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3

17.

CB/WX/PA 

Switch:  Selects 

PA

(Public Address) 

WX

(Weather 

Radio) or 

CB

18.

S/RF/SWR

/

CAL:

Selects meter function. 

S/RF

- normal; 

SWR

and 

CAL

are for SWR measurements only.  See page 8

for calibration procedures.

19.

Multi-function Meter:

Measures 

SWR

RF

and 

S

signal strength. 

REAR VIEW

20.

POWER

:  Connects 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 transceiver.

To prevent acoustic feedback, separate the
microphone from the speaker when operating 
the 

PA

at high output levels.

When the external speaker is plugged in, the
internal speaker is off.

Do not use

PA

function unless an

external speaker is connected.

pc78ltw.qxd  2/24/99  8:24 AM  Page 3

Summary of Contents for PC78LTW

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

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

Page 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...

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

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