Radio Shack TRC-488 Bedienungsanleitung

Cat. No. 21-1585A

OWNER’S MANUAL

40-CHANNEL 2-WAY CB RADIO

Please read before using this equipment.

TRC-488

21-1585.fm Page 1 Thursday, August 5, 1999 9:39 AM

FEATURES

Radio Shack is a registered trademark used by Tandy Corporation.

Your Radio Shack TRC-488 40-Chan-

nel 2-Way CB Radio is a high perfor-

mance citizen’s band radio that also

lets you tune to national weather ser-

vice broadcasts. This CB is perfect for

recreational, business, or emergency

use. It lets you talk to other people with

CBs at home, in their vehicles, or at

camp sites. You can also connect op-

tional equipment to your CB, such as a

DC power supply and base station an-

tenna to set up a base station in your

home.

Your CB has the following features:

7-Channel WX Band Receiver — lets

you tune to seven national weather fre-

quencies so you can hear your local

weather conditions as well as weather

forecasts wherever you travel.

Emer

enc

Channel Selector — lets

you quickly switch to Channel 9 so you

can report or monitor emergency situ-

ations.

PLL (Phase-Locked Loop) Frequen-

nthesizer — provides reliable

and exact tuning.

steresis Squelch — automatically

adjusts receiver sensitivity to compen-

sate for fading signals and to eliminate

signal chopping during reception.

Two Ceramic Filters — provide supe-

rior channel selectivity and eliminate

adjacent-channel interference.

Automatic Noise Limitin

(ANL) —

reduces noise caused by nearby elec-

trical equipment such as motors or au-

tomotive ignition systems.

LED Channel Displa

— displays the

selected channel (1-40). When chan-

nel 9 is selected with the emergency

channel switch, the 9 flashes continu-

ously. When a weather channel is se-

lected, the display “blanks-out.”

RF Gain Control — lets you adjust the

receiver gain to match the strength of

the received signal.

Universal Mountin

Bracket — lets

you mount your CB securely in your

vehicle or on a table or shelf in your

home.

Important: To use this CB, you must

connect a mobile or base station an-

tenna (available at your local Radio

Shack store). See “Installing an Anten-

na” on Page 8.

For your records, we recommend you

record your CB’s serial number in the

space below. The serial number is lo-

cated on the CB’s back panel.

Serial No.

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CONTENTS

Installation ............................................................................................................ 4

Mounting the TRC-488 .................................................................................... 4

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

Connections ......................................................................................................... 6

Connecting the Microphone ............................................................................ 6

Connecting an Optional External Speaker ...................................................... 6

Connecting Power ........................................................................................... 7

Using Vehicle Battery Power .................................................................... 7

Using Standard AC Power ........................................................................ 7

Installing an Antenna ...................................................................................... 8

Adjusting the Antenna’s SWR ......................................................................... 9

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

Setting Squelch ............................................................................................. 10

Using Automatic Noise Limiting .................................................................... 10

Listening to Weather Broadcasts .................................................................. 10

Receiving Transmissions on the Channels ................................................... 11

Transmitting .................................................................................................. 12

CB Tips ............................................................................................................... 13

Common Uses for a CB Radio ...................................................................... 13

Business Uses ........................................................................................ 13

Personal Uses ........................................................................................ 13

CB Courtesy .................................................................................................. 13

Using Common 10-Codes ............................................................................. 14

Troubleshootin

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

Maximum Range ........................................................................................... 16

Reducing Noise ............................................................................................. 16

Maintenance ....................................................................................................... 17

Replacing the Fuses ..................................................................................... 18

FCC Information ............................................................................................ 18

Specifications .................................................................................................... 19

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INSTALLATION

MOUNTING THE TRC-488

If you use the TRC-488 as a base sta-

tion, you can mount it on a desk, shelf,

or table.

The most common mounting location

for the CB is under a vehicle’s dash-

board. If you use the TRC-488 in a ve-

hicle, mount it securely to avoid

damage to the CB or vehicle or injury

to anyone in the vehicle during sudden

starts or stops.

When you mount the CB in a vehicle,

make sure:

• You can easily reach the CB.

• Its wires and cables do not inter-

fere with any of the vehicle’s mov-

ing parts.

• The CB is not directly in front of

heating vents.

• All wires and cables reach their

connection points.

Follow these steps to mount the CB

using the supplied bracket, screws,

washers, and knobs.

1. Using the mounting bracket as a

template, mark the positions for

the screw holes.

2. In each marked location, drill a

hole slightly smaller than the sup-

plied screws.

Caution: Be careful not to drill into

any objects behind the mounting

surface.

3. Using a Phillips screwdriver,

attach the mounting bracket to the

mounting location with the sup-

plied screws and lock washers.

(illus)

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4. Attach the CB to the mounting

bracket using the supplied rubber

washers and mounting knobs.

MOUNTING THE

MICROPHONE HOLDER

With a Phillips screwdriver and the

supplied screws and washers, attach

the supplied microphone holder to the

CB’s right side.

(illus)

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CONNECTIONS

CONNECTING THE

MICROPHONE

1. Make sure the pins on the micro-

phone cable’s plug are aligned

with the holes in the CB’s MICRO-

PHONE jack on the CB’s left side

and insert the plug into the jack.

2. Slide the microphone onto the

microphone holder.

To disconnect the microphone cable,

press and hold down the small tab on

the microphone plug, then pull out the

plug.

Caution: Never pull on the micro-

phone cable.

CONNECTING AN

OPTIONAL EXTERNAL

SPEAKER

You can connect an external speaker

to the CB.

Notes:

• You must use an 8-ohm speaker

capable of handling up to 5 watts

of power (such as Radio Shack

Cat. No. 21-549).

• The speaker’s cable must have a

1/8-inch plug.

To connect an external speaker, sim-

ply plug the speaker’s cable into the

CB’s EXT jack.

Note: When you connect an external

speaker, the CB’s internal speaker dis-

connects.

(illus)

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CONNECTING POWER

Using Vehicle Battery Power

Follow these steps to power the CB

from your vehicle’s battery.

1. Make sure the CB is turned off.

2. Disconnect the cable from your

vehicle battery’s negative (–) ter-

minal.

3. Connect the black GROUND wire

to a metal part of your vehicle’s

frame.

Note: Be sure the metal part is not

insulated from the vehicle’s frame

by a plastic part.

4. Connect the red TO SWITCHED

ACCESSORY wire, with in-line

fuse, to a source of voltage that

turns on and off with the ignition

switch, such as a spare accessory

terminal in your vehicle’s fuse box.

5. Connect the orange BATT +wire,

with in-line fuse, to your vehicle

battery’s positive (+) terminal or to

a point in the vehicle’s fuse box

fuse that provides a continuous

source of 12 volts even when the

ignition is turned off.

This connection is for last-channel

memory backup.

6. Reconnect the cable to the vehi-

cle battery’s negative (–) terminal.

Using Standard AC Power

You can power the CB from a standard

AC outlet using a 12-volt DC power

supply (such as Cat. No. 22-120)

Caution: Most 12-volt DC power sup-

plies plug into a standard AC outlet to

produce DC power. Before connecting

your CB to a 12-volt DC power supply,

read and follow the instructions includ-

ed with the power supply.

1. Make sure the CB is turned off.

2. Make sure the power supply is

turned off.

(illus)

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3. Connect the black GROUND wire

to the DC power supply’s negative

(–) terminal.

4. Connect both the red TO

SWITCHED ACCESSORY and

orange

BATT +wires, with in-line

fuses, to the DC power supply’s

positive (+) terminal.

These wires supply power to oper-

ate your CB and backup the last-

channel memory.

5. Connect the DC power supply to a

standard AC outlet.

INSTALLING AN

ANTENNA

Caution: To prevent damage to your

CB, you must connect an antenna to

the CB before you operate it.

Note: Your local Radio Shack store

sells a variety of CB antennas for both

mobile and base-station use, and co-

axial antenna cable and connectors.

For the best performance,consider the

following when deciding on an antenna

and its location:

• The antenna and cable should be

as far as possible away from

sources of electrical noise.

• The antenna should be located

vertically and as high as possible.

Follow these steps to connect an an-

tenna.

1. Follow the mounting instructions

that come with the antenna.

Warnin

: Use extreme caution

when you install or remove a base

station CB antenna. If the antenna

starts to fall, let it go! It could con-

tact overhead power lines. If the

antenna touches the power line,

your 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.

(illus)

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2. Route the cable between the

antenna and the CB.

3. Connect the cable to the

ANTENNA jack on the back of the

CB.

Caution: Do not run the cable:

• Over sharp edges or moving parts

that might damage the cable

• Next to power cables or other CB

antenna cables

• Through the engine compartment

or other areas that produce

extreme heat

ADJUSTING THE

ANTENNA’S SWR

To achieve your CB’s maximum range,

the antenna’s Standing Wave Ratio

(SWR) should be adjusted 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 pos-

sible value. SWR values of 2.0:1 are

generally acceptable, with readings of

1.5:1 or lower being more desirable.

(illus)

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OPERATION

SETTING SQUELCH

Caution: Do not attempt to use your

CB without first connecting it to an an-

tenna.

1. Turn VOLUME clockwise until it

clicks to turn on the CB, then set it

to about halfway between the min-

imum and maximum settings. The

CB tunes to the last-selected

channel.

2. Turn

SQUELCH fully counterclock-

wise. You hear background noise

and the green BUSY LED lights.

3. Adjust VOLUME to a comfortable

setting.

4. Turn SQUELCH clockwise just until

the background noise stops.

Note: To receive weaker transmis-

sions, turn SQUELCH counter-

clockwise.

USING AUTOMATIC

NOISE LIMITING

If you hear low-level popping noises

while receiving transmissions, slide

ANL/OFF to ANL to turn on the auto-

matic noise limiting circuit. Otherwise,

leave ANL/OFF set to OFF (see “Re-

ducing Noise” on Page 16).

LISTENING TO

WEATHER

BROADCASTS

The FCC (Federal Communications

Commission) has allocated 11 chan-

nels for use by the National Oceano-

graphic and Atmospheric Admin-

istration (NOAA). NOAA broadcasts

your local forecast and regional weath-

er information on one or more of these

channels in your area.

(illus)

21-1585.fm Page 10 Thursday, August 5, 1999 9:39 AM

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