VHF / UHF Airborne Emergency Locator Transmitter Antenna

Calculate Shipping

Freight to be quoted - $0.00
As the size and weight is not normally known we use several freight carriers to ensure you get the best price. Complete your order or quote and we will get back to you with the available freight options.

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).