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Cobra 29wx Stcb Tranciever Manual

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    							OPERATING INSTRUCTIONS FOR YOUR
    40 CHANNEL
    CITIZENS BAND 
    2-WAY MOBILE RADIO
    Model
    29 WX ST
    Cobra Electronics Corporation
    6500 W. Cortland Street
    Chicago, IL 60707
    PRINTED IN HONG KONG ©COBRA ELECTRONICS CORP. 1997 480-113-P-001 
    						
    							The Citizens Band lies between the shortwave broadcast and 10-meter Amateur radio
    bands, and was established by law in 1949. The Class D two-way communications ser-
    vice was opened in 1959. (CB also includes a Class Acitizens band and Class C remote
    control frequencies.)
    FCC regulations permit only ÒtransmissionsÓ (one party to another) rather than
    ÒbroadcastsÓ (to a wide audience). Thus, advertising is not allowed on CB Channels
    because that is Òbroadcasting.Ó
    What Is Weather Radio?
    NOAAWEATHER RADIO (NWR) is a service of the National Oceanic and
    Atmospheric Administration (NOAA), of the U.S. Department of Commerce. It pro-
    vides continuous, around-the-clock broadcasts of the latest weather information
    directly from National Weather Service Offices. The broadcasts are tailored to the
    weather-information needs of people within the receiving area. For example, coastal
    and Great LakesÕ stations provide specialized weather information for area boaters,
    fishermen and others engaged in marine activities, as well as general weather infor-
    mation for the public-at-large. Three hundred eighty (380) NWR stations are in oper-
    ation by the U.S. Government in addition to several NWR stations that are main-
    tained by private interest groups.
    Under the January 1975 White House policy statement, NOAAWeather Radio was des-
    ignated as the sole Government operated radio system to provide direct warnings into
    private homes for both natural disasters and nuclear attack. The capability is to sup-
    plement warnings by sirens and by commercial radio and television.
    NWR Frequencies and Transmission Characters
    NWR broadcasts have been allocated seven frequencies within the VHF radio spec-
    trum reserved for Government use. Assigned frequencies are:
    162.400 MHz162.475 MHz162.525 MHz
    162.425 MHz162.500 MHz162.550 MHz
    162.450 MHzReplacement or substitution of transistors, regular diodes or other parts of a unique
    nature, with parts other than those recommended by Cobra, may cause violation of the
    technical regulations of Part 95 of the FCC Rules, or violation of Type Acceptance
    requirements of Part 2 of the Rules.
    Citizens Band (CB) Radio operators are no longer required to obtain an FCC license to
    operate their CB equipment  or provide station identification.
    Nevertheless, an operator of a CB radio station is still required to comply with the com-
    munications act and with the rules of CB Radio Operation.
    The CB Story
    1
    How To Use YourCitizens Band 
    2-Way Mobile RadioModel 29 WX ST
    ContentsPage
    The CB Story............................................................................................1
    SoundTracker System............................................................................1
    What is Weather Radio?........................................................................1
    Specifications........................................................................................2,3
    Installation
    Location..................................................................................................4
    Mounting Connections....................................................................4, 5
    CB Antenna..........................................................................................6
    Ignition Noise Interference................................................................7
    Operation
    Controls and Indicators............................................................8, 9, 10
    Operating Procedure to Receive......................................................11
    Operating Procedure to Transmit....................................................11
    Operating Procedure to Receive Weatherband..............................12
    How SoundTracker Works................................................................13
    Maintenance and Adjustment............................................................14
    Appendix
    Ten Code..............................................................................................15
    AFew Rules That Should Be Obeyed............................................16
    How Your CB Can Serve You..........................................................16
    Warranty Service Instructions............................................................17
    Limited Two Year Warranty................................................................18
    Accessories..................................................................Inside Back Cover
    “Cuts Static coming in, adds Punch going out!”
    Cobra proudly introduces the first Patent Pending technology that dramatically
    improves the transmission and reception of CB radio signals.
    This revolutionary system reconfigures the transmission signal which allows it to be
    transferred more effectively through cluttered airwaves. It literally ÒpunchesÓ your
    message through the hundreds of thousands of signals that are in the air. At the same
    time, SoundTracker system dynamically adjusts the relationship between the signal
    and static commonly referred to as noise. This allows CobraÕs SoundTrackersystem to
    significantly reduce the amount of static on all incoming CB signals. The system can be
    further optimized when two SoundTracker CBÕs are used to talk to each other.
    The end result is a clearer, cleaner sounding reception of signals and more powerful
    transmissions which 
    dramaticallyimprove CB Communications 
    						
    							Specifications (cont.)
    GENERALChannels40 
    Frequency Range26.965 to 27.405 MHz.
    Frequency ControlPhase Lock Loop (PLL) synthesizer.
    Frequency Tolerance0.005%.
    Operating Temperature Range-30¡C to + 50¡C.
    MicrophonePlug-in dynamic.
    Input Voltage13.8VDC nom.(positive or negative ground).
    Current DrainTransmit: AM full mod., 1.5A(maximum)
    Receive: Squelched, 0.3A; full audio output, 1.2A
    (nominal).
    Size8 5
    /
    8Ó D  x 79
    /
    32Ó W  x 2 13
    /
    64Ó H .
    Weight4 lbs.
    Antenna ConnectorUHF, SO-239.
    Semiconductors26 transistors, 26 diodes, 4 integrated  circuits.
    Meter Illuminated; indicates relative power output and
    received signal strength.TRANSMITTERPower Output4 watts. 
    ModulationAM (Amplitude Modulation).
    Frequency Response300 to 3000 Hz.
    Output Impedance50 ohms, unbalanced.RECEIVERSensitivityLess than 1 µV for 10dB (S+N)/N.
    Selectivity6dB @ 7 KHz, 60 dB @ 10 KHz. 
    Image Rejection 80 dB, typical.
    Adjacent-Channel Rejection60 dB, typical.
    IF FrequenciesDouble Conversion: 1st: 10.695 MHz.
    2nd: 455 KHz.
    Automatic Gain Control (AGC)Less than 10 dB change in audio output for inputs
    from 10 to 50,000 microvolts.
    RF Gain ControlAdjustable for optimum signal reception.
    Noise BlankerRF type.
    SquelchAdjustable; threshold less than 1µV.
    Audio Output Power4 watts.
    Frequency Response300 to 3000 Hz.
    DistortionLess than 7% @ 3 watts @ 1000 Hz.
    Built-in Speaker16 ohms, round.
    External Speaker (Not Supplied)8 ohms; disables internal speaker when connected.PASYSTEMPower Output4 watts into external speaker.
    External Speaker for PA8 ohms, when PA-CB switch is in PA, the PAspeak-
    er also monitors the receiver; separate jack provid-
    ed. 
    (SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE) (Not Supplied)
    3
    ChannelChannel Frequency 
    in MHz
    2127.215
    2227.225
    2327.255
    2427.235
    2527.245
    2627.265
    2727.275
    2827.285
    2927.295
    3027.305
    3127.315
    3227.325
    3327.335
    3427.345
    3527.355
    3627.365
    3727.375
    3827.385
    3927.395
    4027.405
    Specifications
    FREQUENCYRANGE
    The COBRA29 WX ST transceiver represents one of the most advanced AM
    two-way radios ever designed for use as a Class D station in the Citizens Radio
    Service. This unit features advanced Phase Lock Loop (PLL) circuitry providing
    complete coverage of all 40 channels as shown below.
    ChannelChannel Frequency 
    in MHz
    126.965
    226.975
    326.985
    427.005
    527.015
    627.025
    727.035
    827.055
    927.065
    1027.075
    1127.085
    1227.105
    1327.115
    1427.125
    1527.135
    1627.155
    1727.165
    1827.175
    1927.185
    2027.205
    The COBRA29 WX ST has a vastly superior receiver which includes noise blanker
    circuitry and an automatic noise limiter. The receiver also features increased 
    protection against cross modulation and strong adjacent channel signals.
    To obtain maximum performance please read carefully the descriptions and
    operating instructions in this manual. Fill out below; keep for your records.Serial No.
    Date of Purchase
    Dealer Name
    Keep this manual for detailed information about your Cobra CB radio.
    SAVE YOUR SALES RECEIPT, CARTON AND PACKING FOR POSSIBLE
    FUTURE  USE.
    2 
    						
    							5
    Installation (Cont.)
    3.
    Connect the antenna cable plug to the standard receptacle on the unit. Most
    CB antennas are terminated with a type PL-259 plug which mates with the
    receptacle marked ANT.
    4.
    Connect the red lead of DC power cord to +13.8 VDC. In automobile instal-
    lations, +13.8 VDC is usually obtained from the accessory contact in the
    fuse box. This prevents the set being left on accidentally and also permits
    operating the unit without the vehicles engine running.
    Before installing the CB radio, visually check the vehicle battery connec-
    tions to determine which battery terminal, positive or negative (positive
    is the larger of the two) is grounded to the engine block (or chassis).
    5.
    Connect he black lead to the negative side of the automobile. This is usual-
    ly the chassis of the car. Any convenient location with good electrical con-
    tact (remove paint) may be used. Plug power cable into jack on back of
    transceiver.
    In positive ground automobiles the red wire goes to the chassis and the
    black wire is connected to the ignition switch.
    6.
    When 13.8 volts DC is initially applied to radio, the radio will turn on
    (when power switch is in OFF position) for 1 second. This is the emergency
    weather alert normal initialization procedure.
    7.
    Mount microphone bracket on right side of the transceiver, or near it using
    two screws supplied. When mounting in an automobile, place the bracket
    under the dash so the microphone is readily accessible.
    Installation
    Location
    Plan the location of the transceiver and microphone bracket before starting the
    installation. Select a location that is convenient for operation and does not inter-
    fere with the driver or passengers in the vehicle. In automobiles, the transceiver
    is usually mounted to the underneath of the dash panel, with the microphone
    bracket beside it.
    Mounting and Connection
    The transceiver is held in the universal mounting bracket by two thumbscrews,
    permitting adjustment at the most convenient angle.
    Auniversal mounting bracket is supplied along with self tapping screws and
    star washers. The mounting must be mechanically strong and also provide a
    good electrical connection to the chassis of the vehicle. To mount the transceiv-
    er:
    1.
    Determine the most convenient location in your vehicle, hold the COBRA
    radio with mounting bracket in the exact location desired. If nothing will
    interfere with mounting it in the desired position, remove the mounting
    bracket and use it as a template to mark the location for the mounting
    screws.
    2.
    Drill necessary holes and secure mounting bracket in location.
    4 
    						
    							7
    Installation (Cont.)
    Ignition Noise Interference
    Use of a mobile receiver at low signal levels is normally limited by the presence
    of electrical noise. The primary source of noise in automobile installations is
    from the alternator and ignition system in the vehicle. Under most operating
    conditions, when signal level is adequate, the background noise does not present
    a serious problem. Also, when extremely low level signals are being received, the
    transceiver may be operated with vehicle engine turned off. The unit requires
    very little current and therefore will not significantly discharge the vehicle bat-
    tery.
    Even though the COBRA29 WX ST has an automatic noise limiter, in some in-
    stallations ignition interference may be high enough to make good communica-
    tions impossible. The electrical noise may come from several sources. Many pos-
    sibilities exist and variations between vehicles require different solutions to
    reduce the noise. Consult your COBRAdealer or a 2-way radio technician for
    help in locating and correcting the source of severe noise.
    Base Station Operation (Operation from 120VAC, House Current)
    To operate your transceiver from your home or office, using the regular house
    current as the power source, you will require a 12 VDC power pack that has
    been specially designed for the purpose. It is available as optional equipment
    from your COBRAdealer. It consists of a 120-volt, 60 Hz AC to 12-volt DC
    power converter that delivers the required power for the operation of the
    transceiver. Simply connect the red (+) and black ( - ) leads of the transceiver to
    the corresponding terminals of the power packs.
    DO NOT ATTEMPT TO OPERATE THIS TRANSCEIVER BY
    CONNECTING DIRECTLY TO 120 VAC.
    Temporary Mobile Operation
    To operate your COBRAtransceiver from a car on a temporary basis, you may
    want to purchase an optional cigar lighter adapter from your COBRAdealer.
    This adapter and a magnetic mount antenna allow you to quickly install your
    transceiver for temporary use.
    6
    CB Antenna
    Since the maximum allowable power output of the transmitter is limited by the
    FCC, the antenna is one important factor  affecting transmission distance. Only
    a properly matched antenna system will allow maximum power transfer from
    the 50 ohm transmission line to the radiating element. In mobile installations
    (cars, trucks, boats, etc.), an antenna system that is non-directional should be
    used.
    Avertically polarized, quarter-wavelength whip antenna provides the most reli-
    able operation and greatest range. Shorter, loaded-type whip antennas are more
    attractive, compact and adequate for applications where the maximum possible
    distance is not required. Also, the loaded whips do not present the problems of
    height imposed by a full quarter-wavelength whip.
    Mobile whip antennas utilize the metal body of the vehicle as a ground plane.
    When mounted at a corner of the vehicle they are slightly directional, in the di-
    rection of the body of the vehicle. For all practical purposes, however, the radia-
    tion pattern is nondirectional. The slight directional characteristic will be
    observed only at extreme distances. Astandard antenna connector (type SO-239)
    is provided on the transceiver for easy connection to a standard PL259 cable
    termination. Cobra loaded type antenna models are highly recommended for
    most installations. Consult your Cobra dealer for further details, or call 773-889-
    3087 and speak to a Cobra customer representative.
    WX Antenna
    For best reception of weather channels, we recommend dual band antennas
    which provide optimum CB and WX reception. If you want more information
    about models and prices, call our consumer hotline 773-889-3087.
    When installed in a boat, the transceiver will not operate at maximum efficien-
    cy without a ground plate, unless the vessel has a steel hull. Before installing the
    transceiver in a boat, consult your dealer for information regarding an adequate
    grounding system and prevention of electrolysis between fittings in the hull and
    water.
    3-Way Combination Antennas are available which allow operation of all three
    bands (AM-FM & CB), using a single antenna. However, use of this type of
    antenna usually results in less than normal transmit and receive range when
    compared to a standard-type Single Band antenna designed for CB only. The
    quality of reception of radio signals is highly dependent on the antenna sys-
    tem. Typical CB antennas may not be very efficient when used for WX recep-
    tion. Call 773-889-3087 for further information.
    Installation (Cont.) 
    						
    							Operation (Cont.)
    9
    6.
    DELTA-TUNE.For normal operation, set this control to the center posi-
    tion. This feature has several uses and can greatly enhance receiver oper-
    ation. If a received signal is slightly off frequency, the Delta-Tune control
    can be used to Òfine-tuneÓ your receiver. Fine tuning is accomplished by
    listening for a more readable signal at the speaker or by noting the S-
    meter reading when the Delta-Tune control is operated.
    Another use of this control is eliminating adjacent interference. If an
    exceptionally high level signal from an adjacent channel is creating inter-
    ference on the channel being used, the Delta-Tune can be used to mini-
    mize or eliminate the interference. Rotate the control until you obtain
    minimum adjacent channel interference. NOTE:Delta-Tune is operable
    only in the receivemode.
    7.WEATHER CHANNELSELECTOR. This switch selects any one of the
    seven U.S. NOAAWeatherband broadcast stations (see p. 1). Always keep
    set to local NOAAFrequency. See enclosed brochure and card for NOAA
    travel information. NOTE: The Weather Alert Tone can be turned off by
    positioning this selector in the off location.8.SWR CAL. Used to calibrate the meter for SWR (standing wave ratio)
    measurements. Simply switch to CAL, press the PTT switch on the
    microphone and calibrate the meter.9.CHANNELSELECTOR SWITCH.This switch selects any one of forty
    Citizens Band channels desired. The selected channel is indicated by the
    LED readout (17), directly above the channel selector knob.10
    .S/RF/SWR/CALSWITCH.When in the S/RF position, the meter swings
    proportionally to the strength of the received signal. When transmitting,
    the meter indicates relative RF output power.
    When in the CAL position, the SWR meter can be calibrated by adjust-
    ing the SWR CAL control to the CAL mark on the meter face.
    When in the SWR position, the standing wave ratio is measured.
    11
    .NB-ANL/ANL/ OFFSWITCH:When this switch is in the ANLposition,
    only the automatic noise limiter in the audio circuits is activated. When it
    is in the NB/ANLposition, the RF noise blanker also is activated. The RF
    noise blanker is very effective for repetitive impulse noise, such as igni-
    tion interference.
    12
    .PA/CBSWITCH:.Selects the mode of operation. In the CB position, the
    PAfunction is disabled and the unit will transmit and receive on the
    selected frequency. The PAfunction should not be used unless a PAspeaker is
    connected. In the PAmode, incoming CB transmissions will be heard
    through the PAspeaker. This allows you to monitor messages when you
    are not inside your vehicle.
    13.
    CB/WX SWITCH. Used for selection between receiving Weatherband
    broadcasts or normal CB operation. The radio will not transmit in the
    Weatherband mode. Controls and Indicators
    Refer to controls, indicators and connectors as illustrated below:
    A. Front Panel
    1.
    MICROPHONE CONNECTOR.Front panel microphone connector.
    2.
    OFF/ON/VOLUME.Turn clockwise to turn power on and set the
    desired listening volume.
    3.
    SQUELCH.This control is used to cut off or eliminate receiver back-
    ground noise in the absence of an incoming signal. For maximum receiv-
    er sensitivity it is desired that the control be adjusted only to the point
    where the receiver background noise or ambient background noise is
    eliminated. Adjust until the receiver noise disappears. This will require
    the incoming signal to be slightly stronger than the average receiver
    noise. Further clockwise rotation will increase the threshold level which
    a signal must overcome in order to be heard. Only strong signals will be
    heard at a maximum clockwise setting.
    4.
    DYNAMIKE.Adjusts the microphone gain in the transmit and PA
    modes. This controls the gain to the extent that full talk power is avail-
    able several inches away from the microphone. In the Public Address
    (PA) mode, the control functions as the volume control.
    5.
    RF GAIN.Adjust as required to optimize signal. This control is used pri-
    marily to optimize reception in strong signal areas. Gain is reduced by
    counterclockwise rotation of the control. 
    Operation
    8
    11
    12
    14
    18
    19
    16
    17
    15
    13
    1
    2
    3
    4
    5
    6
    8
    9
    10
    7 
    						
    							Operation (Cont.)
    11
    C. Rear Panel1.
    PUBLIC ADDRESS:An external 8-ohm 4.0 watt PAspeaker may be connect-
    ed to the PASpeaker Jack when this unit is used as a public address system.
    The speaker should be directed away from the microphone to prevent acoustic
    feed-back. Physical separation or isolation of the microphone and speaker
    must be employed when operating the PAat high output levels.
    2.
    EXTERNALSPEAKER:The External Speaker Jack is used for remote receiver
    monitoring. The external speaker should have 8-ohm impedance and be rated
    to handle at least 4.0 watts. When the external speaker is plugged in, the inter-
    nal speaker is automatically disconnected.
    3.
    ANTENNACONNECTOR:This SO-239 connector permits connection of the
    transmission line cable PL-259 connector to the transceiver.
    4.
    POWER. This jack permits connection of the DC power to the transceiver. A
    power cord with polarized plug is supplied with the radio. The polarized plug
    ensures that the power will always be connected properly.
    Operating Procedure to Receive CB Broadcasts
    1.
    Be sure that the power cord, antenna and microphone  are connected to the
    proper connectors before proceeding further. The PA/CB  should be in the CB
    position.
    2.
    Turn the radio ON by rotating the VOLUME CONTROLclockwise.
    3.
    Set the RF GAIN CONTROLfully clockwise.
    4.
    Rotate SQUELCH CONTROLcounterclockwise until incoming signal is heard.
    5.
    Set the Channel Selector Switch to the desired channel.
    6.
    Set VOLUME CONTROLto a comfortable listening level.
    7.
    Engage the SoundTracker system by depressing the buttons labeled ST.
    SoundTracker system allows you to reduce unwanted background noise (stat-
    ic) and increase the signal for better reception.
    Listen to the background noise from the speaker. Turn the SQUELCH CONTROL
    slowly clockwise until the noise JUSTdisappears (no signal should be present).
    Leave the control at this setting. The squelch is now properly adjusted. The receiv-
    er will remain quiet until a signal is actually received. Do not advance the control
    too far, or some of the weaker signals will not be heard.
    1
    2
    3
    4
    14.
    CH.19/CH.9/NORMALSWITCH. Used for instant selection of emer-
    gency Channel 9 (CH. 9 position) or information Channel 19. In NOR-
    MALposition, all 40 CB channels are selected by the CHANNELSELEC-
    TOR switch (9).
    15.
    S-METER. Swings proportionally to the strength of the incoming signal
    during receiving. The S/RF-SWR-CALswitch must be in the S/RF position.
    RF-METER.Swings proportionally to the RF output power while trans-
    mitting. The S/RF-SWR-CALswitch must be in the S/RF position.
    SWR METER.Measures standing wave ratio of the antenna system.
    Used to properly adjust the length of the antenna and to monitor the
    quality of the coaxial cable and all RF electrical connections. If there is any
    degradation whatsoever in any of the foregoing, due to humidity, salt
    spray, vibration or corrosion, the SWR meter reading will rise, thereby
    indicating that a problem exists.
    To calibrate, switch to the CAL position, transmit by pressing the mike
    switch, and adjust the SWR control to the CAL mark on the meter; then
    switch to SWR position for the SWR measurement.
    16
    .RX/TX/WX LEDINDICATOR.When your radio is in the CB receive
    mode, the LED will be green. When in transmit mode, the LED will be red
    and in Weatherband mode, the LED will be orange.
    17.
    LED CHANNELDISPLAY.The selected channel will be displayed.
    Display will be off when radio is in Weatherband mode.
    18.
    SOUNDTRACKER™ SWITCH.Depressing this button turns on the
    SoundTracker system in your CB.
    19.
    SOUNDTRACKER™ INDICATOR.Ared LED will illuminate when the
    SoundTracker system is engaged on your CB.
    B. PRESS-TO-TALK MICROPHONE.Both the receiver and transmitter are
    controlled by the Press-to-Talk switch on the microphone. Press the switch and
    the transmitter is activated; release the switch to receive. When transmitting,
    hold the microphone two inches from the mouth and speak clearly in a nor-
    mal voice. The microphone provided with your radio is a detachable low-
    impedance dynamic type. The  radio will not transmit in the Weatherband
    mode even though pressing the microphone switch will cause the red TX LED
    to illuminate.
    Operation (Cont.)
    10 
    						
    							13 12
    Operation (Cont.)Operating Procedure to Transmit
    1.
    Be sure the operator has read and understands part 95, F.C.C. Rules and
    Regulations prior to operating the transmitter.
    2.
    Select the desired channel.
    3.
    Set the DYNAMIKE control fully clockwise.
    4.
    The receiver and transmitter are controlled by the pr
    ess-to-talk switch
    on the
    microphone. Press the switch and the transmitter is activated; release switch
    to receive. When transmitting (on a clear channel), hold the microphone two
    inches from the mouth and speak clearly in a normal voice.
    Be sure the antenna is properly connected to the radio before transmitting.
    Prolonged transmitting without an antenna, or a poorly matched antenna,
    could cause damage to the transmitter. 
    Operating Procedure for Public Address
    1.
    Connect a PAspeaker to the PAjack provided on the rear panel.
    2.
    Place PA/CB/ANLswitch into the PAposition.
    3.
    Depress push-to-talk switch on micÑspeak in normal voice.
    4.
    Adjust PAspeaker volume with front panel DYNAMIKE control.
    When the Volume control is rotated clockwise, activity on the CB channel
    will be heard through the PAspeaker.
    Operating Procedure to Receive Weather Band
    1.
    Place CB/WX Switch in the WX position
    2.
    Turn the Weather Channel Selector (1-7) until you find the Weather Channel
    with the clearest reception. Sometimes more than one channel can be
    received depending on your location in the broadcast area; however, the
    closest broadcast to you will be the one with the clearest signal (the least sta-
    tic or background noise).
    3.
    If threatening weather is nearby, the National Weather Service may broad-
    cast a 10 second alert tone. This tone will be heard through the CB, even if
    the CB/WX Switch is in the CB mode or the unit is turned off if desired (see
    NOTE below). This enables you to monitor CB frequencies and still be
    warned by the National Weather Service Emergency Alert. When you hear
    the alert, place the CB/WX switch in the WX position. You will then be able
    to hear the Weather Warning Broadcast.
    NOTE: If you are using the CB mode, remember to change the CB/WX
    Switch from CB to WX every so often to make sure you are continually
    tuned to the clearest/closest weather band channel in case an alert is
    broadcast.
    4.
    You can completely disable the Emergency Weather Alert feature by turning
    the Weather Channel Selector to the OFF position.
    How SoundTracker Works
    SOUNDTRACKER SYSTEMWhile previous systems only Òblanked outÓ or limited noise in higher sound
    frequencies, the revolutionary new SoundTracker System actually reduces noise
    while leaving the signal intact in the reception mode. In the transmission mode,
    it actually strengthens the signal, providing you with a significant reduction in
    noise on reception and transmission.Sound clarity is measured by the ratio of the signal level to the noise
    level. The higher the signal-to-noise ratio, the better the sound.
    HOW SOUNDTRACKER WORKSOn Reception–
    “Cuts Noise Coming In”
    With a normal CB, distant signals fall below the squelch level and are unintelli-
    gible. With a SoundTracker CB, the noise level is cut by up to 90%, which
    increases the signal-to-noise ratio and dramatically improves signal clarity. This
    also allows you to significantly reduce the squelch level, which greatly expands
    your listening range.On Transmission–
    “Strengthens Signals Going Out”
    ASoundTracker CB strengthens the transmit signal by more effectively using
    the available RF power output of the CB. The result is improved transmission
    signal clarity and an expanded transmission range. 
    						
    							15 14
    Maintenance and Adjustment
    The COBRACB transceiver is specifically designed for the environment encoun-
    tered in mobile installations. The use of all solid state circuitry and its light weight
    result in high reliability. Should a failure occur, however, review the following,
    then if necessary, replace parts only with identical parts. Do not substitute. Refer
    to the schematic diagram and parts. 
    1.Check connections to the source of power and make sure it is the 13.8 VDC
    required to operate your radio.
    2.Check the fuse in the DC power cord. The main power lead (red wire) has
    a 2 Amp 3AG type fuse in its holder. Use only the above specified type and
    size fuse for maximum protection. Failure to do so, will void the warranty.
    3.Make certain the microphone is properly plugged in.
    4.Make certain the antenna is properly connected and tuned for minimum
    SWR. NOTE:COBRAantennas include full instructions as to how to tune
    your antenna. If youre still in doubt about the procedure, contact the
    COBRAdealer from whom you purchased your radio and antenna, for
    advice. If you hired an installer to install your radio and antenna, contact
    the installer.
    If you are unable to correct the problem, refer the WARRANTYSERVICE
    INSTRUCTIONS at the end of this manual for the correct procedure for warran-
    ty and post-warranty service from COBRA.
    Adjustment Warning
    Replacement or substitution of certain parts with replacements other than those
    recommended by COBRA, may be a violation of the technical regulations of Part
    95 of the FCC Rules, or of Type Acceptance requirements of Part 2 of said rules.
    When making adjustments other than transmitter adjustments, be sure to re-
    read applicable portions of this instruction manual to make certain you are fol-
    lowing correct procedure and that the radio was properly installed, etc.
    For technical assistance, please call our Automated Help Desk 
    which can assist you by answering the most 
    frequently asked questions about Cobra products.
    (773) 889-3087
    24 hours a day, 7 days a week.
    AConsumer Service Representative can be reached through this same
    number 8:00 am - 8:00 pm, Monday through Friday, CST.
    Technical assistance is also available on-line in the Frequently Asked
    Question (FAQ) section at www.cobraelec.com or by e-mail 
    to [email protected]
    10-35Confidential information
    10-36Correct time is
    10-37Wrecker needed at
    10-38Ambulance needed at
    10-39Your message delivered
    10-41Please turn to channel
    10-42Traffic accident at
    10-43Traffic Tie up at
    10-44I have a message for you
    10-45All units within range 
    please report
    10-50Break channel
    10-60What is next message number?
    10-62Unable to copy, use phone
    10-63Net directed to
    10-64Net clear
    10-65Awaiting your next 
    message/assignment
    10-67All units copy
    10-70Fire at
    10-71Proceed with transmission
    in sequence
    10-77Negative contact
    10-81Reserve hotel room for
    10-82Reserve room for
    10-84My telephone number is
    10-85My address is
    10-91Talk closer to mike
    10-93Check my frequency on 
    this channel
    10-94Please give me a long count
    10-99Mission completed, all 
    units secure
    10-200Police needed at
    Appendix
    Citizens Band radio operators have largely adopted the Ò10-codeÓ for standard
    questions and answers. Its use permits faster communications and better under-
    standing in noisy areas. The following table lists some of the more common
    codes and their meanings:
    CodeMeaningCodeMeaning
    10-1Receiving poorly
    10-2Receiving well
    10-3Stop transmitting
    10-4OK, message received
    10-5Relay message
    10-6Busy, stand by
    10-7Out of service, leaving air
    10-8In service, subject to call
    10-9Repeat message
    10-10Transmission completed, 
    standing by
    10-11Talking too rapidly
    10-12Visitors present
    10-13Advise Weather/Road 
    conditions
    10-16Make pick up at
    10-17Urgent business
    10-18Anything for us?
    10-19Nothing for you, return 
    to base
    10-20My location is
    10-21Call by telephone
    10-22Report in person to
    10-23Stand by
    10-24Completed last assignment
    10-25Can you contact
    10-26Disregard last information
    10-27I am moving to channel
    10-28Identify your station
    10-29Time is up for contact
    10-30Does not conform to FCC rules
    10-32I will give you a radio check
    10-33EMERGENCYTRAFFIC
    10-34Trouble at this station 
    						
    							Appendix (Cont.)If You Think  You Need Service  
    						
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