Welcome to Communication page
presented by Chikara Ohishi
- System Diagram
- Data Downlink System
- Tx-TNC:PIC16F877
- Receives GPS and telemetry data from OBC.
- Encodes the data with AX.25 protocol.
- Sends encoded data to FSK modulator.
- Data size:30Bytes
- Clock:4MHz
- Program Memory:8kwords
- Data Memory(RAM):368bytes
- Data Memory(EEPROM):256bytes
- Power consumption:2mA@5V,4MHz
- FSK Modulator:MX614
- Receive data from Tx-TNC.
- Sends FSK Modulated wave to transmitter.
- Bit Rate:1200Baud
- Mark Frequency:1200Hz
- Space Frequency:2200Hz
- Clock:3.58MHz
- Power consumption:1.7mA
- This device is also used as FSK Demodulator in data uplink system
- FM Transmitter:VX-1
- Transmits downlink data to ground station.
- Frequency:435MHz(TBD)
- Band Width:16kHz
- Output Power:500mW@3.6V
- Power consumption:1.2W@3.6V
- Operation voltage:3.2 to 7V
- Antenna:SRH805
- Data Uplink System
- Rx-TNC:PIC614C622
- Receives AX.25 coded data from FSK Demodulator
- Decodes it and sends data to OBC
- Data size:20Bytes
- Clock:10MHz
- Program Memory:2kwords
- Data Memory(RAM):128bytes
- Power consumption:2mA@5V,4MHz
- FSK Modulator:MX614
- Receives FSK Modulated wave from Receiver.
- Sends demodulated data to Rx-TNC.
- FM Receiver:VX-1
- Receives Uplink data from ground station.
- Frequency:145MHz(TBD)
- Receive sensitivity:12dB
- Power comsumption:16mA
- Antenna:SRH805
- Program Flow Chart
- Communication Board
ARLISS
2001
Communication