High Power UHF Airborne Blade Antenna

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The 21-30-17HP is a high power UHF airborne blade antenna suitable for use on fixed and rotary wing aircraft.

Construction is from a one piece glass loaded thermoplastic 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 21-30-17HP to meet the lightning protection requirements of AS-3191/A. Internal radiating element are shaped in such a way as to produce minimum VSWR and also to optimize radiation.

The antenna assembly is sealed by closed cell foam and finished in lusterless black or grey urethane paint.

Covers extended UHF and EPLRS Bands
High Strength Composite Blade with Aluminum Alloy Base Block
Low Side Area, Low Drag  Single ‘N’ Type Connector
Meets Lightning Strike Criteria of AS-3191
Designed to meet Environmental Performance to MIL-STD-810 & MIL-T-5422
Foamed in place radiating element

	21-30-17HP
Model #	21-30-17HP
Brand	Cooper Antennas

Frequency	225 MHz to 512 MHz
Gain	+3 dBi typical
VSWR	≤ 2.5:1
Impedance (nominal)	50 Ohms
Power	200 Watts CW
Polarization	Vertical (when mounted vertically)
Radiation	Omni directional in azimuth plane
Antenna RF Connector	N Female

Antenna Shell Type	Glass loaded thermoplastic blade in aluminum alloy base collar
Height	9 inches (229mm)
Weight	0.875 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)