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ELT Airborne Blade Antenna

121.5, 243 and 406 MHz

SKU: 21-50-40

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ELT Airborne Blade Antenna

The 21-50-40 is a high performance V/UHF airborne three frequency ELT blade antenna suitable for aircraft installation.

Construction is from a one piece glass loaded thermoplastic blade molding intimately bonded into an aluminum alloy base block which houses the matching circuits and provides for very solid attachment to the airframe via 6 fixing holes drilled to the same pattern as the AT-256 UHF antenna.

The metal base block also enables the 21-50-40 to meet the lightning protection requirements of AS-3191/A.

Internal radiating element are shaped in such a way as to produce minimum VSWR and also to optimize radiation. The antenna assembly is sealed by closed cell foam and finished in lusterless black or grey urethane paint.

  • Covers 121.5, 243 and 406 MHz without tuning
  • High Strength Composite Blade with Aluminum Alloy Base Block
  • Low Side Area, Low Drag  Single TNC Type Connector
  • Meets Lightning Strike Criteria of AS-3191
  • Environmental Performance to MIL-STD-810  
21-50-40
Model # 21-50-40
Brand Cooper Antennas
Frequency 121.5, 243 and 406 MHz 
Gain

+ 2dBi (UHF)

- 2dBi (VHF)

VSWR

2.0:1 max @ 121.5 and 243 MHz

1.5:1 max @ 406 MHz 

Impedance (nominal) 50 Ohms
Power 25 Watts CW
Polarization Essentially Vertical (when mounted vertically) 
Radiation Pattern Nominally omni directional in azimuth plane 
Antenna RF Connector TNC Female
Antenna Shell Type Thermoplastic/glass blade in aluminum alloy base collar 
Height 9 inches (229mm)
Weight 2 lbs approx. (0.9kg) 
Base Plate Shape Diamond shape 
Fixing Holes 6 x Ø 0.203 inch (5.2mm) holes, counter bored Ø 0.43 inches (10.9mm) 

Finish

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

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