0 erating.Procedure .

TO RECEIVE

1.Be sure that the power source, antenna and microphone are properly connected.

2.~urn the unit on by rotating the Volume control clockwise.

3.S~t the channel selector switch to the desired channel.

4.Set the Volume control to a comfortable listening level.

5.listen to the background noise from the speaker. Turn the Squelch control clockwise until the noise disappears (no signal should be present). leave the con- trol at this setting. The squelch is now properly set. The receiver will remain quiet until a signal is actually received. Do not advance the control too far, or some weaker signals will not be heard.

6.Ifthe transmission you are hearing has annoying high frequency distortion try activating the Hi Cut feature.

TO TRANSMIT

1.Be sure the operator has read and understands DOTAC rules and regulations prior to operating the transmitter.

2.Select the desired channel for transmission.

3.Ifthe channeOs clear, depress the push-to-talk switch on the side of the microphone and speak

CAUTION: The transceiver Voltage Standing Wave Ratio (VS.W.R.) measure- ment must be performed prior to the use of the transmitter. A "V.S.W.R."ratio in excess of 2: 1 may damage the transmitter. Please check your SWRreading fre- quently by pressing the SWRkey.

PREVENTIVE MAINTENANCE

At six to twelve month inteNals, the following system checks should be made:

1.Check the Standing Wave Ratio (V.S.W.R.)

2.Inspect all electrical connections

3.Inspect antenna coaxial cable for wear

4.Inspect all screws and other mounting hardware

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Uniden PRO 640XL owner manual Erating.Procedure, To Receive, To Transmit, Preventive Maintenance