User Manual

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Spectrum Scope
In addition to the narrow-band real-time spectrum scope, which is located
inside the demodulator panel, the G303 receiver also has a wide-band
spectrum scope which operates by fast tuning the receiver across the user-
specified frequency range.
Click on the yellow triangle button on the left of the Power switch and the
Spectrum Scope display will slide out at the bottom:
To set up spectrum “sweeping”, enter the Start and End frequencies, to
specify the start and end of the sweeping range, respectively. Next specify
the frequency Step.
Spectrum Scope
The sweeping is controlled using a set of buttons similar to a tape recorder:
The Start button (with a triangle) starts sweeping. The Stop button (with a
square), stops sweeping, while the Pause button pauses it. The button with
a red round arrow selects continuous sweeping, which means that the
sweep will continue from the start frequency when the end frequency is
reached, and continue in this loop until manually stopped.
The Min, Man and Diff buttons enable the display of minimum, maximum
and differential values when continuous sweeping is selected. (A scale for
the differential trace will be displayed on the right-hand side whenever the
Diff button is pressed.) The differential trace is very useful when examining
long-term activity on a given band. The receiver can be left unattended in
the continuous sweeping mode, and any activity on the band will be clearly
visible on the differential trace.