The WinRadio G305e/PD scanning multimode software defined receiver (SDR) has been selected for the signal conversion stage. This Australian made SDR is one of the first commercial off the shelf receivers available with a universal serial bus (USB) interface. www.winradio.com.au/home/g305e.htm
The usual SDR configuration for this application is lower single sideband, subsequent digital signal processing (DSP) stages can be selected to suit any number of requirements. The Professional Demodulator option was included to allow selectable intermediate frequencies (IF) bandwidths up to 15kHz in 1Hz steps.