Uniden Bearcat PC78LTX User manual

Owner’s Manual
Printed in Vietnam
U01UT407AZZ (0)
®
PC78LTX

CUSTOMER CARE
At Uniden®, we care about you!
If you need assistance, please do NOT return this product to your place of
purchase.
Quickly find answers to your questions by:
1. Reading your owner’s manual.
2. Visiting our customer support website at www.uniden.com.
Images in this manual may dier slightly from your actual product.
Save your receipt/proof of purchase for warranty.
© 2016. All rights allowed by law are hereby reserved.
Uniden is a registered trademark of Uniden America Corporation.
Bearcat is a registered trademark of Uniden America Corporation.
Features, specifications, and availability of optional accessories are all subject to change without notice.

CONTENTS
DESCRIPTION.............................................................................. 5
EMERGENCY OPERATIONS .......................................................................... 5
WHAT’S IN THE BOX...................................................................................... 5
FRONT VIEW .................................................................................................. 6
REAR VIEW..................................................................................................... 7
INSTALLATION............................................................................ 7
MOBILE INSTALLATION................................................................................ 7
Mobile Antenna........................................................................................... 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 MAINTENANCE .................................................. 12
MAINTENANCE ......................................................................... 12
TROUBLESHOOTING ................................................................ 13
SPECIFICATIONS....................................................................... 13
RADIO CODE DEFINITIONS ..................................................... 15
10-CODES..................................................................................................... 15
SAFETY NOTICE ........................................................................ 16
ONE-YEAR EXTENDED WARRANTY ........................................ 17

4

5
DESCRIPTION
Your Uniden PC78LTX is a high-quality communications device designed
for use in the Citizens Band Radio Service. It will operate on any of the 40
AM frequencies authorized by the Federal Communications Commission
(FCC).
The Citizens Band Radio Service is under the jurisdiction of the Federal
Communications Commission (FCC). Any adjustments or alterations
which would alter the performance of the transceiver’s original FCC type
acceptance, or which would change the frequency determining method,
are strictly prohibited. Replacement or substitution of crystal, transistors,
ICs, regulator diodes, or any other part of a unique nature, with parts
other than those recommend by Uniden, may cause violations of the
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 to Channel 9.
2. Press the microphone PTT switch and speak clearly.
3. If there is no response, select an active channel and ask that party
to relay your emergency broadcast on Channel 9.
All channels 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 9 may also be used to render assistance to others.
This is an FCC rule and applies to all operators of CB radios.
WHAT’S IN THE BOX
Carefully unpack your PC78LTX and check the contents against this list:
PC78LTX CB 2-way mobile radio
Microphone
Mounting Bracket Kit
DC Power Cord
Owner’s Manual
Part 95 Subpart D (FCC Rules)

6
If any items are missing or damaged, visit our website at www.uniden.com
for further information.
Never use damaged products!
FRONT VIEW
Item Denition
1Microphone jack
2ON OFF - VOLUME: Turns radio on or o; adjusts speaker volume.
3SQUELCH: Reduces background noise when there is no incoming
signal.
4MIC GAIN knob: Adjusts microphone sensitivity
5RF GAIN knob: Improves reception in strong signal areas.
6SWR CAL: Calibrates the meter for Standing Wave Ratio (SWR)
measurements. (See page 11.)
7Channel knob: Selects channel.
8Channel Display: Displays current channel selection
9ANT LED: Indicates a high SWR condition in antenna system.
Check antenna, cable, and connections.
10 RX/TX LED: Red-transmitting; green-receiving.
11 HI CUT/OFF switch: When turned on, cuts high audio frequencies.
12 CH9/OFF switch: Instantly tunes to emergency CB Channel 9. Turn
o to resume normal channel operations.
13 BRT/DIM switch: Adjusts the LED brightness
621 5 7
16 9
11
12
13
14
15
17 8
10
43

7
Item Denition
14 CB/PA: Selects CB (Citizen’s Band) or PA (Public Address).
Do not use PA function unless an external speaker is connected.
15 NB/ANL/ANL/OFF switch: Reduces external noise and interfer-
ence from vehicle ignition systems.
16 S/RF/SWR/ CAL switch: Selects meter function. S/RF- normal;
SWR and CAL are for SWR measurements only. See page 11 for
calibration procedures.
17 Multi-function meter: Measures SWR, RF and S signal strength.
REAR VIEW
9
8
Item Denition
18 Antenna socket: Connects antenna cable to transceiver.
19 PA SP. jack: Connects external 8-ohm, 4-watt speaker.
To prevent acoustic feedback, separate the microphone from the
speaker when operating the PA at high output levels.
20 EXT. SP. jack: Connects optional 8-ohm 4-watt speaker to remotely
monitor the receiver.
When the external speaker is plugged in, the internal speaker is o.
21 POWER connector: Connects DC power to transceiver

8
INSTALLATION
MOBILE INSTALLATION
Plan the location of the transceiver and microphone bracket before
beginning installation.
1. Select a location that is convenient for operating the radio, but
does not interfere with the driver or passenger.
2. Install bracket with self-tapping screws provided.
3. Connect power cords (see page 9).
4. Attach the microphone bracket to the side of the radio.
5. Attach radio to bracket.
Mobile Antenna
WARNING! The antenna used for this radio must be installed at least 16.92
inches (43 cm) away from all persons. The antenna must not be collocated
or used with any other antenna or transmitter.
CAUTION: Never operate your radio with no antenna or with a 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 is very important. To achieve the maximum
transmission distance, Uniden strongly recommends that you install only
a high quality antenna. You have just purchased a superior transceiver -
don’t diminish its performance 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 qualified to help you select the proper antenna for
your requirements. A whip style antenna may be used for automobile
installation.
A short ‘loaded’ whip antenna is easier to install on an automobile, but its
efficiency is less than that of a full quarter-wave whip antenna.

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.

10
USING YOUR PC78LTX
TURN PC78LTX ON/OFF
Turn the VOLUME knob clockwise until the unit turns on and the display
backlight turns on.
Turn the VOLUME knob counter-clockwise to turn the unit off.
CB MODE
Be sure that the power source, antenna, and microphone are properly
connected before proceeding.
1. Turn the unit on. Set the volume to a comfortable level.
2. Set switch to CB.
3. Turn the CH knob to select a CB channel.
4. Set noise limitations switch to NB/ANL.
5. Adjust squelch.
• Adjust SQUELCH knob 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 SQUELCH knob back clockwise until the hiss
stops. Only clearer signals get through.
Set SQUELCH only when the radio is not receiving a strong signal.
6. Press and hold PTT and check the multifunction meter. It will
show the RF output power.
7. Adjust RF GAIN knob set RF Gain sensitivity. Normally, the knob is
turned clockwise to maximum.
8. Set the brightness (BRT or DIM).
9. Set meter switch to S/RF.
PA MODE
Using the PA mode requires an optional speaker.
1. Switch to PA.
2. Press and hold PTT to speak.