ANTENNAS AMPLIFIERS PA144-432-25-4.5-2CAP Excellent Light Weight Two Band Yagi Antenna User Manual

ANTENNAS AMPLIFIERS PA144-432-25-4.5-2CAP Excellent Light Weight Two Band Yagi Antenna User Manual

The “Dual” company has been producing antennas for over 34 years.

Our focus is on:

• Wide bandwidth – no tuning antennas
• Designs that work well in all weather conditions
• Low SWR and superior G/T, F/B and F/S ratios across the entire band
• Excellent mechanical properties
• High durability, built without compromise

A Major advance in Amateur Radio antenna design.

All antennas have been calculated using state of the art full 3D Electromagnetic Simulation Software including the influence of the boom, bracket, baluns and connectors.

The performance of antennas designed using these techniques are exceptional, far better than antennas designed using “wire” programs like EZNEC Pro/4 –NEC v5.0, 4NEC2, MMANA or AO These programs cannot calculate the effect of any metallic or dielectric structures near the antenna elements and therefore must be considered inaccurate

Designs are optimized using the Particle Swarm algorithm, which is considered one of the best antenna optimization algorithms available, followed by a classic Nelder-Mead Simplex algorithm for fine-tuning.

Our antennas are precision instruments, they really are “Precision Antennas” (PA).

Specifications

Electrical Specifications 2 m

• Frequency Range: 144 – 145 MHz
• Free Space Forward Gain: 13.9 dBi
• Front to Back Ratio: 27 dB
• 3 dB Horizontal Beamwidth: 38.8°
• Polarization: Horizontal
• Nominal Input Impedance: 50 Ohms
• SWR Across Entire Band: < 1.2
• Maximum Power Input: 1500W
• Matching Method: Direct feed through common mode balun
• Connector: “N”
• Coupling to 70cm: -40 dB

Mechanical Specifications 2 m

• Number of Elements: 9
• Element Diameter: 8 mm Aluminum tube
• Dipole Diameter: 8 mm Hard Copper tube
• Longest Element: 1035 mm
• Element Mounting Position: Below the Boom
• Balun and Connector: Included

Electrical Specifications 70 cm

• Frequency Range: 432 – 434 MHz
• Free Space Forward Gain: 16.4 dBi
• Front to Back Ratio: 28 dB
• 3 dB Horizontal Beamwidth: 26.9°
• Polarization: Horizontal
• Nominal Input Impedance: 50 Ohms
• SWR Across Entire Band: < 1.2
• Maximum Power Input: 850W
• Matching Method: Direct feed through common mode balun
• Connector: “N”
• Coupling to 2m: -30 dB

Mechanical Specifications 70 cm

• Number of Elements: 16
• Element Diameter: 4 mm Aluminum rod
• Dipole Diameter: 8 mm Hard Copper tube
• Longest Element: 340 mm
• Element Mounting Position: Above the Boom
• Balun and Connector: Included

Common Mechanical Specifications

• Boom Length: 4.35 m
• Boom Size: Tapered Boom 20x20mm, 30x30mm, 20x20mm
• Number of Boom Pieces: 4
• Guy Rope Support: No
• Mounting Mast Diameter: 43 – 70 mm 1-11/16″ – 2-3/4″ OD
• Survival Wind Speed: 150 km/h
• Wind Load: 0.12m²
• Transportation Length: 1.2 m
• Net Weight: 4.6 kg
• Gross Weight: 5.6 kg

Horizontal Stacking Distance 2950 mm

Two Antennas Gain on 2 m 16.75 dBi (+2.85 dB)
Two Antennas Gain on 70 cm 19.4 dBi (+3 dB)

Vertical Stacking Distance 2650 mm

Two Antennas Gain on 2 m 16.72 dBi (+2.82 dB)
Two Antennas Gain on 70 cm 19.4 dBi (+3 dB)

Four Antennas in “H” configuration 2950 x 2650 mm

Gain on 2 m 19.6 dBi (+5.7 dB)
Gain on 70 cm 22.4 dBi (+6 dB)

Radiation Patterns:

• 2 m Azimuth Radiation Pattern
  

• 70 cm Azimuth Radiation Pattern
  

Assembly instruction

Join the boom.

Not all pictures are related to the particular antenna.

Put the boom on the flat surface. Because of length you should tighten screws lightly for the first moment. Then look along the boom to see if any distortion occurs. When you are satisfied tighten firmly. Before tightening all screws, apply thread lock like Loctite 243 or Permatex Threadlocker BLUE.

Attach the elements (number to number).

Starting with 1, paying special attention on orientation.

Not all pictures are related to the particular antenna.

Required torque 2.2 Nm for 8 mm elements and 1.4 Nm for 4 mm elements.
If needed align elements and screw tightly. Elements must stand in one plane.

Attach the dipoles.

Assemble and attach antenna mounting bracket.

Raise the antenna. Measure SWR. It must be as predicted or very close on all frequencies. Low SWR is a sign that you assembled everything correctly. Best DX.

Support

Company Dual The largest antenna and ham radio equipment manufacturer in Serbia, established 1988
Trg puk. D. Gavrilovica 2, 37000 Krusevac, Serbia.
www.dual.rs
https://antennas-amplifiers.com/
info@antennas-amplifiers.com
Tel:+381 37 3419 100, +381 69 3419 100

References

• Ham Radio Antennas Band Pass Filters Preamplifiers Dividers
• Proizvodnja antena, kablovske opreme i elektronike
• Ham Radio Antennas Band Pass Filters Preamplifiers Dividers

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