The left part of the Setup window is similar to the Standard Demodulator. The right one contains some surprises: The demodulator parameters (such as the digital filter length) can be adjusted by the user. There are separate "tabs" for independent setting of each of the eleven demodulation modes.
Clicking on the View Demodulator Structure button discloses an interactive diagram of the demodulator structure:
At the top there is a block diagram showing the structure of the currently selected demodulator (each modulation mode has its own demodulator). Below, there are also two spectrum analyzers. Left clicking on any of the color points inside the block diagram will connect the left spectrum analyzer to the associated point (the color of the point will change to red). Right clicking will connect the right spectrum analyzer (the point color will turn blue).
At bottom left, there is a Vector Voltmeter showing amplitude and phase differences between the two selected points, at the cursor frequency.
There are also THD (total harmonic distortion) and SINAD (signal-plus-noise-plus-distortion to noise-plus-distortion) meters, to complement this unique instrument.
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G303 demodulators are DSP software plug-ins which fit into the G303 control panel. All the last IF (intermediate frequency stage) and the demodulation stage functions are performed in software. Having been freed from hardware constraints, this brings about unprecedented level of flexibility and performance to the receiver.
