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Marker Beacon Antenna

75 MHz

SKU: 21-20-79

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Marker Beacon Antenna

The 21-20-79 is a lightweight Marker Beacon Antenna suitable for Instrument Landing Systems (ILS) installations on helicopters and subsonic aircraft. Its rugged design uses a printed circuit radiating element enclosed within a lightweight glass reinforced composite shell which in turn is bonded into a machined aluminum alloy base plate. This method of construction avoids base delamination problems associated with some other manufacturers designs.

  • Lightweight
  • Small physical size
  • No tuning require
  • Designed to MIL-STD-810 environmental conditions
  • DC Grounded antenna element
  • Direct replacement for NSN 5985-99-723-2258
21-20-79
Model # 21-20-79
Brand Cooper Antennas
Frequency 75 MHz ± 10 kHz 
VSWR ≤ 3.0:1 
Impedance (nominal) 50 Ohms
Polarization Predominantly Horizontal
Radiation Downward lobe
Antenna RF Connector  BNC Female
Construction Fiberglass shell/ Aluminum base 
Height 1.9 inches (48.3mm) 
Length 9 inches (228.6mm) 
Weight 0.75 lb (0.34kg) max 
Base Plate Shape Oval
Fixing Holes 0.234 / 0.208 inches (5.9 / 5.3mm) holes , counter bored 0.5 inches (12.7mm)

Finish

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

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