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Hardware Shown below is the custom video link controller board. The board utilizes a Microchip PIC18F252 flash memory based processor. The processor decodes the bit stream from the UHF cross-payload receiver, sends commands to the camera controller via the RS-232 driver, programs the S-Band transmitter via the I2C interface, and controls the operation of the on-board power converters. The processor oscillator provides the clock signal for the UHF cross-payload receiver. The 12VDC required by the S-Band transmitter is generated by a switching boost regulator, followed by an LDO (Low Drop Out) linear regulator to improve ripple rejection. The 5VDC required by the PA is provided by a switching buck regulator that can be turned on and off remotely. The processor, UHF cross-payload receiver, and RS-232 driver all operate off an LDO linear regulator. Because the total power required for these devices is less than 20mA, a linear circuit was selected rather than adding another switching supply to the system.  Video Link Controller - Front. Rear side of board with hatch filled ground plane and SMA connector. The SMA connector is the cross payload receiver antenna input.  Video Link Controller - Bottom. Schematic / PCB Layout For best quality, print the schematic on a single 8½ x 11" sheet of paper in landscape mode using your favorite graphics application.
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