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This beacon board is an elementary example of a transmitter. <br \>
Next, we have Downlink board. The Downlink signal contains telemetry data. Hence it has to communicate with the On-Board Computer to gather the data which needs to be transmitted. This data is received in packeted form which is passed from On-board microcontroller (downlink board microcontroller) to the transceiver CC1101 (Texas Instruments). It modulates the signal using [https://en.wikipedia.org/wiki/Frequency-shift_keying FSK modulation] on the 437.455 MHz frequency. This signal then passes through Power Amplifier which amplifies the signal, and it is radiated through the monopole antenna. <br \>
SImilarly, the Uplink board has the transceiver CC1101. The signal received by the uplink antenna is passed through LNA (Low noise amplifier) to increase the strength of the signal. Here LNA output will be input to CC1101 which will validate the authenticity of the signal after de-modulating it and then it will pass the data further down for processing. <br \> <br \>----If you are done reading this page, you can go back to [[Communications Subsystem]]
== References ==