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When the original center frequency/span is inadvertently tuned to an alias
response of a signal whose frequency is not the center frequency, the checker
will attempt to suggest the signal’s frequency. The checker results at the desired
center frequency location (box formed by white solid and dashed lines) will show
no signal, and a large signal will appear in one of the zones, as shown in Figure 9.
Further, all zone boxes will be well above the orange threshold line.
Figure 9. Alias checker results when the
center frequency is originally tuned to an
alias product. The checker shows no sig-
nal at the desired frequency (white solid/
dashed box) and large zone boxes at the
zones containing the desired signal.