BIRD SignalHawk SH-36S-RM-ASL, Operation Manual, Page: 110 / 195

PC/Rack Mount SignalHawk with ASL
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Channel Spacing
For the sake of data resolution, this is the channel center to
channel center spacing in the band of interest. In some parts of
the spectrum the channel to channel spacing changes. In these
cases, separate spans will be required if locating the individual
channel centers in the recorded data is desired.
NOTE
The SignalHawk ASL is designed to provide enough resolution
to view every channel in a span. This requires a minimum of
three data points per channel. The SignalHawk has 705 data
points within each sweep therefore, a span that contains more
than 235 channels (as defined by channel spacing) will
automatically be broken into multiple sweeps (705 points /3
points per channel minimum).