Radio Shack TRC-502 User manual

Cat. No. 21-1702

OWNER’S MANUAL

Please read before using this equipment.

TRC-502

40-Channel Mini Mobile CB Radio

21-1702.fm Page 1 Thursday, August 5, 1999 1:02 PM

FEATURES

Your RadioShack TRC-502 40-Channel

Mini Mobile CB Radio is a great way to

communicate with other CB radio opera-

tors. Because of its convenient compact

size, you can use it just about anywhere.

You can mount it in a vehicle for mobile

use, or in your home or office for use as

a base station.

Your CB has these advanced features.

Up/Down Channel Selector — lets you

easily select a channel with the press of

a button.

TX (Transmit) Indicator — lights to

show when the CB is transmitting.

Automatic Noise Limiter (ANL) Circuit

— reduces impulse-type noise during

reception.

5-Pin Din Mic Connector — uses five

prongs to reinforce a clear connection

between the mic and the receiver.

Full Le

al Power — gives you the full

range of CB channels with the maximum

allowed transmit power.

ustable Squelch — helps to elimi-

nate noise between transmissions.

Automatic Modulation — prevents the

transmitter signal from over-modulating

and distorting.

(PLL) Frequenc

nthesizer — pro-

vides highly accurate and stable tuning.

stal-Controlled Di

ital Tunin

—

provides precise transmission tuning ca-

pability when selecting a channel.

Two Ceramic Filters — provide superi-

or channel selectivity and prevent adja-

cent channel interference.

Universal Mountin

Bracket — lets

you mount your CB securely in your ve-

hicle, or on a table or shelf in your home

or office.

External Antenna Jack — lets you at-

tach an optional antenna to your CB ra-

dio for increased range.

We recommend you record your CB’s

serial number here. The number is on

the bottom of the CB.

Serial Number: ___________________

RadioShack is a registered trademark used by Tandy Corporation.

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FCC INFORMATION

The Federal Communications Commis-

sion (FCC) does not require you to have

a license to operate this CB radio. How-

ever, you must know Part 95 of

FCC

Rules

. These rules apply to the opera-

tion of a Class D CB. We have provided

a copy of these regulations with your CB

radio.

Warning: Do not open your CB radio to

make any internal adjustments. A CB ra-

dio is set up to transmit a regulated sig-

nal on an assigned frequency. It is

against the law to alter or adjust the set-

tings inside the unit to exceed these lim-

itations.

To be safe and sure:

• never open your CB radio’s cases.

• never change or replace anything in

your CB radio.

Your CB radio might cause TV or radio

interference even when it is operating

properly. To determine whether your CB

radio is causing the interference, turn off

your CB radio. If the interference goes

away, your CB is causing it. Try to elimi-

nate the interference by:

• moving your CB radio away from the

TV or radio

• contacting your local RadioShack

store for help

If you can not eliminate the interference,

the FCC requires that you stop using

your CB radio.

This device complies with Part 95 of

FCC Rules

. Operation is subject to the

following two conditions: 1) this device

may not cause harmful interference, and

2) this device must accept any interfer-

ence received, including interference

that may cause undesired operation.

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CONTENTS

Installation ............................................................................................................... 5

Mounting the Microphone Holder ....................................................................... 5

Mounting the CB ................................................................................................. 5

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

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

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

Using the CB as a Base Station ......................................................................... 8

Operation ............................................................................................................... 10

Receiving Transmissions and Adjusting Squelch ............................................. 10

Transmitting ...................................................................................................... 11

Operational Hints .................................................................................................. 12

Common Uses for a CB .................................................................................... 12

Personal Uses ............................................................................................ 12

Business Uses ........................................................................................... 12

Transmission Courtesy ..................................................................................... 12

Using Common 10-Codes ................................................................................ 13

Maximum Range .............................................................................................. 14

Reducing Noise ................................................................................................ 14

Troubleshootin

.................................................................................................... 15

Care and Maintenance .......................................................................................... 16

Replacing the Fuse ........................................................................................... 17

Specifications ........................................................................................................ 18

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INSTALLATION

MOUNTING THE

MICROPHONE HOLDER

You can mount the microphone holder

to either side of the CB or to another lo-

cation near your receiver.

Caution: Do not mount the CB micro-

phone holder where it could damage or

interfere with the operation of any pas-

sive restraint safety device (an airbag or

seat belt).

To mount the holder to either side of the

CB, use the two supplied 1/8-inch (3-mm)

machine screws, plain washers, and

spring washers as shown to secure the

holder.

To mount the holder near the receiver in

another location in your vehicle (such as

a dashboard), or somewhere in your

home or office, such as a nearby wall,

follow these steps.

1. Using the holder as a template,

mark the positions for the screw

holes at the desired location.

2. At each marked position, drill a hole

slightly smaller than the mounting

screws.

Caution: Be careful not to drill into

anything behind the mounting sur-

face.

3. Mount the holder using the machine

screws, spring washers, plain wash-

ers and nuts.

Note: If you cannot reach behind the

mounting surface to attach the nuts to

the machine screws, use the two sup-

plied 1/8-inch (3-mm) screws and plain

washers.

MOUNTING THE CB

The most common mounting location for

this CB is under a vehicle’s dashboard.

However, if you use the TRC-502 as a

base station in your home or office, you

can place it on a desk, shelf, or table

(see “Using the CB as a Base Station”

on Page 8).

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 and other moving

parts.

Mounting Surface

21-1702.fm Page 5 Thursday, August 5, 1999 1:02 PM

• the CB is not directly in front of heat-

ing vents.

• all wires and cables can reach their

connection point.

Cautions:

• If you use the CB in a vehicle,

mount it securely to avoid damage

to the CB or vehicle or injury to pas-

sengers.

• Do not mount the CB where it could

damage or interfere with the opera-

tion of any passive restraint safety

device (an airbag or seatbelt).

Follow these steps to mount the CB us-

ing the supplied hardware.

1. Using the mounting bracket as a

template, mark the positions for the

screw holes on the mounting sur-

face.

2. In each marked location, drill a hole

slightly smaller than the two 1/5-inch

(5-mm) mounting screws.

Caution: Be careful not to drill into

objects behind the mounting sur-

face.

3. Mount the bracket to the mounting

surface with the 1/5-inch (5-mm)

mounting screws, spring washers,

plain washers, and nuts.

Note: If you cannot reach behind

the mounting surface to attach the

nuts on the bolts, use the 1/5-inch (5-

mm) mounting screws and plain

washers to secure the bracket.

4. Attach the CB to the mounting

bracket using the two rubber wash-

ers and mounting knobs.

CONNECTING AN

ANTENNA

There are many different types of anten-

nas for mobile CBs, each with its own

benefits. You can choose one that best

fits your needs. Your local RadioShack

store sells a wide variety of antennas.

Note: If you are using this CB as a base

station, see “Using the CB as a Base

Station” on Page 8.

Mounting

Surface

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When you choose an antenna, keep in

mind that, for the best performance, you

should mount the antenna:

• as high as possible on your vehicle,

home or building

• as far as possible from source of

electrical noise

• vertically

Once you choose an antenna, follow its

mounting instructions. Then route the

cable to the CB and connect the cable to

ANTENNA on the back of the CB.

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 radio antenna

cables.

• Do not run the cable through a vehi-

cle’s engine compartment or other

areas that produce extreme heat.

To take advantage of your radio’s maxi-

mum range, adjust the antenna’s Stand-

ing Wave Ratio (SWR) using an SWR

meter (such as Cat. No. 21-523).

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 general-

ly acceptable, with readings of 1.5:1 or

lower being more desirable.

CONNECTING THE

MICROPHONE

1. Press the plastic tab on the top of

the supplied microphone’s plug and

align the 5-pin DIN microphone plug

with the corresponding pin holes in

the CB’s MIC jack. Then push the

plug into the mic jack.

2. Slide the microphone onto the

microphone holder.

To disconnect the microphone from the

CB, press the plastic tab on the side of

the plug, then pull out the plug.

Caution: Never pull on the microphone

cable.

Tab

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USING VEHICLEBATTERY

POWER

Follow these steps to connect the CB to

vehicle battery power.

1. Connect the red wire (with in line

fuse holder) to a point in your vehi-

cle’s fuse block that has power only

when the ignition is in the ACC 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 CB AS A

BASE STATION

Although this CB radio 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:

• a 13.8V DC power supply that can

supply at least 1.5 amps (such as

Cat. No. 22-504)

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.

• base station antenna (such as Cat.

No. 21-969)

• coaxial antenna cable and connec-

tor (available at your local

RadioShack store)

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 the power

line, contact with the antenna, mast, ca-

ble or guy wires can cause electrocution

and death. Call the power company to

remove the antenna. Do not attempt to

remove it yourself!

Red Wire to

Switched ACC

Terminal

Black Wire to

Ground

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Follow these steps to install the CB as a

base station.

1. Mount the base station antenna as

described in it’s owner’s manual.

2. Connect the antenna to ANTENNA.

3. Connect the CB’s black power wire

to the negative (–) terminal on the

DC power supply.

4. Connect the CB’s red wire to the

positive (+) terminal on the DC

power supply.

5. Connect the DC power supply to a

standard AC outlet.

Caution: To prevent damage to the CB,

be sure you connect an antenna and the

microphone before you use the CB.

Black Wire

to Ne

ative

Red Wire

to Positive

Antenna

Terminal of

DC Power

Terminal of

DC Power

Suppl

Wire

21-1702.fm Page 9 Thursday, August 5, 1999 1:02 PM

OPERATION

Before you use your CB, you should

know how to use it effectively and cour-

teously. “Operational Hints” on Page 12

contains information that will help you

get more enjoyment from our CB.

RECEIVING

TRANSMISSIONS AND

ADJUSTING SQUELCH

1. Turn SQUELCH fully counterclock-

wise.

2. Turn on the CB by turning VOLUME

clockwise until it clicks. The channel

display lights and the channel num-

ber appears.

3. Press or on the base

to select the desired channel.

4. Adjust VOLUME to a comfortable lis-

tening level.

5. To cut out background noise

between transmissions, wait until

there is no signal, then slowly turn

SQUELCH clockwise until the back-

ground noise stops.

Note: To receive very weak signals,

turn SQUELCH counterclockwise.

You hear noise between transmis-

sions, but you also hear weak trans-

missions.

6. To turn off the CB, turn VOLUME

counterclockwise until you hear it

click. The channel display turns off.

21-1702.fm Page 10 Thursday, August 5, 1999 1:02 PM

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