SOFTWARE DEFINED RADIO

 The designed printed circuit board is a doubled sided 4-layer stacked 433MHz Software Defined Radio module that takes in radio signals and converts into equivalent baseband analog signal using an in-built quadrature demodulator. The analog signals are digitized using ADCs present in the mounted microcontroller module which can be accessed via a host computer using the on-board USB interface.

It acts a satellite data receiver.

WORKING

The antenna is the receiving end for capturing the radio signal and then it is passed through a 433Mhz Sound Acoustic Filter, a passive component that allows only rf signal in the specified range to pass through to undergo further processing. The signal is then amplified using a Low Noise Amplifier that help increase the intensity. The amplified radio signal is converted to a differential format using a Balun and this signal is fed into the quadrature demodulator that demodulates and converts the message in the radio signal into high frequency differential Q and I channel baseband analog signals. The differential analog signal is then passed through a Low Pass Filter using a differential amplifier to order convert it to low frequency single channel Q and I analog signal. These analog signal is converted to its digital equivalent using in-built ADCs in the mounted microcontroller module. The digital signal can be accessed through a ESD-protected on-board USB interface .

Detailed Explanation is provided in the Design Document attached.