Decoder Device for RBDS and RDS FM Tuner

The decoder project was created to support FM tuners from both USA using RBDS and Europe using RDS at 88-108MHz band.

The TDA7330 is the actual RDS/RBDS decoder that contains the PIC18F452 microcontroller along with the 4×20 LCD display or a smaller graphical LCD to display the data can be chosen since it is low power and best suited for portable applications. Larger LCD is best for fixed receivers. The LCD is being driven by the PIC18F452 microcontroller as it looks for valid data. It also incorporates the FM stereo tuner with MPX output and headphone amplifier and a simple RS232 interface to show all decoded data properly.

The characters that will be displayed on the first row will contain the Station Name, Quality, Program Identification, Traffic Program, and Announcement. The second row contains the Time and Date. Radio Text Line will be in third and fourth row. A stable arrow in quality indicator means the reception is good while the joystick gives the full control over the circuit in the digital tuning and volume control. A double stereo potentiometer can be replaced by dual 256-step 10k SPI digital potentiometer.

Rest of the project