background image

9

Connecting the Power Cords

Uniden recommends connecting the power lead to the Ignition Switch 

Accessory Terminal. This way, the transceiver is automatically turned off 

when the ignition switch is turned off. 

As an alternative, the power cord may be connected to an available 

terminal on the fuse block or to a point in the wiring harness. However, 

take care to prevent a short circuit. If in doubt, contact your vehicle 

dealer for information. 

This transceiver may be installed and used in any 12-volt DC negative 

ground system vehicle.

Ground Information

Most newer U.S. and foreign made cars and small trucks use a negative 

ground system. Some older cars, and some new large trucks, use a 

positive ground system.

With a negative ground system, the negative (-) battery terminal is 

usually connected to the vehicle motor block. If you cannot determine 

the polarity system of your vehicle, contact your vehicle dealer for 

information.

Negative Ground System

For negative ground systems, connect the red DC power cord from the 

transceiver to the positive (+) battery  

terminal or other convenient point.

Then connect the black power cord 

to the vehicle chassis or negative (-) 

battery terminal.

Summary of Contents for Bearcat PC78LTX

Page 1: ...Owner s Manual Printed in Vietnam U01UT407AZZ 0 PC78LTX...

Page 2: ...t website at www uniden com Images in this manual may differ slightly from your actual product Save your receipt proof of purchase for warranty 2016 All rights allowed by law are hereby reserved Unide...

Page 3: ...8 Connecting the Power Cords 8 Ground Information 9 USING YOUR PC78LTX 10 TURN PC78LTX ON OFF 10 CB MODE 10 PA MODE 10 HI CUT OFF 11 TO TRANSMIT RECEIVE 11 MULTI FUNCTION METER 11 PREVENTIVE MAINTENAN...

Page 4: ...4...

Page 5: ...he technical regulations in Part 95 of the FCC Rules or in violation of type acceptance requirements in Part 2 of the rules EMERGENCY OPERATIONS 1 Set the switch to CH9 or turn Channel Selector knob t...

Page 6: ...trong signal areas 6 SWR CAL Calibrates the meter for Standing Wave Ratio SWR measurements See page 11 7 Channel knob Selects channel 8 Channel Display Displays current channel selection 9 ANT LED Ind...

Page 7: ...r calibration procedures 17 Multi function meter Measures SWR RF and S signal strength REAR VIEW 9 8 Item Definition 18 Antenna socket Connects antenna cable to transceiver 19 PA SP jack Connects exte...

Page 8: ...damaged antenna cable This can damage the radio You must purchase an antenna to operate this radio Because the maximum power output of the transmitter is limited by the FCC the quality of your antenna...

Page 9: ...in any 12 volt DC negative ground system vehicle Ground Information Most newer U S and foreign made cars and small trucks use a negative ground system Some older cars and some new large trucks use a p...

Page 10: ...b fully clockwise so only strong signals can get through Adjust SQUELCH knob fully counter clockwise until you hear a hiss Everything gets through noise weak signals and strong signals Slowly adjust S...

Page 11: ...damage the transmitter Be sure to read and understand Part 95 FCC Rules and Regulations before operating your transmitter 1 Select a channel 2 Adjust MIC GAIN 3 When the channel is clear press the mi...

Page 12: ...ter swings to indicate signal strength i e S 3 S 5 S 7 PREVENTIVE MAINTENANCE Every six months 1 Check the Standing Wave Ratio SWR See page 11 2 Be sure all electrical connections are tight 3 Inspect...

Page 13: ...ain No Transmission Set CB PA switch to CB Check microphone connection Adjust MIC Gain Low Transmission Be sure antenna SWR is normal Adjust MIC Gain Calibration does not move the meter needle to the...

Page 14: ...B S N N 1 V for 10 dB S N N Selectivity 6 dB 7 kHz 60 dB 10 kHz Image Rejection 80 dB typical Adjacent CH Rejection 60 dB typical IF Frequencies Double Conversion 1st 10 695 MHz 2nd 455 kHz Automatic...

Page 15: ...10 3 Stop transmitting 10 36 Correct time is 10 4 OK message received 10 37 Wrecker needed at 10 5 Relay message 10 38 Ambulance needed at 10 6 Busy stand by 10 39 Your message is delivered 10 7 Out...

Page 16: ...my frequency on this channel 10 30 Does not conform to FCC rules 10 94 Please give me a long count 10 32 I will give you a radio check 10 99 Mission completed all units secure 10 33 EMERGENCY TRAFFIC...

Page 17: ...Operation is subject to the following two conditions 1 this device may not cause interference and 2 this device must accept any interference including interference that may cause undesired operation...

Page 18: ...d in any conjunction with equipment or parts or as part of any system not manufactured by Uniden or F installed or programmed by anyone other than as detailed by the owner s manual for this product ST...

Page 19: ...PROCEDURE FOR OBTAINING PERFORMANCE OF WARRANTY If after following the instructions in the owner s manual you are certain that the Product is defective pack the Product carefully preferably in its ori...

Page 20: ......

Reviews: