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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 CUTKEY- 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 - Thisswitch 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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