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).

http://www-s.ti.com/sc/techlit/swra237

Download associated code files:  http://www.ti.com/litv/zip/swra237b