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B. Set Notch Filter Frequency via the Keypad:
Enter the desired filter frequency (between 0 and 2000 Hz) via the keypad, followed by
the sign: '+' for USB, and '-' for LSB. The main frequency display will show your entry.
Press the Notch button to activate the entry and transfer the notch frequency to the
Auxiliary Parameters display window. Upon activation, the main display will restore to
the receiver's operating frequency. Note that you must enter the sign (+ or -) after
entering the numbers and before pressing the Notch button. If you enter the sign first, the
receiver will interpret your entry as a step-tuning command and change frequency.
C. Exceptions: The notch function is not available with Fast Filters or wide BW
settings, and its LED will not illuminate in unavailable modes.
4-22 SQL (Squelch) button: The Squelch function is used to eliminate unwanted
background noise when no incoming signal is present. This feature operates in all
detection modes, and mutes receiver audio when in the "closed" state. Squelch threshold
(the strength a signal must have to open the squelch) is tied to the receiver's AGC system
and is continuously adjustable from -140 dBm to +10 dBm.
To enable the Squelch, press the SQL button. It will illuminate and the Edit Knob will be
assigned to the squelch control function. Also, the squelch circuit will activate and the
previous threshold setting (in dBm) will appear in the SQL display area of the display. If
the squelch is closed, the setting is bracketed by arrows (example: >-90<). If it is open,
the arrows are not displayed:
A. Set Squelch Threshold via the Edit Knob: Rotate the Edit Knob for a setting where
undesired background noise is cut off (the arrows will appear). Once set, the squelch
may be toggled on and off manually with the SQL button-the current threshold setting
will be retained until a new value is entered. Activating another edit parameter button
disengages the Edit Knob. To fully deactivate the squelch function, press the SQL button
for OFF, as indicated in the Aux Parameter window.
B. Set Squelch Threshold via the Keypad: Enter the desired threshold setting
numerically (between -140 and + 10 dBm) via the keypad. The entry will appear in the
main frequency display. To activate your entry, press the SQL button. It will illuminate
and the new threshold will transfer to the Aux Parameters display. The main display will
automatically restore to the receiver's operating frequency. Note that you must enter the
sign (+ or -) after entering the numbers and before pressing the SQL button. If you enter
the sign first, the receiver will interpret your entry as a step-tuning command and change
frequency.
4-11
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