TRC-484 40-Channel CB
(210-1556)                 Operation                  Faxback Doc. # 19199

CAUTION:  Do not attempt to use your CB without first connecting it to an
          antenna.

RECEIVING TRANSMISSIONS AND SETTING SQUELCH

To reduce or eliminate noise between transmissions, you must properly set
SQUELCH.

1.  Set PA-MON-CB to CB.

2.  Turn SQUELCH fully counterclockwise.

3.  Turn RF GAIN fully clockwise.

4.  Slide POWER to ON.

5.  Rotate VOLUME until you hear a hissing sound.

6.  Slowly turn SQUELCH clockwise until the hissing sound stops.

    NOTE:  To receive very weak signals, turn SQUELCH counterclockwise. You
           can hear noise between transmissions, but you can also hear weak
           transmissions.  If the CB picks up unwanted, weak transmissions,
           turn SQUELCH clockwise to reduce the CB's sensitivity to these
           signals.

7.  Rotate CHANNEL to select a channel.

    While you are holding the microphone, you can use the UP and DN buttons
    to select channels.  Press UP to go up to the next higher channel, or
    DN to go down to the next lower channel.

8.  If you receive an extremely strong signal, turn RF GAIN
    counterclockwise to decrease the overall signal level instead of using
    VOLUME.  Or, turn RF GAIN clockwise to boost the strength of a signal.

9.  To immediately tune to Channel 9 or 19 for motorist assistance or to 
    report emergency information about accidents, hazardous road
    conditions, and so on, set CH19/CH9/OUT to CH9 or CH19.  Set the switch
    to OUT to return to the previously selected channel.

Important!  Channels 9 and 19 are reserved for motorist assistance and for 
            reporting emergency information.  Always give emergency messages
            priority on Channels 9 and 19.

TRANSMITTING

NOTE:  We recommend you try receiving transmissions before you transmit.

1.  Follow Steps 1-9 in "Receiving Transmissions/Setting Squelch." (ABOVE)

2.  Hold the microphone about 3 inches from your mouth.  Then press and
    hold down the microphone's talk button and speak in a normal voice.

3.  When you finish transmitting, release the microphone talk button.  You 
    can now receive transmissions.

4.  To turn off the CB, slide POWER to OFF.

USING THE PA AMPLIFIER SYSTEM

Your CB has a built-in PA (public address)) amplifier.  With an optional PA  
speaker (available at your local Radio Shack store), you can use your CB as
a mobile public address system.

1.  Connect an external PA speaker to the CB's PA SP jack.

2.  Set PA-MON-CB to PA.

3.  Hold the microphone about 3 inches from your mouth.  Then press and
    hold down the microphone's talk button and speak in a normal voice.

4.  Adjust VOLUME to the desired level.  If you hear a high-pitched noise 
    (feedback), adjust VOLUME until the noise stops.

5.  If you want to monitor incoming CB broadcasts while you use the PA 
    function, set PA-MON-CB to MON.  The incoming CB broadcasts sound 
    through the PA speaker.

MAXIMUM RANGE

The maximum range and quality of CB transmissions vary depending on the
following conditions:

    The type and quality of antenna used

    The height of the antenna's mounting location-the higher the antenna,
    the better the reception

    The surrounding terrain-mountains and tall buildings limit the range

    Weather conditions

    The number of nearby CBs operating on the same channel

CB COURTESY

    Wait for a pause in someone else's transmission before you ask for a
    break.

    If you do not receive an answer after two calls to a station, sign off
    and let others use the channel.  Then try again later.

    Do not hold down the talk button when you are not talking.  (This is 
    called dead keying.)

    Help callers with directions, road conditions, and any other reasonable 
    requests.

USING 10-CODES

Citizen's band operators have largely adopted the 10-codes for standard
questions and answers.  These codes permit faster communication and better
intelligibility in noisy areas.  This table lists codes adopted by the
Associated Public Safety Communications Officers (APCO).

CODE MEANING (refer to Posted Doc.)

NOISE REDUCTION

Because your CB is exceptionally quiet, any noise you hear is probably from
an external source in your vehicle, such as the alternator or spark plugs.

You can determine the noise source by turning off the engine and operating
the CB with your vehicle's ignition set to ACC.  If the noise decreases,
the problem is in your vehicle's ignition or electrical system.  Here are a
few hints to help you reduce or eliminate noise:

    Make all CB power and antenna wires as short as possible.

    Keep the power wires away from the antenna wires.

    Be sure the chassis ground connection is secure.

    Replace old ignition wires with new, high-voltage, noise-suppression
    wires.

    Install noise suppressors on your spark plugs, or install new spark
    plugs that have built-in noise suppressors.

Your local Radio Shack store has a wide selection of noise-suppression
accessories.


(JC/all-02/19/96)