The Model AR-20R is a portable, RF booster amplifier, Tactical Radio equipment employing legacy, proprietary and emerging waveforms. The amplifiers cover the frequency band of 225-450 MHz, 1250-1390 MHz, and 1750-1850 MHz with high speed auto switching T/R detection circuits and a low pass output filter to assure good harmonic suppression. The unit is designed for use with modern networking formats like ANW2, WNW and SRW. The amplifiers is designed for operating at 24 to 28 VDC, RF sensing, T/R switching, Automatic Level Control (ALC), protection against antenna mismatch and over-temperature. Protection against accidental polarity reversal is provided. The AR-20R also has an internal LNA that can be switched on or off by the front panel switch. The amplifiers are comprised of rugged 2-piece aluminum case. Optional interface coaxial cables and DC battery cables are available.