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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Uniden PRO 640XL owner manual Controls and Functions