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Uniden PC68LTX 40-Channel CB Radio Owner Manual

Uniden PC68LTX 40-Channel CB Radio FEATURE

Uniden logo

Uniden PC68LTX 40-Channel CB Radio

Uniden PC68LTX 40-Channel CB Radio PRODUCT

About Uniden 
Uniden America Corporation, the North American subsidiary of Japan-based Uniden Corporation, manufactures and markets wireless consumer electronic products including home security and video security systems, Bearcat® scanners, FRS/GMRS radios, marine radios, radar detectors, dash cams, and other wireless personal communications products. Based in Irving, Texas, Uniden sells its products through retailers and distributors throughout North, Central, and South America.


Your Uniden PC68LTX represents the highest 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 that would alter the performance of the transceiver’s original FCC-type acceptance, or that 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 recommended by Uniden, may cause violations of the technical regulations in Part 95 of the FCC Rules or violation of type acceptance requirements in Part 2 of the rules.


  1. Set the switch to CH9 or turn the Channel Selector knob to Channel 9.
  2. Press the PTT switch on the microphone 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 communications involving the immediate safety of individuals or the protection of property. Channel 9 may also be used to help a motorist. This is an FCC rule and applies to all operators of CB radios.


Carefully unpack your PC68LTX and check the contents against this list:

  • PC68LTX CB 2-way mobile radio
  • Microphone
  • Mounting Bracket Kit
  • DC Power Cord
  • Reference Guide
  • Part 95 Subpart D (FCC Rules)

If any items are missing or damaged, visit our website at www.uniden.com for further information. Never use damaged products!

FRONT VIEWUniden PC68LTX 40-Channel CB Radio Owner Manual-fig 1
Uniden PC68LTX 40-Channel CB Radio Owner Manual-fig 2

REARVIEW                                               Uniden PC68LTX 40-Channel CB Radio Owner Manual-fig 3



  1. Select a location that is convenient for operating the radio but does not interfere with the driver or passenger.
  2. Install the bracket with self-tapping screws provided.
  3. Connect power cords (see page 8).
  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.

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, caution must be taken to prevent a short circuit. If in doubt, contact your vehicle dealer for information.

Ground Information

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

Negative Ground System
With a negative ground system, the negative (-) battery terminal is usually connected to the vehicle motor block.  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.Uniden PC68LTX 40-Channel CB Radio Owner Manual-fig 4



  • Turn the VOLUME knob clockwise until the unit turns on and the display backlight turns on.
  • Turn the VOLUME knob counterclockwise to turn the unit off.


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 the switch to CB.
  3. Turn the CH knob to select a CB channel.
  4. Set noise limitations and switch to NB/ANL.
  5. Adjust squelch.
    • Turn the SQUELCH knob fully clockwise so only strong signals can get through.
    • Turn the SQUELCH knob fully counterclockwise until you hear a hiss. Everything gets through – noise, weak signals, and strong signals
    • Turn the SQUELCH knob clockwise until the hiss stops. Only clearer signals get through.

Set SQUELCH only when the radio is not receiving a strong signal.

  1. Press and hold PTT and check the multifunction meter. It will show the RF output power.
  2. Turn the RF GAIN knob to set RF gain sensitivity. Normally, the knob is turned clockwise to the maximum.
  3. Turn the MIC GAIN knob to adjust microphone sensitivity for transmission. Normally, the knob is turned clockwise to the maximum.
  4. Set the brightness (BRT or DIM).


Using the PA mode requires an optional speaker.

  1. Switch to PA.
  2. Press and hold PTT to speak.
  3. Release when finished.

To prevent acoustic feedback, separate the microphone from the speaker when operating the PA at high output levels. If you are in PA mode but not pressing PTT, the radio receives CB transmissions and transmits them through the PA speaker.  You cannot respond to the transmission.


  • The Hi-Cut function reduces high frequencies. Switch to HI CUT to turn off higher frequencies.


Perform a voltage Standing Wave Ratio (SWR) measurement before using the transmitter. An SWR ratio over 2:1 may 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 microphone PTT and speak.
  4. Release PTT when you are finished speaking to listen for the response.


Every six months:

  • Check the Standing Wave Ratio (SWR).
  • Be sure all electrical connections are tight.
  • Inspect antenna coaxial cable for wear or breaks in shielding.
  • Be sure all screws and mounting hardware are tight.

The PC68LTX is designed to give you years of trouble-free service. There are no user-serviceable parts inside. Except for the fuse in the DC power cord, no maintenance is required.

To replace a blown fuse:

  1. Press the ends of the fuse holder together. Twist to open. Carefully separate the two pieces.
  2. Remove the fuse and inspect. If blown, replace with the same type of fuse.


In the event of system malfunction, perform the following procedures:

Uniden PC68LTX 40-Channel CB Radio Owner Manual-fig 5

Uniden PC68LTX 40-Channel CB Radio Owner Manual-fig 6

If you do not get satisfactory results after performing these checks, visit www.uniden.com for information.



  • Channel: 40
  • Frequency Range: 26.965 – 27.405 MHz
  • Frequency Control: PLL Synthesizer
  • Antenna Impedance: 50 ohms
  • Power Input: 13.8VDC
  • Current Drain
    • TX: AM Full Modulation: 2.2A (max)
    • RX: At no signal: 400mA
  • Squelch: 250mA
  • Operating Temperature: -22°F to 140°F (-30°C to 60°C)
  • Accessories:
    • DC Power Cord
    • Microphone
    • Microphone Hanger
    • Mounting Bracket
  • Size (W x D x H): 6.3 in. x 6.4 in. x 2.2 in. (without knobs and jacks) (160 mm x 162.5 mm x 55.8 mm)
  • Weight: 3 Pounds


  • Output Power: 4 watts
  • Emission Type: 6K00A3E
  • Hum and Noise: Better than 40 dB
  • Frequency Tolerance: ±0.002%
  • Modulation Percentage (Peak): 100%
  • Spurious Rejection: -70 dB
  • Output Impedance: 50 ohm, unbalanced


  • Sensitivity at 10 dB S+N/N: 0.5 µV 
  • Sensitivity at 500 mW Audio Output: 0.5 µV
  • Squelch Threshold: 0.5 µV
  • Antenna Impedance: 50 ohms
  • Squelch Tight: 1000 µV
  • Signal Meter S-9: 100 µV
  • Audio Output Power (max.): 5 watts
  • Audio Output (10% Dist.): 4 watts
  • Adjacent Channel Rejection: 60dB
  • Image Rejection: 70dB
  • Internal Speaker Impedance: 16 ohms
  • External Speaker Impedance: 8 ohms


  • Output Power at 10% Distortion: 4 watts

Specifications shown are typical and subject to change without notice.


FCC Compliance Statement: This device complies with Part 15 of the FCC rules. Operation is subjected to the following two conditions: 

  1. this device may not cause harmful interference, and
  2. this device must accept any interference received, including interference that may cause undesired operation.


This device complies with Industry Canada license-exempt RSS standard(s). 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 of the device.


Important: Evidence of original purchase is required for warranty service.


  • ELEMENTS OF WARRANTY: Uniden warrants, for one year, to the original retail owner, this Uniden Product to be free from defects in materials and craftsmanship with only the limitations or exclusions set out below.

  • WARRANTY DURATION: This warranty to the original user shall terminate and be of no further effect one year after the date of the original retail sale. The warranty is invalid if the Product is
    • (A) damaged or not maintained as reasonable or necessary,
    • (B) modified, altered, or used as part of any conversion kits, subassemblies, or any configurations not sold by Uniden,
    • (C) improperly installed,
    • (D) serviced or repaired by someone other than an authorized Uniden service center for a defect or malfunction covered by this warranty,
    • (E) used 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.

  • STATEMENT OF REMEDY: If the product does not conform to this warranty at any time while this warranty is in effect, the warrantor will either, at its option, repair or replace the defective unit and return it to you without charge for parts, service, or any other cost (except shipping and handling) incurred by the warrantor or its representatives in connection with the performance of this warranty. Warrantor, at its option, may replace the unit with a new or refurbished unit.  Some states do not allow this exclusion or limitation of incidental or consequential damages so the above limitation or exclusion may not apply to you.

  • LEGAL REMEDIES: This warranty gives you specific legal rights, and you may also have other rights that vary from state to state. This warranty is void outside the United States of America.

  • 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 original packaging). The Product should include all parts and accessories originally packaged with the Product. Include evidence of the original purchase and a note describing the defect that has caused you to return it. The Product should be shipped freight prepaid, by traceable means,
    • to warrantor at:
      Uniden America Corporation 
      C/O Saddle Creek
      743 Henrietta Creek Rd., Suite 100
      Roanoke, TX 76262

FAQS About Uniden PC68LTX 40-Channel CB Radio

What is the CB radio power limit?

400 Watts

Does an antenna suit CB radios?

CB Antenna: A radio is useless without an antenna!

How are CB radio signals operated?

It picks up radio frequency signals and sends them to the transmitter, where the transmitter converts them into electrical impulses that the radio operator can understand.

How can I extend my CB radio’s range?

Elevate the antenna further.

What is the required voltage for a CB radio?

12–14 volts DC.

Does a speaker fit a CB radio?

Every CB radio has a speaker built in.

Are batteries required for CB radios?

Usually, handheld radios are powered by either an AC power source or batteries.

Where are CB radios built by Uniden?

Taiwan, the Philippines, China, and Hong Kong.

What is the CB radio frequency for the 40 channels?

27.405 MHz to 26.965 MHz.

Which height is ideal for a CB antenna?

Try to position the antenna so that two-thirds of it are above the vehicle’s roof line for the optimum performance.

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