B&K Precision 2640 - Manual - Manual (Page 39)

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Marker
B&K Precision 2640 has Center Marker, Marker 1, Delta Marker (Marker1
and Marker2) and Squelch Marker. Each Marker Mode can define a state of
Marker ICON into the top-left Marker Mode ICON.
Marker Mode
ICON
Marker ICON
Center Marker
No ICON
Marker 1
You can settle Marker 1 in this
state.
Marker 2
You can settle Marker 2 in this
state.
Squelch Marker
Fix the volume when listening by
making a multiple Signal to audible
Frequency Bandwidth to use
FM/AM/SSB and then fix Basic
Signal of Squelch Run.