Photo 4a—The ZSAT II flight computer includes a Trimble GPS module and GPS antenna mounted on top of 9-V batteries. The IrDA transceiver is located just below the Sky label at the top of the board. This location lines up with a window that I cut in the payload bay. b—Here you can see the MaxStream 900-MHz RF module, the battery holder for GPS backup battery, and a terminal block for connecting the wireless camera