VHF/UHF/L-Band Antenna

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VHF/UHF/L-Band Antenna

The 21-50-318 is a high speed passive blade antenna providing full VHF, UHF and L-band performance in a double raked, low RCS design. Intended as a bolt on replacement for existing UHF/L-band and VHF/ UHF/L-band antennas, this antenna is built using a high temperature resin/glass composite radome encapsulating a wide band, specially contoured radiating element. A high isolation diplexer is built into the machined aluminium base, allowing simultaneous operation of LOS Communications and L-Band/Data link systems such as JTIDS, MIDS and IFF. Lightning and P-static protection is provided by all elements being DC grounded.

Swept back blade
Isolated V/UHF and L-band outputs
Suitable for Mach 2+
Gain in UHF and L-band similar to stand-alone blades
Nominally Omni pattern thru band
Drop on replacement for NSN 5985-01-329-4335
Designed to MIL-STD-810 environmental conditions

	21-50-318
Model #	21-50-318
Brand	Cooper Antennas

Frequency	30-174 MHz 225-512 MHz 960-2500 MHz
Gain	30 MHz ≥ -26 dBi 88 MHz ≥ -14 dBi 174 MHz ≥ - 4 dBi 225-410 MHz 0 dBi average 960-2500 MHz 0 dBi average
VSWR	30 - 88 MHz ≤ 2.7 108 - 174 MHz ≤ 2.7 225 - 360 MHz ≤ 2.0 360 - 410 MHz ≤ 2.2 410 - 512 MHz ≤ 3.5 960 - 2500 MHz ≤ 2.0
Impedance (nominal)	50 Ohms
Power	VHF/UHF : 25 Watts CW 100 Watts peak L-Band : 2 KW Peak at 0.004 duty cycle
Polarization	Vertical
Radiation Pattern	Nominally Omni-directional in azimuth, see typical plots on 20” radius fuselage section
Isolation	Between V/UHF and L-band (bi-directional) ≥ 50 dB
Antenna RF Connector	SC Female L-band TNC Female V/UHF