VHF / UHF Airborne Emergency Locator Transmitter Antenna

121.5 MHz and 243 MHz

SKU: 21-20-40

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VHF/UHF Airborne ELT Antenna

 The 21-20-40 is an externally mounted airborne Emergency Locator Transmitter (ELT) dual band antenna operating at 121.5 MHz and 243 MHz.

A fiberglass rod with an internal element is fitted into an aluminum base which contains foamed-in place matching circuits capable of handling up to 50 Watts power.

The method of construction provides protection from severe environmental conditions including high vibration, shock and temperature variations.

Each 21-20-40 is supplied complete with 5 feet of coaxial cable terminated in a BNC male connector. 

  • Dual Band 121.5 and 243 MHz
  • Suitable up to 350 Knots
  • Meets requirements of TSO C91
  • Fully Environmentally Sealed
  • Meets AS-3191 Lightning Strike Criteria
  • Less than 10 inches Height 
21-20-40
Model # 21-20-40
Brand Cooper Antennas
Frequency 121.5 MHz and 243 MHz 
Gain (typical) 

≥ - 5 dBi (VHF)

≥ + 2.5 dBi (UHF) 

VSWR ≤ 2.0:1 
Impedance (nominal) 50 Ohms
Power 50 Watts
Polarization Linear (vertical when vertically mounted) 
Radiation Nominally omni directional in azimuth plane
Antenna RF Connector  BNC Female
Construction Fibreglass whip/ Aluminum base 
Height 10 inches (254mm) 
Weight 0.35 lb (0.16kg)
Base Plate Shape Tear drop
Fixing Holes 4 x Ø 0.170 inches (4.3mm) ±0.005 inches (0.127mm) holes, counter sunk at 100° Ø 0.280 inches (7.1mm). 

Finish

  • Urethane Gloss White
  • Other finish options are available.
  • Please specify finish required when ordering.
Datasheet:

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