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Block Diagram The video link is a collection of off the shelf components and a custom controller board. The major subsystems include the following.  UHF
Receiver The payload computer utilizes a low power UHF transmitter
to send command and data information to other packages within the payload
train. The video link payload utilizes information from the payload
computer to display latitude/longitude, ground speed and heading, station
call sign, and flight time. The link utilizes a 1200 bps ASK
modulation link that is manchester encoded and verified with a 16-bit CRC.Controller
The controller board utilizes a Microchip PIC18F252 flash memory based
processor running at 3.6864MHz.Camera
Provides a video signal to the S-Band modulator and accepts command by an
RS-232 port from the controller board.S-Band
Modulator
The S-Band transmitter is a common, low cost Microwave module manufactured
by Comtech. It is available from a number of on-line vendors for less
than $50. It features an SMA output connector, video and stereo audio
inputs, and programmable frequency through an I2C interface.PA
The PA (Power Amplifier) is based on a
M/A-COM MA02303GJ RF
Power Amplifier for the 2.4 GHz ISM band.Li-Ion
Battery Pack Complete information on these cells is available in
the Power Sources
section.DC/DC
Converter Provides 12VDC to the video modulator, 5 VDC to the PA,
and 3.3 VDC to the controller.
Video Link Block
Diagram |
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