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.
- 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
|Frequency||75 MHz ± 10 kHz|
|Impedance (nominal)||50 Ohms|
|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)|
- Urethane Gloss White
- Other finish options are available.
- Please specify finish required when ordering.