VHF Airborne Blade Antenna
70 to 80 MHz
The 21-20-75 is a high performance VHF receive only airborne blade antenna suitable for use on fixed and rotary wing aircraft.
Construction is from a one piece fiberglass blade molding intimately bonded into an aluminum alloy base block which houses the matching circuits and provides for very solid attachment to the airframe via 6 fixing holes drilled to the same pattern as the AT-256 UHF antenna.
The metal base block also enables the 21-20-75 to meet the lightning protection requirements of AS-3191/A.
Internal matching elements produce minimum VSWR and enable close phase/amplitude matching making these antennas suitable for use in homing and DF systems. The antenna assembly is sealed by closed cell foam and finished in lusterless black paint.
|Frequency||70 MHz to 80 MHz|
|Gain (typical)||-20 dBi|
|Impedance (nominal)||50 Ohms|
|Polarization||Vertical (when mounted vertically)|
|Radiation||Omni directional in azimuth plane Elevation - see graph|
|Antenna RF Connector||N Female|
|Construction||Epoxy/fiberglass blade in aluminum alloy base collar|
|Height||9 inches (229mm)|
|Weight||0.9 lbs (0.4kg)|
|Side Loading||≥ 8 psi ultimate|
|Base Plate Shape||Diamond shape|
|Fixing Holes||6 x Ø 0.203 inch (5.2mm) holes, counter bored Ø 0.43 inches (10.9mm)|
- Urethane Lusterless Black
- Other finish options are available.
- Please specify finish required when ordering.