Marker Beacon Antenna

Datasheet

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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)