz 4 5/8” 21”
53.5 MHz 5 5/8” 20”