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Concepts
Resolving Closely Spaced Signals
To view the smaller signal, select a resolution bandwidth such that k is less than a
(see Figure 15-1). The separation between the two signals (a) must be greater than
half the filter width of the larger signal (k), measured at the amplitude level of the
smaller signal.
The digital filters in the analyzer have filter widths about one-third as wide as typical
analog RBW filters. This enables you to resolve close signals with a wider RBW (for
a faster sweep time).
Figure 15-1 RBW Requirements for Resolving Small Signals
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