XW 2A or CAS 3A (Chinese Amateur Radio satellite 3A) is a Chinese micro-satellite for atmospheric physics experiments and amateur radio missions.
The satellite features a 398 mm × 398 mm × 398 mm cubic body with body mounted solar cells and a mass of approximately 25 kg mass. It features a three-axis stabilization system.
The amateur communications payload consists of U/V 20 kHz wide transponders with 145 MHz CW beacon and 19k2 GMSK AX25 telemetry downlinks.
Two small daughter satellites XW-2E and XW-2F will fly piggyback on top of the satellite.
XW-2A was launched in a cluster of 20 satellites on the maiden flight of the CZ-6 rocket.
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