UHF Phase Matched Airborne Blade Antenna

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UHF Blade Phase Matched Antenna

The 21-30-18PM is a high performance UHF 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 21-30-18PM 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.

High Strength Composite Blade with Aluminum Alloy Base Block
Low Side Area, Low Drag
Single ‘N’ Type Connector
Approved as AS-3984/ARC NSN 5985-01-285-9817
Meets Lightning Strike Criteria of AS-3191
Environmental Performance to MIL-STD-810
Foamed in place radiating element.
Phase matched to 1 degree
Sold as pairs
Drop-in replacement for Cubic P/N 235890-1

	21-30-18PM
Model #	21-30-18PM
Brand	Cooper Antennas

Frequency	225 to 400 MHz
Gain	+3 dBi
VSWR	≤ 2.5:1
Impedance (nominal)	50 Ohms
Power	100 Watts CW
Phase matched	±1 degree (225 - 300 MHz)
Polarization	Vertical
Radiation	Nominally omni directional in azimuth plane
Antenna RF Connector	N Female

Antenna Shell Type	Epoxy/fiberglass blade in aluminum alloy base collar
Height	9 inches (229mm)
Weight	0.9 lbs (0.4kg) each
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)
Number of Antennas	2 phase matched antennas in a box