Supersonic Marker Beacon Antenna

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Supersonic Marker Beacon

The 21-20-29 is a lightweight Marker Beacon Antenna suitable for Instrument Landing Systems (ILS) installations on Subsonic and Supersonic 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 required
Designed to MIL-STD-810 environmental conditions
DC Grounded antenna element

	21-20-29
Model #	21-20-29
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	TNC Female

Construction	High density foam filled epoxy/fibre glass shell set in aluminium alloy base collar
Height	1.9 inches (48.3mm)
Length	9 inches (228.6mm)
Weight	0.6616 lb (0.3 kg) max
Base Plate Shape	Oval
Fixing Holes	6 x Ø 0.2 inches (5.1mm) holes , counter bored 0.5 inches (12.7mm)