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UHF Airborne Blade Antenna

291.4 ± 0.5 MHz

SKU: 21-30-24-1

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UHF Airborne Blade Antenna

The 21-30-24-1 is an airborne blade antenna designed for helicopters and high performance aircraft covering the UHF Sonobuoy Command frequency. It is a direct footprint replacement for AT256 UHF Blade antennas.

Electrical design is based on a 2-dimensional, monopole which is of high efficiency and provides nearly omni-directional azimuthal radiation.

Mechanical design uses an advanced, glass-loaded thermoplastic radome with an integral radiating element, all foamed-in-place for structural and environmental integrity.

The blade is built into a contoured base collar and has a centrally mounted, N-type female coaxial connector on an aluminium alloy baseplate to which the radiating element is DC grounded for p-static protection. 

21-30-24-1
Model # 21-30-24-1
Brand Cooper Antennas
Frequency 291.4 ± 0.5 MHz
Gain ≥2 dBi 
VSWR ≤ 2.0:1 
Impedance (nominal) 50 Ohms
Power 30 Watts CW 
Polarization Vertical
Radiation Omni-directional in azimuth, similar to stub in elevation
Antenna RF Connector  N Female
Antenna Shell Type Glass loaded thermoplastic blade
Height 5.8 inches (147.3 mm) max
Weight 0.75 lbs (0.34 Kg) max 
Side Loading ≥ 8 psi ultimate
Base Plate Shape Diamond shape 
Fixing Holes 6 x Ø 0.203 inch (5.2 mm) holes, counter bored Ø 0.43 inches (10.9 mm) 

Finish

  • Urethane Lusterless Black
  • Other finish options are available.
  • Please specify finish required when ordering.
Datasheet:

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