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VHF/UHF Airborne Blade Antenna

30 to 88 MHz, 108 to 174 MHz and 225 to 512 MHz

SKU: 21-50-44

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VHF/UHF Airborne Blade Antenna

The 21-50-44 is a tri band VHF/UHF communications antenna intended for use on high speed aircraft, suitable for use with multi-mode radios such as AN/ARC-210. Its construction is from precision machined aluminium alloy with high strength glass/epoxy inserts. Having a low profile diamond shape raked blade structure minimizes drag for high speed applications and presents a low Radar Cross Section (RCS). The aluminium structure also lends itself to the application of certain types of ‘stealth’ radar absorbing material.

The electrical design comprises a UHF sleeved unipole, the upper element of which acts as a "choke" enabling a capacitive horizontal rod with selective resistive matching to operate as a top loaded VHF monopole, decoupled from the UHF section. A small in-line passive matching unit (part number 21-80-50), supplied with the antenna matches VSWR in the low VHF band.

Designed and constructed to meet MIL-STD-810C environmental conditions, the 21-50-44 is a drop-on footprint replacement for UHF blade type AT-256, having a single N-type Female connector. The antenna is normally finished in lusterless grey urethane paint. 

21-50-44
Model # 21-50-44
Brand Cooper Antennas
Frequency

30 - 88 MHz

108 - 174 MHz

225 - 512 MHz

Gain

30 - 88 MHz -23 dBi rising to -8 dBi

108 - 174 MHz -5 dBi min +1 dBi average

225 - 512 MHz +1 dBi average 

VSWR

30 - 88 MHz ≤ 2.5:1

108 - 117 MHz ≤ 3.0:1

118 - 174 MHz ≤ 2.5:1

225 - 450 MHz ≤ 2.5:1

451 - 512 MHz ≤ 5.0:1 

Impedance (nominal) 50 Ohms
Power 25 Watts CW
Polarization Vertical
Radiation Pattern Omni directional in azimuth 
Antenna RF Connector N Female
Antenna Shell Type Diamond shaped aluminum alloy with fiberglass inserts 
Height 12.42 inches (315 mm) 
Weight 3.5 lbs (1.59kg) (including 21-80-50 matching unit) 
Base Plate Shape Diamond shape drilled to replace AT-256
Fixing Holes 6 x Ø 0.200 inches (5mm) holes, counter sunk at 100° Ø 0.39 inches (9.9mm) 

Finish

  • Matching Unit Urethane Lusterless Black
  • Antenna - Urethane Lusterless Grey
  • Other finish options are available.
  • Please specify finish required when ordering.
Datasheet:

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