The NuPower Xtender TM SCISR-20 Tri-Band Bidirectional Amplifier is a unique and versatile amplifier designed to support secure CDL ISR (SCISR) software-defined radio communications but can be used in any L-, S-, and/or C-band application. The SCISR-20 simultaneously provides over 20 watts of RF transmit power, over 15 dB of receive gain, and features auto-sense T/R switching.