The SDST from General Dynamics Mission Systems is a space-qualified satellite transponder designed for deep space communication and high-reliability telemetry links. Supporting both X-band and Ka-band operations, it enables robust uplink and downlink communication for spacecraft operating in deep space and Earth-orbit missions. This transponder operates with an X-band uplink frequency range of 7.145–7.235 GHz and a downlink range of 8.400–8.500 GHz, along with a Ka-band downlink range of 31.800–32.300 GHz. It delivers a low noise figure of 2.1 dB and achieves a high sensitivity of –158 dBm, ensuring reliable signal reception under weak signal conditions. 

The system maintains a carrier delay variation of 0.5 ns, supporting precise timing and communication stability. Designed for compatibility with deep space infrastructure, the SDST supports communication with the NASA Deep Space Network and includes redundant I/O with cross-strapping for enhanced system reliability. It features a MIL-STD-1553B data interface for robust spacecraft communication and operates from a 22–36 VDC power supply. The transponder is engineered for radiation environments with single-event upset (SEU) tolerance and total ionizing dose (TID) capability of up to 100 krad, ensuring long-term operational stability in harsh space conditions. 

It is housed in a compact unit measuring 7.13 × 6.55 × 4.50 inches and has a mass of approximately 3.2 kg, supporting integration into deep space and high-performance satellite platforms. Reliable and high-performance, the SDST transponder is ideal for deep space missions, X-band and Ka-band telecommunications, scientific spacecraft and missions requiring secure and precise communication links with the NASA Deep Space Network.