Kraco KCB-2340 User manual

23-CHANNEL SOLID STATE AM/SSB MOBILE
CB TRANSCEIVER
MODEL KCB-2340
INSTRUCTION MANUAL

TECHNICAL SPECIFICATIONS
GENERAL
Circuitry 
Frequency Control

Channel 
Mode of Operation

Power Source Voltage Range

Speaker

Microphone .
Power Source 
36 Transistors, 5 FETs, 1 IC
Crystal synthesizing system
23 channels all installed
AM, LSB, USB
11.5 — 14.5V DC
3" dynamic, 8 ohms
Dynamic type
DC 13.8 volts
RECEIVER SECTION
Receiving System

Single conversion superheterodyne
Sensitivity

AM 1 pV for 10 dB S/N
SSB 0.25 pV for 10 dB S/N
Selectivity 
AM 4 kHz at 6 dB down
SSB 2.4 kHz at 6 dB down
Fine Tune (Clarifier) 
±600 Hz
Audio Output Power 
3W at 8 ohms
Squelch Range
 AM 1µV to 500 pV
SSB 0.7 pV to 20 pV
Intermediate Frequency

11.2735 MHz
SSB TRANSMITTER SECTION
SSB Generation 
RF Output Power

Carrier Suppression
Unwanted Sideband Suppression

Harmonic Suppression

AM TRANSMITTER SECTION
Modulation

RF Output Power 
Harmonic Suppression 
Balanced ring modulator with crystal
latice filter
High Level Class B
4 watts (Legal Maximum)
50 dB down
PEP 12 watts (Legal Maximum)

40 dB down
50 dB down
50 dB down

SELF TAPPING SCREWS
TRANSCEIVER
SECURING SCREW
WASHER
Figure 3. Mounting
The Model KCB-2340, is a full 23-channel, AM/SSB Citizens band mobile transceiver
designed for use under the license of Class "D" operation.
The features of this transceiver are:
• DC powered AM/SSB mobile station transceiver with the latest high performance.
•
Advanced frequency synthesizing circuitry assuring stable, reliable operation.
•
Built-in ANL (Automatic Noise Limiter) and NB (Noise Blanker) circuitries to
reduce undesirable noises for quiet reception.
• Clarifier which allows you to tune clearly to a station transmitting with slightly
off frequency.
•
Continuously variable Squelch control for quiet stand-by operation.
Built-in PA (Public Address) operation system.
Large illuminated Signal Strength and RF transmit power meter.
High power, high efficiency in transmitting, and high sensitivity in reception.
•
All front mount controls and switches for easy use.
•
Versatile, compact, rugged design.
•
RF gain control for better reception sensitivity.

F.C.C. REQUIREMENTS
IMPORTANT
This transceiver is designed for use under F.C.C. Rules and Regulations, VOL VI, Part 95 and you
are prohibited from operating this transceiver until you obtain your Citizens Band Class D License.
This license is obtained by filing Application Form 505 (supplied with the unit) with the F.C.C.
along with the proper filing fee. You are also required to read and understand Part 95 of the F.C.C.
Rules and Regulations and all licensees are required to maintain an up-to-date copy of these rules.
Subscription(s) must be filed with the Superintendent of Documents, Government Printing Office,
Washington, D.C. 20402. Adjustments to the transmitter circuit of-the transceiver may be made
only by, or under the supervision of a person holding a current commercial first or second class
radio operator license. Replacement or substitution of crystals or other components must be made
only by components supplied by Kraco Enterprises, Inc., 505 East Euclid Avenue, Compton,
California 90224.
MOBILE INSTALLATION
First choose a location for mounting. The location should be a place which is convenient to use
the transceiver and does not interfere with the driver. Usually the underside of the instrument panel
or dashboard of a vehicle will be selected. A special bracket for this purpose is supplied with the
unit.
1. The transceiver will be mounted as illustrated in Figure 3. First drill three or four holes
(diameter about 5/32"; 3.6 mm) in the location to be mounted.
2. Attach the bracket, using selftapping screws and washers supplied.
3. A microphone hanger is also supplied with the unit. If desired, attach the bracket on a place
close to the transceiver, using two screws included.
4. Secure the transceiver to the bracket by means of the large thumb screws and washers supplied.
DC POWER CONNECTION
This transceiver is designed to be operated from a 12V DC battery on Negative or Positive Ground
System.
A.  Power Connection For Negative Ground System
1. Connect Black power lead from the transceiver to the metal chassis ground of the
vehicle or negative battery terminal.
2. Connect Red power lead from the transceiver to any convenient hot (positive) side
of the electrical system or Plus (+) battery terminal.
B. 
Power Connection For Positive Ground System
1.  Connect Red power lead from the transceiver to the metal chassis ground of the vehicle
or positive battery terminal.


2. 
Connect Black power lead from the transceiver to any convenient hot (negative) side
of the electrical system or Minus (—) battery terminal.

NOTE:

If you are not sure of the electrical ground system employed in your vehicle, please
consult with your car dealer. But when you cannot obtain the necessary information,
directly connect the Red power lead to the Plus (+) battery terminal and Black power
lead to the Minus (—) battery terminal to avoid damaging the transceiver.
ANTENNA CONNECTION
BEFORE OPERATING THE TRANSCEIVER, YOU MUST CONNECT A PROPER ANTENNA
SYSTEM. OPERATING THE TRANSCEIVER WITHOUT AN ANTENNA OR A DUMMY LOAD
MAY CAUSE DAMAGE TO THE EXPENSIVE RF POWER TRANSISTORS.
The antenna is one of the most important factors in the operation of the transceiver with its full
efficiency. An improper antenna may decrease reception sensitivity and lower the communication
range in transmitting. The CB antenna and its mounting method will largely depend upon your
type of vehicle, mounting position, etc. Also the antenna may be different according to your
needs — using the transceiver as a mobile, or base station transceiver. We recommend you consult
the dealer from which you purchased the transceiver or any other CB/Amateur radio equipment
supply shop. They will meet your specific needs.
DESCRIPTION ON FRONT & REAR PANEL FACILITIES
VOLUME/POWER SWITCH
This turns power on or off. To turn the power on, rotate the knob clockwise; and to turn off,
rotate all the way counter clockwise until a click is heard. Turning the knob clockwise increases
the volume from the built-in speaker. This volume does not affect the transmit power.
SQUELCH CONTROL
This silences undesirable background noise when no signal is received. The squelch level can be
varied by adjusting the control knob. Usually this will be done as follows:
1.
Turn the power on and rotate the VOLUME knob until a background noise is heard.
2.
Then rotate the SQUELCH control knob clockwise until the background noise disappears.
3.
Now you can receive signals without annoying background noises. However, rotating the
squelch control too far clockwise direction decreases reception sensitivity and a very weak
station would not be received, therefore when you want to communicate with such a station,
rotate the squelch control all the way counter clockwise.
CLARIFIER
During AM operation, place the control in the "12" o'clock position. However, if a station received
is not clear, adjust the control for clearei reception.
5

During SSB operation, this control operates as a voice clarifier: also rotate the control for clearer
voice reception.
RF GAIN CONTROL
This control adjusts the RF gain of the receiver. To increase the RF gain (reception sensitivity),
turn the knob clockwise; and to decrease, turn counter clockwise.
When your transceiver is operated in an excessively strong signal strength area, the reception may
sound distorted due to the signal overload. To correct this, adjust the RF gain control to decrease
the reception sensitivity.
ANL-NB SWITCH
This is the switch which actuates the ANL (Automatic Noise Limitter) and NB (Noise Blanker)
circuits to reduce undesirable noises you may encounter during receive operation. The noise blanker
is the circuit designed to blank out impulse noises such as ignition noises from vehicles for quiet
reception. Place the switch in either position for minimum noise interference when the noise is
excessive.
CB-PA SWITCH
This selects the mode of operation. For normal CB operation, place the switch in the CB (released
out) position, and place in the PA (depressed) position when using the transceiver as a simple public
address amplifier.
SIGNAL STRENGTH/RF POWER METER
During reception, this indicates a relative signal strength in S unit on the upper scale. During trans-
mission, this indicates the transmit power from the antenna on the lower scale. The meter pointer
flickers slightly when you are speaking into the microphone, indicating your voice is being trans-
mitted.
CHANNEL SELECTOR
This selects one of full 23 channels you desire of AM, LSB and USB.
MIC JACK
This accepts 4-pin microphone plug from the Push-to-Talk Microphone supplied with the unit.
PA JACK
When you operate the transceiver as a simple Public Address amplifier, connect a PA speaker,
8-16 ohm, to this jack.

ANTENNA CONNECTOR
This accepts a standard PL-259 type coaxial antenna connector which should be connected to
the antenna cable end.
EXTERNAL SPEAKER JACK
This will be used when connecting an earphone or external speaker having impedance of about
8-16 ohms. Connecting the earphone or speaker plug into this jack automatically silences the
built-in speaker.
MODE SWITCH
This selects mode of operation; Lower Sideband (LSB), Upper Sideband (USB) and AM.
OPERATION
MAKE SURE YOUR ANTENNA SYSTEM IS CONNECTED TO THE ANTENNA CONNECTOR
ON THE REAR PANEL. DO NOT OPERATE THE TRANSCEIVER WITHOUT CONNECTION
OF YOUR ANTENNA SYSTEM.
A. AM Operation
1.
Connect the Push-to-Talk microphone to the MIC jack
•
2.
Place the CB/PA switch in the "CB" position.
3. Turn the power on and increase the sound level.
4. If necessary, adjust the SQUELCH control.
5. Place the LSB-USB-AM switch in the AM position.
6. Select a channel you desire.
7.
To transmit: Depress the Push-to-Talk button on the microphone and speak into the
microphone at a normal voice, holding the microphone 3 to 6 inches from the mouth.
Do not shout or move the microphone too close to your mouth.
8. To receive: simply release the Push-to-Talk button.
9. If necessary, adjust the CLARIFIER control and ANL/NB switch for clearer reception.
B.  SSB Reception
1.
Turn the power on and rotate the VOLUME control to a proper sound level.
2.
Temporarily place the LSB-USB-AM switch in the AM position. If the signal you received
is a AM signal, clear voice reception will be obtained. But if the signal produces
un-
intelligible sound, it may be the SSB signal. First place the LSB-USB-AM switch in the
LSB or USB position, where clearer voice reception is obtained. Then adjust the
CLARIFIER control slowly for better voice reception.
3. If necessary adjust SQUELCH and ANL/NB control.

C. 
SSB Transmit Operation
1.
First select the channel you want.
2. Place the LSB-USB-AM switch in the LSB or USB position.
NOTE: 
If you want to communicate with the station transmitting in a mode of LSB (or USB)
your transceiver must be set in the same mode LSB (or USB) of operation.
To identify the mode of operation (LSB or USB) being transmitted, temporarily try
to receive the station as stated under SSB reception (Paragraph "B" above).
3.
To transmit depress the Push-to-Talk button on the microphone and speak into the
microphone as stated in the step 7 under AM operation.
4.
To receive, simply release the Push-to-Talk button.
When using the transceiver as a public address amplifier
1.
Connect a PA speaker (8-16 ohms) to the PA jack on the rear panel.
2.
Place the PA/CB Switch in the PA position.
3. Turn the power on.
4.
Depress the Push-to-Talk button on the microphone and speak into the microphone.
INTERFERENCE NOISES IN MOBILE USE
During reception, you may find that your transceiver will pick up interference which makes the
reception of weaker stations difficult. The most common source of these noises is the ignition
system of your own vehicle, since your transceiver is placed relatively close to your ignition system
(engine). In such a case, we recommend you consult with your car dealer to eliminate the ignition
noise. Usually the ignition noise will be suppressed considerably by using a proper radio suppression
type high voltage ignition wire and suppressor resistor in the ignition system. (Most vehicles employ
this wire and resistor but it may be necessary to check them for correct operation). Another method
to suppress the noises is to use additional noise suppressor which will be available from CB/Amateur
radio equ" -
ment supplying shops.
8

LIMITED WARRANTY
Kraco warrants this product to be free from defects in material and workmanship under normal
use and service. This warranty limited to the replacement of defective parts, provided that defect
occurs within 90 days from date of purchase and provided that product is returned immediately
to Kraco. We will repair free of charge or replace at no charge any unit which our examination
shall disclose to be defective and under warranty.
This warranty shall be valid only when a purchaser has filled in and has on file at the factory a
warranty registration card. If no warranty card is on file, a sales receipt showing the date of purchase
must accompany the article being returned.
The provisions of this warranty shall not apply to any part which is used for a purpose for which
it is not designed, or which shall have been repaired or altered in any way, as to affect adversely
its performance and reliability.; nor shall this warranty apply to any part which has been subject
to misuse, neglect or accident.
Kraco does not authorize any other person to assume any other liability in connection with its
product and the implied warranty of mercantibility and fitness as limited to the duration of this
warranty.
Your unit will be serviced on an in-warranty basis within the guarantee period for the correction
of warranted defects if the unit is returned postage prepaid and packaged in the original shipping
carton with $5.00 to cover handling, return postage and insurance — check or money order only —
no stamps. Do not return the set to your dealer. Return your unit with the description of the
problem to:
KRACO STEREO WARRANTY DEPARTMENT, 505 East Euclid Avenue,
Compton, California 90224.

SCHEMATIC DIAGRAM OF MODEL KCB-2340

Kraco Enterprises Inc.
PRINTED IN JAPAN
KT-CB2340AX