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1. MIC GAIN - Adjusts the modulation of the mic for crisp, clear transmission.
2. ANL/NB KEY - Youcan select Noise Blanker and Automatic Noise Limi-
ter or allfilters OFF. TheANL/NB helps to reduce harsh background noise caused
by a variety of interference sources.
3. DIM KEY- The dimmer adjusts the front panel lights for optimum viewing.
4. INSTANT CH9 and 19 - Press these keysto instantly select either channel.
Press again to return to normal 40 channel operation.
5. TXand RXINDICATORS- An LEDlights to indicate when the radio istrans-
mitting or receiving.
6. MICROPHONE -The operational mode of the CB is controlled by the push-to-talk switch on
the mic. Press the switch to activate the transmitter and disable the receiver. Release the switch
to enable the receiver and disable the transmitter. When transmitting, hold the mic about 2 inches
from your mouth and speak clearly in a normal voice. The mic included with the PRO 640XL is
a detachable, Iow impedance, dynamic type.
7. S/RF/SWR METER- This LEDmeter shows the relative strength of the re-
ceived signal or the RFoutput and the Standing Wave Ratio of your antenna.
8. CHANNEL INDICATOR- Displays the channel currently in use.
9. CHANNELSELECTOR-This switch selects the desired channel for transmission and
reception. Allchannels, except channel 9, may be used for communications.between stations
operating under different license. Channel 9 has been reserved by the DOTAC for emergency
communications involving the immediate safety of individuals or the immediate protection of
property. Channel 9 also may be used to render assistance to a motorist. This is a DOTACrule
and applies to all operators of CB radios.
10. CLARIFIER- Used to fine tune the receive frequency in USB/LSBmodes.
11. RF GAIN - Press this control when strong signals are present to improvesig-
nal reception sensitivity.
12. SQUELCH- The Squelch control isused to eliminate background noise dur-
ing the absence of a transmission. Turn the control fullycounterclockwise, then
slowly rotate it back, clockwise until allnoise disappears. At this setting any trans-
mission must be slightlystronger than the background noise to "BreakSquelch" or
to be heard. Further clockwise rotation will increase the threshold at which a sig-
nal will be heard. You can select any level to "Break Squelch"
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