A144S5 & A144S10
2 Meter Yagi Antenna
Specications
A144S5 (5 Element) A144S10 (10 Element)
Frequency:
Power Rating:
Impedance:
VSWR:
Front To Back Ratio:
Boom Length:
Longest Element:
Driven Element diameter:
Parasitic Elements diameter:
Max. Mount diameter:
Weight:
Connector:
144-148 MHz
:niaG
9.1dBi
100W PEP, 50W FM
50 Ohms (Nominal)
1.4:1 (Nominal)
More than 14 dB
37.4” 950mm
42.9” 1090mm
0.50” 12.7mm
0.37” 9.4mm
1.5”
1.8 lbs. 0.81 kg
SO-239 UHF Female
144-148 MHz
11.6 dBi
100W PEP, 50W FM
50 Ohms (Nominal)
1.4:1 (Nominal)
More than 15 dB
83.8” 2130mm
42.9” 1090mm
0.50” 12.7mm
0.37” 9.4mm
1.5”
2.4 lbs. 0.81 kg
SO-239 UHF Female
Antenna Assembly
(1) Remove antenna from package and adjust elements to proper position. You will nd a small mark on the center of each
element to aid in its positioning. Tighten each wingnut after verifying proper positioning.
(2) Weatherproong connections. As coaxial cables tend to absorb moisture through their connectors, it is recommended
that the connector be sealed. There are several products available for this purpose, including a good grade of electrical type
or a rubber compound tape.
Figure 1
← 6” →
Fabricated
extension
Figure 2
DIAMOND ANTENNA Products are distributed by RF PARTS COMPANY
435 S. Pacic S treet San Marcos, CA 920 78 (770) 614-7443
↑
www.diamondantenna.net
The Diamond 2 Meter Beam Antennas are easy to assemble and install. Only a few cautions are necessary in their installation.
The A144S5 may be installed for either vertical or horizontal polarization.
(a) Vertical polarization (preferred for FM operation): If mounting to a vertical support or pole at the boom center, be
sure this support is non-metallic. A berglass or waterproofed hardwood extension should work satisfactorily. End mounting is a
good option, as the coax cable may be run along the boom and down the vertical support. The idea is to minimize the eects of
metal in the vertical plain. It will be necessary to fabricate an extension capable of sliding inside the boom, being secured by the
screw passing through the boom (at the reector element). Another way of mounting vertical beams is on a bracket to position
beam away from the vertical support in order to reduce its eects. Coax should be run away from the beam at right angles (or o
the reector end). See Figure 2.
(b) Horizontal mounting to the vertical support is easily accomplished with center boom mounting.
(c) Phasing of two beams may
be accomplished with a special coax phasing section using 75 ohm coaxial cable and T-
connector. Length approximately 2140 mm / 84 inches. Beam separation of approximately 40”-48” is recommended.
Note that the two antennas are mounted to the stacking boom in the same position. The cable connection must enter
each from the same side as shown in Figure 4.
Position element for
center marker
Tighten Wingnuts
Figure 3
Figure 4
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