VHF / UHF Airborne Emergency Locator Transmitter Antenna
121.5 MHz and 243 MHz
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
|Frequency||121.5 MHz and 243 MHz|
≥ - 5 dBi (VHF)
≥ + 2.5 dBi (UHF)
|Impedance (nominal)||50 Ohms|
|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).|
- Urethane Gloss White
- Other finish options are available.
- Please specify finish required when ordering.