VHF / UHF Airborne Emergency Locator Transmitter Antenna

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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).