Fast Tune VHF/UHF Antenna

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The 21-140-136 is the latest in a series of high gain, digitally tuned VHF/UHF antennas providing outstanding VHF and UHF performance in a 14.7 inch tall structure. This antenna has the additional benefit of having the same footprint size and fixings as AS3191. Latest p-i-n diode tuning technology for VHF band combined with a passive susceptance corrected element for the UHF band provides exceptional gain over a very wide band. A separate, lightweight logic converter unit (LCU) accepts data from the VHF/UHF radio, and using latest FPGA technology, provides tuning codes for the antenna. Tuning time, which is 100% radio silent, is typically 50µ second (see separate datasheet).

Radio silent tuning within typically 50µS via separate Logic Converter Unit
14.7 inches height gives exceptional SINCGARS Gain
Rugged design has no forward facing projections for ground handling and in-flight safety
Designed for helicopters and subsonic fixed wing aircraft to MIL-STD-810 environmental conditions
Continuous coverage 30-174 MHz
Footprint and fixing compatible with AS3191

	21-140-136
Model #	21-140-136
Brand	Cooper Antennas

Frequency	30-174 MHz continuous 225-600 MHz
Gain (typical)	≥ - 7.5 dBi (30 MHz) ≥ - 1 dBi (88 MHz) 0 dBi average (118-174 MHz) + 2 dBi average (225-600 MHz)
VSWR	≤ 2.5:1 (≤ 3.5:1 88-117.95 MHz)
Impedance (nominal)	50 Ohms
Power	50 Watts UHF 30 Watts VHF (35 Watts with duty cycle)
Tuning Time	Less than 50µ seconds
Polarization	Vertical (when vertically mounted)
Antenna RF Connector	TNC Female
DC Connector	D38999/49WB35PN

Height	14.7 inches (374mm) max
Weight	4 lbs (1.8kg)
Fixing Holes	6 x Ø 0.208 inch holes for 10:32 UNF holes or similar
ENVIRONMENTAL
Temperature	-54° to +80° C (Operating)
Operating Speed	Up to Mach 0.85