Radio Shack 21-1703 A User Manual

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21-1703A

Mini Mobile CB Radio

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.

What’s Included

CB Radio

Microphone

Holder

Mounting Bracket 5mm Machine Screw (2) 3mm Machine Screw (2)

5mm Self-tappingScrew (2)

3mm Self-tappingScrew (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

Contents

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

2

Product Features

Product Features

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Push to Talk (PTT)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Microphone

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Channel Display

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Shows the current

 

 

 

 

 

 

 

 

 

 

 

 

 

 

channel.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

CHANNEL

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Rotate to select

 

 

 

 

 

 

 

 

 

 

 

 

 

 

frequency.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

VOLUME

 

 

 

 

 

 

 

 

OUT CH9 CH19

 

 

 

 

 

 

 

 

Rotate to increase or

 

 

 

 

 

 

Switch to move between standard

decrease the speaker

 

 

 

 

 

 

frequencies and emergency channels.

volume.

 

 

 

 

 

 

 

 

 

 

TX / RX

 

 

 

 

 

 

 

 

 

 

SQUELCH

 

 

 

 

 

 

 

 

Shows when the radio

 

 

 

Rotate to adjust the amount of

is transmitting (TX), or

 

 

 

background noise.

receiving (RX).

 

 

 

 

 

 

 

Other Features

Full Legal Power – gives you the greatest available range.

Automatic Noise Limiter – reduces impulse-typenoises while receiving.

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

Phase-LockedLoop (PLL) Frequency Synthesizer – provides highly accurate and stable tuning.

Two Built-InCeramic Filters – ensure superior channel selectivity and freedom from adjacent channel interference.

Automatic Modulation Control – prevents the transmitter signal from overmodulating and distorting.

3

Setup

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-tappingscrews, and spring washers.

Holder

Spring washer

3mm self-tappingscrew

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-tappingscrews.

4

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-tappingscrews and plain washers to secure the bracket.

Mounting bracket

Mounting knob

5

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

EXT SPEAKER jack

ANTENNA jack

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.

6

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.

Notch

Tab

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 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 localRadioShack 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.

7

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 nonmetallic part.

Using the Transceiver

Negative (–)black wire

Positive (+) red wire

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.

8

Operation

Operation

Receiving Transmissions and Adjusting SQUELCH

1.Rotate SQUELCH fully counterclockwise.

2.Rotate VOLUME clockwise until it clicks to turn 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, rotate 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.

9

Operation

Operational Hints

Common Uses for CB Radios

Warn of traffic tie-upsahead.

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.

10