The capabilities of the SDST include: * X-band receiver/downconverter capable of carrier tracking at or below −156 dBm. * Command detector unit function. * Telemetry modulation function. * X- and Ka-band exciters. * Beacon mode operation. * Coherent and noncoherent operation choice. * X- and Ka-band ranging. * Differential one-way ranging (DOR) for both X-band and Ka-band. * Command and Data Handling (C&DH) communication via MIL-STD-1553. * Data interface via EIA-422 (also known as RS-422). * External ports for temperature sensors. * External port for an analog signal.