VHF/UHF (SINCGARS/EPLRS) & L-band Spring Mounted Antenna with Detachable element

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VHF/UHF (SINCGARS/EPLRS) & L-band Spring Mounted Antenna with Detachable element

The 20-50-10-3 is a vertically polarized, omni-directional VHF/UHF/L-Band antenna. It is compatible with radios operating in the 30 to 88 MHz, 225 to 450 MHz and 1250 to 2000 MHz frequency ranges. The antenna can handle 100 Watts of power, has separate VHF, UHF and L-Band coaxial connectors and requires no external tuning.

The antenna comprises a VHF monopole surrounded at its top by a UHF/L-band dipole. Design of the elements is such as to minimize coupling between bands and additional in-line diplexing and filtering is included in the antenna base to achieve between 55 to 75 dB isolation (see over). Radiating elements are totally encased in high strength fiberglass tubing which provides insulation in the event of accidental contact with 10kV RMS (minimum) high voltage power lines. Rugged design ensures reliability in arctic, jungle or equatorial desert environments. The antenna is spring mounted for vehicular use and has a mounting base compatible with standard CECOM mounting brackets, having four 7/16 inch dia. holes on a 4.5 inch circle.

Spring mounted - can be tied down for stowage
Fits standard CECOM 4 hole mount
Robust weather-proof element detachment joint above spring
Designed to sustain 25 mph “Oak Beam” Test
100 Watts CW Power
Very high (55-75 dB) isolation between bands
Complies with MIL-STD-810 Environmental and MIL-S-901 shock
High Voltage protected
Omni-directional in azimuth - gain optimized near horizon

	20-50-10-3
Model #	20-50-10-3
Brand	Cooper Antennas

Frequency	30-88 MHz 225-450 1250-2000 MHz
Gain (at horizon on 4’x 4’ ground plane )	30-88 MHz between - 5dBi and -2.5dBi 225-400 MHz ≥ 0dBi 401-450 MHz ≥ 1dBi 1250-2000 MHz between +1dBi to +2dBi (see chart)
VSWR	≤ 3.1 VHF ≤ 3:1 UHF ≤ 2.5:1 L-Band
Impedance (nominal)	50 Ohms
Power	100 Watts CW
Polarization	Vertical
Isolation	VHF to UHF VHF to L Band UHF to L Band	30-88 MHz 225-450 MHz 30-88 MHz 1200-2000 MHz 225-450 MHz 1200-2000 MHz ≥ 55 dB	≥ 60 dB ≥ 65 dB ≥ 65 dB ≥ 55 dB ≥ 75 dB ≥ 55 dB
Antenna RF Connector	BNC Female (VHF) N Female (UHF) TNC Female (L-Band)