Uniden PRO 640XL User Manual

Page 3

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1. MIC GAIN - Adjusts the modulation of the mic for crisp, dear transmission.

ANL/NB KEY — You can select Noise Blankerand Automatic Noise Limi

ter orall filters OFF. The ANL/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.

INSTANT CH 9 and 19 — Press these keys to instantly select either channel.

Press again to return to normal 40 channel operation,

5. TXand RX INDICATORS — An LED lights to indicate when the radio is trans
mitting or receiving.

MICROPHONE - TTie operational mode ol the CB is controlled by the push-to-tatk switch on

the mic. Press the switch to activate the transmitter and disable the receiver. Release the switch
to en^le the receiver and disable the transmitter. When transmitting, hold the mic about 2 inches
from your mouth and speak dearly in a normal voice. The mic induded with the PRO 640XL is

a detachsüble, low impedance, dynamic type.

S/RF/SWR METER — This LED merer shows the relative strength of the re

ceived signal or the RF output and the Standing Wave Ratio of your antenna,

8. CHANNEL INDICATOR - Displays the channel currently in use.

9. CHANNEL SELECTOR - This switch selects the desired channel tor transmission and

reception. All channels, except channel 9, may be used for communications-between stations

operating under different license. Channel 9 has been reserved by №e DOTAC for emergency
communications involving the immediate safely of individuals or the immediate protection of

property. Channel 9 also may be used to render assistance to a motorist. This is a DOTAC rule

and ap^ies to all operators of CB radios.

10. CLARIFIER — Used to fine tune the receive frequency in USB/LSB modes.

11. RFGAIN — Press this control when strong signa Is are present to improve sig

nal reception sensitivity,

12.

SQUELCH - The Squelch control is used to eliminate background noise dur

ing the absence of a transmission. Turn the control fully counterclockwise, then

slowly rotate it back, clockwise until all noise disappears. At this setting any trans

mission must be slightly stronger than the background noise to 'Break Squelch" 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"