Uniden PRO 640XL owner manual Controls and Functions

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Controls and Functions '"

13.VOLUME CONTROL - Rotate clockwise to turn radio on and to increase volume.

14.SWR KEY - Press to read the Standing Wave Ratio of your antenna. The SWRLEDwill light when the SWRkey is pressed.

15.HI CUT KEY - Press to reduce the high frequency response of the receiver. This key can be used to help eliminate the hiss and pop of weak signal reception.

. 16. PA KEY- Press this switch to the PublicAddress mode when an external PA speaker is connected. When the PA mode is selected, the CB radio will be dis- abled. Adjust the PA output level by rotating the mic gain control.

17.AM/USB/LSB Switch - This switch selects the operating mode of either Amplitude Modulation, Upper Sideband, or Lower Sideband.

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Pro 640XL Front Panel

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Contents Uni en@ Connecting the Power Cords WelcomePage Controls and Functions Pro 640XL Rear Panel Mobile Installation Mobile AntennaNegative Ground System Positive Ground SystemErating.Procedure Preventive MaintenanceTo Receive To TransmitMemo Trou bleshooti ng Servicing Your CBSpecifications Memo Warranty