Radio Shack 21-1703 A User manual

Thank you for purchasing your Mini Mobile CB Radio from RadioShack.

Please read this user’s guide before installing, setting up and using your new

product.

21-1703 A

CB Radio

Microphone

Holder

Mounting Bracket

5mm Machine Screw (2)

3mm Machine Screw (2)

5mm Self-tapping Screw (2)

3mm Self-tapping Screw (2)

Spring Washer (2 big + 4 small)

Plain Washer (2 big + 4 small)

Nut (2 big + 2 small)

Mounting Knob (2)

Rubber Washer (2)

User’s Guide

Mini Mobile CB Radio

What’s Included

ontents

Product Features......................................................................... 3

Setup.......................................................................................... 4

Attaching the Microphone Holder.....................................................4

Mounting the Transceiver...................................................................5

Connecting an Antenna......................................................................6

Connecting the Microphone..............................................................7

Connecting an External Speaker......................................................7

Using Vehicle Battery Power..............................................................8

Using the Transceiver...............................................................................8

Operation.................................................................................... 9

Receiving Transmissions and Adjusting Squelch...........................9

Transmitting.........................................................................................9

Selecting the Emergency Channel...................................................9

Operational Hints.............................................................................10

Common Uses for CB Radios.................................................................10

Transmission Courtesy ............................................................................10

Using Common 10-Codes...............................................................10

Maximum Range..............................................................................11

Additional Information............................................................... 12

Troubleshooting................................................................................12

Reducing Noise................................................................................12

Care and Service..............................................................................13

Replacing the Fuse..........................................................................13

6SHFLÀFDWLRQV ...................................................................................14

RF Emissions Information..............................................................15

Limited Warranty.............................................................................16

Product Features

Other Features

Full Legal Power – gives you the greatest available range.

Automatic Noise Limiter – reduces impulse-type noises while receiving.

External Speaker Jack – provides a connection for an external speaker.

Phase-Locked Loop (PLL) Frequency Synthesizer – provides highly accurate and

stable tuning.

Two Built-In Ceramic Filters – ensure superior channel selectivity and freedom

from adjacent channel interference.

Automatic Modulation Control – prevents the transmitter signal from over-

modulating and distorting.

Product Features

TX / RX

Shows when the radio

is transmitting (TX), or

receiving (RX).

Channel Display

Shows the current

channel.

VOLUME

Rotate to increase or

decrease the speaker

volume.

SQUELCH

Rotate to adjust the amount of

background noise.

OUT CH9 CH19

Switch to move between standard

frequencies and emergency channels.

CHANNEL

Rotate to select

frequency.

Microphone

Push to Talk (PTT)

Setup

Attaching the Microphone Holder

You can attach the microphone holder to either side of the transceiver or to

another location in your vehicle.

To attach the holder to either side of the transceiver, secure the holder to the

side using the supplied 3mm self-tapping screws, and spring washers.

To attach the holder to another location in the vehicle, such as the dashboard,

follow these steps.

1. Using the holder as a template, mark the positions for the mounting screw

holes at the desired location.

2. At each marked position, drill a hole slightly smaller than the supplied

mounting screws.

3. Attach the holder at the mounting location using the supplied 3mm

machine screws, spring washers, plain washers, and nuts.

Note: If you cannot reach behind the mounting surface to attach the nuts on

the machine screws, use the supplied 3mm plain washers and self-tapping

screws.

Holder

3mm self-tapping

screw

Spring washer

Setup

Mounting the Transceiver

Cautions:

• If you use this CB in a vehicle, mount it securely to avoid damage to the CB

or vehicle, or injury to anyone in the vehicle during sudden starts or stops.

• Do not mount the CB where it could damage or interfere with the

operation of any passive restraint safety device (an airbag or seat belt).

• Be careful not to drill into objects behind the mounting surface.

If you are mounting the CB in a vehicle, choose a location where:

• You can easily reach the CB.

• Wires and cables are clear of the vehicle’s pedals or other moving parts.

• The CB is not directly in front of heating vents.

• All wires and cables can reach their connection points.

The most common mounting location for this CB is under the vehicle’s

dashboard. However, if you plan to use the CB as a base station, you can place it

on a desk, shelf, or table (see “Using the Transceiver” on p.8).

To mount the CB under your dashboard:

1. Using the supplied mounting bracket as a template, mark the positions for

the screw holes on the mounting surface.

2. At each marked location, drill a hole slightly smaller than the supplied

mounting screws.

3. Mount the bracket to the mounting surface with the supplied 5mm machine

screws, spring washers, plain washers, and nuts.

4. Attach the CB to the bracket using the supplied rubber washers and

mounting knobs.

Note: If you cannot reach behind the mounting surface to attach the nuts on

the machine screws, use the 5mm self-tapping screws and plain washers to

secure the bracket.

Mounting knob

Mounting bracket

Setup

Connecting an Antenna

There are many different types of CB radio antennas for mobile CBs. Each type

has its own beneﬁts, so choose the one that best meets your needs.

Note: If you are using this CB as a base station, see “Using the Transceiver” on p.8.

Once you choose an antenna, follow its mounting instructions. Then route the

cable to the transceiver and connect the cable to the ANTENNA jack on the

back of the transceiver.

For the antenna’s best performance, you should mount the antenna:

• as high as possible on the vehicle

• as far as possible from sources of electrical noise

• vertically

To take advantage of your CB’s maximum range, you can adjust the antenna’s

standing wave ratio (SWR) using an SWR meter (not supplied).

Follow the instructions supplied with the SWR meter and antenna to adjust your

antenna’s SWR to the lowest possible value. SWR values of 2.0:1 are generally

acceptable, with readings of 1.5:1 or lower being more desirable.

Cautions:

• Avoid routing the cable next to sharp edges or moving parts, which might

damage the cable.

• Do not run the cable next to power cables or other CB antenna cables.

• Do not run the cable through the engine compartment or other areas that

produce extreme heat.

ANTENNA jack

EXT SPEAKER jack

Setup

Connecting the Microphone

1. Press the tab on the side of the supplied microphone’s plug and insert the

plug into the MIC jack on the front of the transceiver. Be sure the tab is

aligned with the jack’s notch.

2. Slide the microphone onto the microphone holder.

To disconnect the microphone from the transceiver, press the tab on the side of

the plug. Then pull out the plug.

Caution: To avoid damaging the microphone, never pull on the microphonemicrophone, never pull on the microphone, never pull on the microphone

cable.

Connecting an External Speaker

Your transceiver also can be connected to an external CB speaker (not supplied).

Note: When you connect an external speaker, the CB’s internal speaker

disconnects.

The external speaker you use with the transceiver should have an impedance of

8 ohms and be able to handle 3 to 10 watts of power. The speaker cable must

have a 1/8-inch (3.5mm) plug. Your local RadioShack store carries a variety of

speakers and cables to meet your needs.

To connect the external speaker to the transceiver, insert the speaker cable’s

plug into the EXT SPEAKER jack on the back of the CB.

Tab

Notch

Setup

Using Vehicle Battery Power

To connect the transceiver to the vehicle battery power:

1. Connect the red wire (with the inline fuse holder) on the back of the

transceiver to a point in your vehicle’s fuse

block that has power only when the ignition is

in the ACC (accessory) or ON position.

2. Connect the black wire to a metal part of the

vehicle’s frame (chassis ground).

Caution: Do not connect the black wire to a

non-metallic (plastic) part, or to any part

insulated from the vehicle’s chassis by a non-

metallic part.

Using the Transceiver

Although this transceiver is designed mainly for mobile use, you can also use

it as a base station with an AC power source. For base station installation, you

need these items (not supplied):

• a 13.8V DC power supply that can supply at least 1.5 amps

• base station antenna

• coaxial antenna cable and connector

Warning: Use extreme caution when you install or remove a base station CB

antenna. If the antenna starts to fall, let it go! It could contact overhead power

lines. If the antenna touches a power line, contact with the antenna, mast, cable,

or guy wires can cause electrocution and death. Call the power company to

remove the antenna. Do not attempt to do so yourself!

Follow these steps to install the CB as a base station.

1. Mount the base station antenna as described in its owner’s manual.

2. Connect the antenna to the ANTENNA jack on the back of the CB.

3. Connect the transceiver’s black power wire to the negative (–) terminal on

the DC power supply.

4. Connect the transceiver’s red wire to the positive (+) terminal on the DC

power supply.

5. Connect the DC power supply to a standard AC outlet.

Caution: Most 13.8V DC power supplies plug into a standard AC outlet to

produce DC power. Before connecting your CB to a 13.8V DC power supply,

read and follow the instructions included with the power supply.

Negative (–)

black wire

Positive (+)

red wire

Operation

Receiving Transmissions and Adjusting SQUELCH

1. Rotate SQUELCH fully counterclockwise.

2. Rotate VOLUME clockwise until it clicks to turn on the transceiver. Theturn on the transceiver. The

channel display lights and the channel appears, and the RX indicator lights.

3. Set OUT CH9 CH19 to OUT if you want to select a channel other than an

emergency channel.

4. Rotate the channel selector until the display shows the desired channel.

5. Adjust VOLUME to a comfortable listening level.

6. To cut out background noise between transmissions, wait until there is no

signal, then slowly rotate SQUELCH clockwise until the background noise

stops.

7. To turn off the CB, rotateotate VOLUME counterclockwise until it clicks. The

display and indicators turn off.

Note: To receive very weak signals, turn SQUELCH counterclockwise. You will

hear noise between transmissions, but you will also hear weak transmissions

(those not strong enough to break through a higher squelch setting).

Transmitting

Follow steps 1 – 5 in “Receiving Transmissions and Adjusting SQUELCH”.

To transmit, hold down PUSH TO TALK (PTT) on the microphone and speak. The

TX indicator lights. Release PUSH TO TALK when you ﬁnish transmitting. The TX

indicator turns off.

To turn off the CB, rotate VOLUME counterclockwise until it clicks. The display

and RX indicator turn off.

Selecting the Emergency Channel

Important: Channel 9 is reserved for motorist assistance and for reporting

emergency information about accidents, hazardous road conditions, and so

on. Always give emergency messages priority on Channel 9. To select the

emergency Channel 9, set OUT CH9 CH19 to CH9. The selected channel

number ﬂashes on the display.

Channel 19 is used by truck drivers for general communication purposes. To

select this channel, set OUT CH9 CH19 to CH19.

To select another channel, set OUT CH9 CH19 to OUT. The previously selected

channel number appears on the display.

Operation

Operational Hints

Common Uses for CB Radios

• Warn of trafﬁc tie-ups ahead.

• Help truck drivers and delivery personnel learn road and trafﬁc conditions

and get assistance in locating destinations.

• Provide fast help in the event of emergency or breakdown.

• Help construction crews coordinate the activities of different work crews.

• Assist communication between security ofﬁcers.

• Provide weather and road information.

• Contact friends or other CB users on road trips.

• Keep in touch with your ofﬁce or home.

• Bring more fun for camping, ﬁshing, and other sports; help locate a friend

or ﬁnd out what’s cooking back at camp.

Transmission Courtesy

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

• If you do not receive an answer to your call after a second attempt, sign off

and wait several minutes before trying again.

• Do not hold down PTT when you are not talking. (This is called dead

keying.)

• Assist callers with directions, information about road conditions, and any

other reasonable request.

Using Common 10-Codes

Citizen’s band operators and users have largely adopted the 10 codes for

standard questions and answers. These codes permit faster communication and

better intelligibility in noisy areas.

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