Radio Shack TRC-495 Bedienungsanleitung

Cat. No. 21-1579

OWNER’S MANUAL

40-Channel CB Base Station Transceiver

Please read before usin

this equipment.

TRC-495

21-1579.fm Page 1 Thursday, August 5, 1999 9:34 AM

FEATURES

Radio Shack is a registered trademark used by Tandy Corporation.

Your Radio Shack TRC-495 40-

Channel CB Base Station Transceiv-

er is a compact, 40-channel CB spe-

cially designed for use as a Class D

citizen's band base station. The

TRC-495 transmits with the maxi-

mum power allowed by the FCC, so

your signal really gets out. Its built-in

PLL (phase-locked loop) frequency

synthesizer uses a precise frequency

reference crystal for reliable and ex-

act tuning.

You can operate the CB from either

120 volts AC or 12 volts DC, so you

can use it at home or the office, even

when AC power fails. With a base

station in your home or office and a

mobile CB in your vehicle, you can

stay in touch wherever you go, with-

out the expense of mobile telephone

operation. You can also talk with oth-

er CBs for business or just for fun.

Your CB also has the following valu-

able features:

Lar

e Analo

Meter — lets you see

how well you are “getting out,” and

how well others are “getting in.”

Scan — seeks out other CB users by

searching through all channels for

transmissions.

Switchable Noise Blanker and Au-

tomatic Noise Limiter — reduce in-

terference from ignition systems,

motors, and other electrical equip-

ment.

RF Gain Control — helps prevent

overloading from strong signals.

steresis Squelch Circuit — com-

pensates for signal fading and elimi-

nates signal chopping when you

listen to a broadcast.

Two Ceramic Filters — give superi-

or selectivity and freedom from adja-

cent channel interference.

CH9 Switch — lets you quickly

switch to Channel 9, used for emer-

gencies or motorist assistance.

Channel Displa

— shows the se-

lected channel in large red digits, for

easy viewing in most lighting condi-

tions.

NB, ANL, and SCAN Indicators —

show you when you are in the Noise

Blanker, Automatic Noise Limiter, or

Scan mode.

External Speaker and Headphone

Jacks — let you connect another

speaker or headphones to your CB.

21-1579.fm Page 2 Thursday, August 5, 1999 9:34 AM

Note: You need a base station an-

tenna to operate this CB. Your local

Radio Shack store has a variety of

antennas. See “Connecting an An-

tenna.”

For your records, we urge you to

record the serial number of your CB

in the space below. You'll find the se-

rial number on the back panel of the

CB.

Serial Number _________________

Warning: To prevent fire or shock

hazard, do not expose this product to

rain or moisture.

This symbol is intended to alert

you to the presence of uninsulat-

ed dangerous voltage within the

product’s enclosure that might be

of sufficient magnitude to consti-

tute a risk of electric shock. Do not

open the product’s case.

This symbol is intended to inform

you that important operating and

maintenance instructions are in-

cluded in the literature accompa-

nying this product.

FCC STATEMENT

The Federal Communications Com-

mission (FCC) does not require you

to get a CB license to operate your

CB. However, you are required to

know Part 95 of

FCC Rules

. This in-

formation applies to the operation of

a Class D citizen's band CB. A copy

of Part 95 is enclosed with your CB.

Your CB might cause TV or radio in-

terference, even when it is operating

properly. To determine whether your

CB is causing the interference, turn

off your CB. If the interference goes

away, your CB iscausing the interfer-

ence. Try to eliminate the interfer-

ence by:

• Moving your CB away from the

receiver.

• Connecting your CB to an outlet

that is on a different electrical

circuit from the receiver.

• Contacting your local Radio

Shack store for help.

If you cannot eliminate the interfer-

ence, the FCC requires that you stop

using your CB.

RISK OF ELECTRIC SHOCK.

DO NOT OPEN.

CAUTION: TO REDUCE THE RISK OF

ELECTRIC SHOCK, DO NOT REMOVE

COVER OR BACK. NO USER-SERVICE-

ABLE PARTS INSIDE. REFER SERVIC-

ING TO QUALIFIED PERSONNEL.

CAUTION !

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TABLE OF CONTENTS

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

Selecting a Location .................................................................................. 5

Connecting an Antenna ............................................................................. 5

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

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

Using Standard 120-Volt AC Power .................................................... 7

Using 12-Volt DC Power ..................................................................... 7

Connecting an External Speaker ............................................................... 8

Connecting Headphones ........................................................................... 8

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

Receiving Transmissions ........................................................................... 9

Transmitting ............................................................................................. 10

Using Special Controls ........................................................................... 10

Using CH9 .......................................................................................... 11

Using SCAN ....................................................................................... 11

Using NB and ANL ............................................................................. 11

Using RF GAIN ................................................................................. 12

CB Courtesy ............................................................................................ 12

Maximum Range ..................................................................................... 12

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

Troubleshootin

........................................................................................... 14

Noise Reduction ...................................................................................... 15

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

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

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

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INSTALLATION

SELECTING A

LOCATION

Choose a location for your CB that is

near a standard AC power outlet and

your antenna installation and away

from sources of electrical noise.

CONNECTING AN

ANTENNA

An antenna is an important part of

your CB installation. Choose and in-

stall the antenna with care.

Consider the following when you in-

stall the antenna:

• Mount the antenna as far as

possible from soures of electri-

cal noise (power lines, trans-

formers, ignition systems,

electrical motors, and so on) and

keep the antenna's cable away

from these noise sources.

• Provide a good ground for the

antenna with UL-listed compo-

nents.

• Be sure the antenna cable's

shield is securely connected.

• Mount the antenna as high as

possible without exceeding 60

feet above the ground or 20 feet

higher than the highest point on

a building.

• For the best performance, the

antenna must be tuned (see the

instructions provided with the

antenna) and positioned verti-

cally.

Select an antenna with a PL-259

connector. This type of antenna

works most efficiently as a base sta-

tion antenna. For example, a 1/2-

wave base station antenna (Radio

Shack Cat. No. 21-967) is a high-effi-

ciency antenna that has omni-direc-

tional characteristics. You can use

this type of antenna for medium and

long-range communications.

Use coaxial cable with an impedance

of 50 ohms to connect the antenna to

your CB. We suggest you use RG-

58/U for lengths under 10 feet, or

RG-8/U for longer lengths, and keep

the length of the antenna cable to a

minimum.

Once you select the antenna, mount

it following the instructions supplied

with it. Then route the cable to the CB

and connect the cable to the ANT

connector on the back of the CB.

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Warning: When installing or remov-

ing a base station CB antenna, use

extreme caution. If the antenna starts

to fall, let it go! It could contact over-

head power lines. If the antenna

touches the power line, contact with

the antenna, mast, cable, or guy

wires can cause electrocution and

death. Call the power company to re-

move the antenna. DO NOT attempt

to do so yourself.

CONNECTING THE

MICROPHONE

Mount the supplied microphone clip

on the leftside oftheCB, horizontally

or vertically, using the two supplied

screws. Then slide the microphone

onto the microphone holder.

Connect the microphone cable to the

MIC jack on the front panel. Press

the tab on the top of the microphone

plug and match the notch in the plug

with the top notch in the jack. Then

insert the plug into the jack.

To remove the microphone cable,

press the tab and pull the plug out of

the jack. Never pull on the micro-

phone cable.

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CONNECTING POWER

You can power your CB from either

standard 120-volt AC or from a 12-

volt DC source, such as a storage

battery.

Using Standard 120-Volt AC

Power

When you use a standard 120-volt

AC power source, set the power se-

lect switch on the back of the CB to

120V AC.

Then plug the CB's AC power cord

into a standard AC outlet.

Note: The plug is polarized (one

blade is bigger than the other) so it

only fits one way. If it will not fit, turn

it over and try again. Do not force it.

Using 12-Volt DC Power

If you want to use your CB where

120-volt AC power is not available

(for example, when AC power fails or

at a remote location), you can power

your CB from 12-volt DC power. Use

the supplied DC power lead (with in-

line fuse).

Follow these steps to connect the CB

to 12-volt DC power.

1. Connect the plug end of the DC

power leads to the 13.8V DC

power jack on the back of the

CB.

2. Set the power select switch on

the back of the CB to 13.8V DC.

3. Connect the red and black

power leads to the DC power

source as follows:

• Connect the red lead (with in-

line fuse holder and fuse) to

the source’s (+) terminal.

• Connect the black lead to the

source’s negative (–) terminal.

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CONNECTING AN

EXTERNAL SPEAKER

You can connect an external speaker

to the EXT.SP. jack. Use an 8-ohm

speaker that has a power rating of 3

to 10 watts and a 1/8-inch plug.

Notes:

• Your local Radio Shack store

carries a full line of speakers,

including one (Cat. No. 21-549)

specifically designed for use as

an external CB speaker.

• Connecting an external speaker

silences the CB's internal

speaker.

CONNECTING

HEADPHONES

To reduce distractions or help you

hear weak signals, you can use your

CB with monaural headphones that

have a 1/4-inch plug and an imped-

ance of 4, 8, 16, or 100 ohms. Plug

the headphones' plug into the

PHONES jack on the front of your

CB.

Note: Plugging in headphones si-

lences both the internal and external

speakers.

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OPERATION

Caution: Do not use your CB before

you connect it to an antenna.

Before you start using your CB, you

should know how to use it effectively

and courteously. See “CB Courtesy”

and “Using 10-Codes.”

RECEIVING

TRANSMISSIONS

Note: You must connect the micro-

phone to your CB or it will not re-

ceive.

1. Set

VOLUME to MIN.

2. To turn on the CB, press

POWER to the  position. The

CHANNEL display shows the

last channel used.

3. Turn RF GAIN to HIGH (fully

clockwise).

4. Turn SQUELCH to MIN (fully

counterclockwise) so you can

hear background noise (hiss).

5. Adjust VOLUME to a comfort-

able listening level.

6. Rotate CHANNEL to the right to

increase the channel number, or

to the left to decrease the chan-

nel number. The SIGNAL meter

shows the strength of the incom-

ing signal.

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7. Slowly turn SQUELCH to the

right until the background hiss

disappears.

Notes:

• Do not set SQUELCH too far

to the right, or you cannot

hear weak signals.

• To receive very weak signals,

turn SQUELCH to the left.

You hear noise between

transmissions, but you also

hear weak signals (those not

strong enough to completely

break through the squelch).

8. Adjust VOLUME again to a com-

fortable listening level.

TRANSMITTING

Note: We recommend you try receiv-

ing before you begin transmitting.

1. Rotate CHANNEL to select a

channel.

2. Hold the microphone about 3

inches from your mouth. Press

and hold the microphone's talk

button and speak in a normal

voice.

The TX POWER meter shows

the strength of the transmitting

signal.

The microphone automatically

adjusts its gain to provide the

best modulation. However,

speaking very loudly or very

softly can still cause unwanted

noise or distortion.

3. Release the talk button when

you finish speaking.

4. When you are finished, turn off

the power by pressing POWER

to the m position.

USING SPECIAL

CONTROLS

Your CB features several special

controls. We suggest you learn about

these controls so you can fully enjoy

your CB.

21-1579.fm Page 10 Thursday, August 5, 1999 9:34 AM

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