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With the standard G305 receiver, the FMW mode
button is disabled and the wide FM demodulation mode is not
available. This is because wide FM demodulation is not possible
to be provided as part of the G305 software-defined radio
system, within the constraints imposed by the processing power
of a standard personal computer.
However, wide-band FM demodulation capability
is available as a factory-installed option. This is in fact a
self-contained "hardware-defined" receiver which shares only the
main receiver's front-end and first mixer, but has an
independent wide-band analog processing circuit with a
conventional "hardwired" demodulator.
If the Wide FM Option is installed, the
FMW button becomes active. The demodulator spectrum display
shows real-time spectrum of the demodulated audio. In the
Professional Demodulator there is a user-definable audio filter,
displayed superimposed over the audio spectrum and graphically
adjustable.
The Wide-FM Option provides a
separate wide-FM demodulator. The wide-FM demodulation is
performed in hardware, using conventional hardware-based
demodulation techniques, in order to ease the requirement of PC
processing power which would otherwise be required for a signal
of this bandwidth. In other words, the Wide-FM Option
is an entirely separate receiver on its own right. |
