UHF Airborne Blade Antenna

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The 21-30-22 is an airborne blade antenna designed for helicopters and high performance aircraft covering UHF/FM radio frequencies. It is a direct footprint replacement for AT256 UHF Blade antennas.

Electrical design is based on a 2-dimensional, discone which is of high efficiency and provides nearly omni-directional azimuthal radiation.

Mechanical design uses an advanced, glass-loaded thermoplastic radome with an integral radiating element, all foamed-in-place for structural and environmental integrity.

The blade is built into a contoured aluminium alloy base collar and has a centrally mounted, N-type female coaxial connector.

Different base configurations can be provided.

Covers Civil and Public Service UHF FM Band
Low profile, diamond shaped blade
Fully environmentally sealed
Lossless matching - high RF efficiency
Omni-directional radiation pattern
Single N-type female connector
High impact strength glass loaded thermoplastic shell

	21-30-22
Model #	21-30-22
Brand	Cooper Antennas

Frequency	225 to 407 MHz
Gain	+2 dBi
VSWR	≤ 2.0:1
Impedance (nominal)	50 Ohms
Power	100 Watts CW
Polarization	Vertical
Radiation	Omni-directional in azimuth, similar to stub in elevation
Antenna RF Connector	N Female

Antenna Shell Type	Glass-loaded thermoplastic blade in aluminium alloy base collar
Height	6 inches (152.4 mm) max
Weight	0.9 lbs (0.41 Kg) max
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)