This design implements a one way audio link, based on the Texas Instruments CC1150 (transmit only),CC1101 (transmit/receive), and the MSP430F2232 microcontroller。 The system consists of a ‘transmitter’ card and a ‘receiver’ card, and operates in the 900 MHz band (868 – 928 MHz)。A power amplifier is included on the transmitter card, to increase the power output to +20 dBm while maintaining acceptable harmonic suppression。 The receiver card contains a Low Noise Amplifier to increase the receiver sensitivity。Reliable communications is maintained over a range in excess of 600 feet (180 meters) in ‘line of sight’ environments (non frequency diversity applications)。
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