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C. Exceptions: In ISB and locked-up SAM modes, the squelch is controlled only by the
signal present in the channel (or channels) selected by the channel selector switch (LSB,
BOTH, or US B). Signals in a deselected channel will not open the squelch. Squelch
threshold can still be adjusted.
4-23 NB (Noise Blanker) button: The noise blanker reduces interference from
unwanted pulse noise. This feature operates in all detection modes, providing a total of
ten blanker settings.
To enable the blanker, press the NB button. It will illuminate and the Edit Knob will be
assigned to the blanker's edit function. Also, the blanker will become activated and the
previous setting (0-9) will appear in the NB display area of the display:
1. Set Noise Blanker via the Edit Knob: Rotate the Edit Knob for the lowest setting
where significant reduction of the unwanted noise occurs. The new setting will appear in
the NB area of the display. The blanker may be toggled in or out with the NB button, and
the current setting will be retained until a new value is entered. Activating another edit
parameter button disengages the Edit Knob. To fully deactivate the blanker, press the NB
button for a '-' indication in the Aux Parameter window.
2. Set Noise Blanker via the Keypad: Enter the desired blanker setting (between 0 and
9) via the keypad. The receiver's main frequency display will blank and show your
entry. To activate your entry, press the NB button. The blanker level will transfer to the
Auxiliary Parameter display, become activated, and the main display will automatically
restore to the receiver's operating frequency.
4-24 OPT-1 (Option 1) Button: Reserved for future applications.
4-25 OPT-2 (Option-2) Button: Reserved for future applications.
4-26 MEMORY/SCAN Overview: Controls in the Memory/Scan group may be used to
store and recall frequently-used channels, and also to search selected channels or
frequency spans for activity.
1. Storing Frequencies: The receiver's Channel Memory stores up to 100 numbered
channels, retaining frequency, mode, and basic operating parameters for each. In
addition, an un-numbered Scratch-Pad memory is available for rapid storage and
retrieval of an alternate operating frequency. Frequencies may be entered into memory as
follows:
4-12
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