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5

CONNECTING THE POWER CORDS 

We recommend 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. 

Or, the power cord may be connected to an available terminal on the 
fuse block, or, to a point in the wiring harness. However, caution must 
be taken to prevent a short circuit. If in doubt, contact your vehicle dealer
for information.

GROUND INFORMATION

Note: 

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

or positive ground system vehicle.

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

If you have a negative ground system,
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.

Positive Ground System

If you have a positive ground system,
connect the 

black

DC power cord from the

transceiver to the negative (-) battery
terminal or other convenient point. Then,
connect the 

red

power cord to the vehicle

chassis or the positive (+) battery terminal.

This transceiver may be installed and used in any 12-volt 
DC negative or positive ground system vehicle.

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Содержание PC78LTW

Страница 1: ...COVER pc78ltw qxd 2 24 99 8 24 AM Page 1...

Страница 2: ...Your Transceiver 10 Troubleshooting 10 Radio Code Definitions 11 Specifications 12 Two Year Extended Warranty 13 Carefully unpack your PC78LTW and check the contents against this list n PC78LTW CB 2...

Страница 3: ...nnels except Channel 9 may be used for normal communication Channel 9 is reserved by the FCC for emergency communication involving the immediate safety of individuals or protection of property Channel...

Страница 4: ...9 Channel Knob Selects channel 10 Channel Display Displays current channel selection 11 RX TX Indicator Red transmitting green receiving 12 ANT Indicates a high SWR condition in antenna system Check a...

Страница 5: ...onnects DC power to transceiver 21 EXT SP Connects optional 8 ohm 4 watt speaker to remotely monitor receiver 22 PA SP Connects external 8 ohm 4 watt speaker 23 ANT Connects antenna cable to transceiv...

Страница 6: ...rformance by installing an inferior antenna Only a properly matched antenna system will allow maximum power transfer from the 50 ohm transmission line to the radiating element Your Uniden dealer is qu...

Страница 7: ...ositive 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 yo...

Страница 8: ...off and perform the following steps 4a Turn SQUELCH fully clockwise so only strong signals can get through 4b Turn SQUELCH fully counter clockwise until you hear a hiss Everything gets through noise...

Страница 9: ...he event of severe weather To configure your CB radio to receive weather alerts while using your CB radio 1 Set the switch to WX 2 Turn the Weather Channel knob to the channel with best reception Left...

Страница 10: ...ile pressing the microphone PTT switch A reading below 2 is acceptable Higher readings indicate a problem in the antenna system Problems may be caused by humidity vibration or corrosion Check both end...

Страница 11: ...n shielding 4 Be sure all screws and mounting hardware are tight The PC78LTW is designed to give you years of trouble free service There are no user serviceable parts inside Except for the fuse in the...

Страница 12: ...to MAX If you do not get satisfactory results after performing the above checks call the Uniden Customer Service Center at 1 800 297 1023 8 00 a m to 5 00 p m CST Monday through Friday Technical infor...

Страница 13: ...ify your station 10 29 Time is up for contact 10 30 Does not conform to FCC rules 10 32 I will give you a radio check 10 33 EMERGENCY TRAFFIC 10 34 Trouble at this station Code Meaning 10 35 Confident...

Страница 14: ...t Impedance 50 ohm unbalanced Receiver Sensitivity Less than 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 Do...

Страница 15: ...r refurbished unit THE LIMITED WARRANTY SET FORTH ABOVE IS THE SOLE AND ENTIRE WARRANTY PERTAINING TO THE PRODUCT AND IS IN LIEU OF AND EXCLUDES ALL OTHER WARRANTIES OF ANY NATURE WHATSOEVER WHETHER E...

Страница 16: ...back cover pc78ltw qxd 2 24 99 8 24 AM Page 14...

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