User Manual

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The LSB and USB demodulators have basically the same topology:
USB Demodulator Structure
ISB can be thought of as a combination of LSB and USB, where each of the
sound card channels is used for one of the independent side bands.
The CW received signals are first down-converted to zero Hz, and then,
after additional channel filtering, up-converted to a convenient audio
frequency. This frequency (a digital BFO) is user-adjustable, by changing
the value of the CW tone frequency parameter in the demodulator set-up.
CW Demodulator Structure
Did you know?
The impressive sensitivity of the G303 receiver and the continuous IF
bandwidth adjustment facility make it possible to precisely match the
bandwidth of the receiver to that of the received signal and extract even the
weakest CW signals from background noise.