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SDR Demonstrator for Digital 2-slot TDMA Radio Systems



  • Direct Conversion Digital Radio Demonstrator
  • Provides a demonstration platform for:
     - Direct Conversion Receiver CMX994
     - TDMA Radio Processor CMX7161
     - TWELP Professional Radio Vocoder CMX7262
  • On-board ARM Host Processor:
    (Cortex M3 with internal flash and RAM)
  • 16-button (4 x 4) Keypad
  • 2 x 16-character LCD Display
  • Can function in the following modes:
     - Completely stand-alone
     - Controlled by scripts running via a PC
     - User-defined host controller interface
  • On-board Frac-N PLL and VCO for 444 MHz to 450 MHz Operation
  • 1W Power Amplifier
  • On-board Microphone
  • On-board Loudspeaker
  • Jack sockets for audio in/audio out
  • Powered by external 4.5V power supply or 3 x AA batteries
  • Designed to meet EN 300 113

The DE9943 is a compact demonstration/evaluation platform for 2-slot TDMA Digital Radio designs incorporating the CMX7161 TDMA Digital Radio Processor, the CMX7262 TWELP Professional Radio Vocoder and the CMX994 Direct Conversion Receiver.

The board can be used to demonstrate a complete RF transceiver and baseband function supporting a direct conversion receiver and VCO two-point modulation transmitter. The DE9943 features a built-in keyboard, display, microphone and loudspeaker and so can be used to demonstrate DMR peer-to-peer operation in a standalone configuration. The board has an ARM processor which handles initial board power up and loading of the Function ImagesTM for the CMX7161 and CMX7262. Once the system is powered up, the processor will handle basic radio functionality (channel selection etc) and baseband control, allowing demonstration of a simple voice call and data transfer.

The DE9943 provides a Fractional-N PLL and VCO plus associated circuits to provide local oscillator signals for the CMX994. The design also includes a 1W power amplifier, harmonic filter and Tx/Rx switch. The RF performance is designed to be compliant with EN 300 113 and all the circuits are provided with power-down capability to allow standby functionality.

DE9943 Image

Design Support Information

DE9943 - DE9943 configuration and test modes Three scripts to demonstrate operation of the DE9943 under GUI control. Note the DE9943 GUI must be used not the PE0003 GUI.
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