Uniden Bearcat PC787 Owner's Manual page 7

Do not use the pA function unless an external speaker is connected.
4. NB+ANL/ANL/OFF switch: Activates the Noise Blanker (NB) and
Automatic Noise Limiter (ANL) features. NB reduces external
noise and ANL reduces background noise from the car engine
and other sources. OFF turns off both the NB and ANL features.
5. 9/19/NORM switch: Move the switch to select emergency
channel 9, channel 19, or standard CB channels.
All channels except Channel 9 may be used for normal communication.
The FCC reserves Channel 9 for emergencies involving the immediate
safety of individuals or protection of property. Use Channel 9 to render
assistance to a motorist.
6. HIGH/MED/LOW switch: Adjust LCD backlight and all
illuminations brightness.
7. RX/TX LED: Indicates whether the radio is transmitting (red) or
receiving (yellow-green).
8. Channel Indicator: Displays the channel currently in use.
9. 6-Pin Microphone Jack: Connects the radio to the detachable
microphone (included).
10. Channel Selector knob: Turn this knob to select CB or Weather
channels.
11. RF Gain inner knob: Turn the inner knob to reduce interference in
strong signal areas.
12. MIC Gain outer knob: Turn the outer knob to adjust the
microphone sensitivity.
13. CAL inner knob: Turn the inner knob to calibrate the meter for
Standing Wave Ratio (SWR) measurements.
14. TONE outer knob: Turn the outer knob to change the tone quality.
15. VOL inner knob: Turn the inner knob to turn the radio on and off
and to adjust the volume.
16. SQUELCH outer knob: Turn the outer knob to reduce background
noise when there is no incoming signal.
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