Radio Shack TRC-504 User manual

Cat. No. 21-1704

OWNER’S MANUAL

Please read before using this equipment.

TRC-504

40-Channel Mobile CB Radio

with On-Mic Channel Selector

21-1704.fm Page 1 Thursday, August 5, 1999 1:20 PM

FEATURES

RadioShack and Powerhorn are registered trademarks used by Tandy Corporation.

Your RadioShack TRC-504 Compact

40-Channel Mobile CB Radio is a break-

through in CB design technology. You

can mount it in a vehicle for mobile use,

or in your home for use as a base sta-

tion.

Your CB has these advanced features:

Dual Channel Controls — let you tune

the channel from the transceiver or the

handset.

RF Gain Control — lets you adjust the

receiver’s gain to match the strength of

the signal.

Emer

enc

Channel Switch — lets

you quickly switch to Channel 9 or 19 so

you can monitor or report emergency sit-

uations.

Two-Di

it Channel Displa

with TX

(Transmit) and RX (Receive) Indica-

tors — lets you see the CB’s operating

status at a glance.

External Speaker Jack — lets you con-

nect your CB to an external speaker.

Built-In PA (Public Address) Amplifier

— lets you use your CB as a public ad-

dress system when you add an optional

PA speaker.

Backlit Controls — help you easily find

the right control when you use the CB at

night.

Phase-Locked Loop (PLL) Frequenc

nthesizer — provides highly accurate

and stable tuning.

Two Built-In Ceramic Filters — ensure

superior channel selectivity and freedom

from adjacent channel interference.

Automatic Modulation Control — pre-

vents the transmitter signal from over-

modulating and distorting.

Automatic Noise Limiter — reduces

impulse-type noises while receiving.

Universal Mountin

Bracket — lets

you mount your CB securely in your ve-

hicle or on a table or shelf in your home.

Note: To use this CB, you must connect

a mobile or base station antenna. Your

local RadioShack store has a wide vari-

ety of antennas. For more information,

see “Connecting an Antenna” on Page

We recommend you record your CB’s

serial number here. The number is on

the CB’s bottom cabinet.

Serial Number _________________

21-1704.fm Page 2 Thursday, August 5, 1999 1:20 PM

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

. It explains the proper operation of

a Class D citizen’s band transceiver. We

enclosed a copy of Part 95 with your CB

radio.

Warning: Do not open the 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 case.

• 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 radio is causing it. Try to

eliminate the interference by:

• moving your CB radio away from the

receiver

• contacting your local RadioShack

store for help

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.

21-1704.fm Page 3 Thursday, August 5, 1999 1:20 PM

CONTENTS

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

Attaching the Microphone Holder ....................................................................... 5

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

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

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

External Speaker ................................................................................................ 8

Connecting a CB Speaker ........................................................................... 8

Connecting a PA Speaker ............................................................................ 8

Using Vehicle Battery Power .............................................................................. 9

Using the Transceiver as a Base Station ............................................................ 9

Operation ............................................................................................................... 11

Receiving Transmissions and Adjusting Squelch ............................................. 11

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

Selecting the Emergency Channel ................................................................... 12

Using the PA Amplifier ...................................................................................... 12

Using the Monitor Feature ................................................................................ 13

Operational Hints .................................................................................................. 14

Common Uses for a CB .................................................................................... 14

Personal Uses ............................................................................................ 14

Business Uses ........................................................................................... 14

Transmission Courtesy ..................................................................................... 14

Using Common 10-Codes ................................................................................ 15

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

Troubleshootin

.................................................................................................... 17

Reducing Noise ................................................................................................ 19

Care and Maintenance .......................................................................................... 20

Replacing the Fuse ........................................................................................... 21

Specifications ........................................................................................................ 22

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INSTALLATION

ATTACHING THE

MICROPHONE HOLDER

You can attach the microphone holder to

either side of the transceiver or to anoth-

er location in your vehicle.

To attach the holder to the transceiver,

secure the holder to either side using

the supplied 3 mm screws and lock

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.

Caution: Be careful not to drill into

anything behind the mounting sur-

face.

3. Attach the holder at the mounting

location using the supplied machine

screws, spring washers, plain wash-

ers, and nuts.

Note: If you cannot reach behind

the mounting surface to attach the

nuts on the machine screws, use

the supplied 3 mm plain washers

and self-tapping screws.

MOUNTING THE

TRANSCEIVER

The most common mounting location for

this CB is under a vehicle’s dashboard.

However, if you plan to use the TRC-

504 as a base station, you can place it

on a desk, shelf, or table (see “Using the

Transceiver as a Base Station” on Page

9).

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.

21-1704.fm Page 5 Thursday, August 5, 1999 1:20 PM

Cautions:

• If you use the CB in a vehicle,

mount it securely to avoid damage

to the CB or vehicle or injury to any-

one in the vehicle during sudden

starts or stops.

• Do not mount the CB where it could

damage or interfere with the opera-

tion of any passive restraint safety

device (an airbag or seat belt).

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 supplied

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 supplied 5 mm

bolts, spring washers, plain wash-

ers, and nuts.

Note: If you cannot reach behind

the mounting surface to attach the

nuts on the bolts, use the supplied 5

mm self-tapping screws and plain

washers to secure the bracket.

4. Attach the CB to the mounting

bracket using the supplied rubber

washers and mounting knobs.

CONNECTING AN

ANTENNA

There are many different types of CB

antennas for mobile CBs. Each type has

its own benefits, so choose the one that

best meets your needs. Your local Ra-

dioShack store sells a wide variety of

antennas.

Note: If you are using this CB as a base

station, see “Using the Transceiver as a

Base Station” on Page 9.

21-1704.fm Page 6 Thursday, August 5, 1999 1:20 PM

When you choose an antenna, keep in

mind that, for the best performance, you

should mount the antenna:

• as high as possible on the vehicle

• as far as possible from sources of

electrical noise

• vertically

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.

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 the

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 (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 general-

ly acceptable, with readings of 1.5:1 or

lower being more desirable.

CONNECTING THE

MICROPHONE

1. Align the tab on the side of the sup-

plied microphone’s plug with the

notch in the microphone jack (on the

side of the transceiver). Then insert

the plug into the jack.

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: Never pull on the microphone

cable.

21-1704.fm Page 7 Thursday, August 5, 1999 1:20 PM

CONNECTING AN

EXTERNAL SPEAKER

You can connect your transceiver to an

external CB speaker, so you can hear

an incoming call when you are outside

your vehicle, or use the CB as a PA sys-

tem.

Connecting a CB Speaker

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 (such as RadioShack

Cat. No. 21-549). The speaker cable

must have a 1/8-inch plug.

To connect the external speaker to the

transceiver, insert the speaker cable’s

plug into EXT SPEAKER on the back of

the CB.

Note: When you connect an external

speaker, the CB’s internal speaker dis-

connects.

Connecting a PA Speaker

The PA speaker should:

• have an impedance of 8 ohms

• be able to handle at least 5 watts of

power (the RadioShack Power-

horn®series speakers meet this

requirement)

• have a cable with a 1/8-inch plug

If your PA speaker meets the other

specifications but does not already have

a 1/8-inch plug, you can connect it using

a phono plug-to-wire cable, available at

your local RadioShack store.

To connect the PA speaker to the trans-

ceiver, insert the speaker cable’s plug

into

PA SPEAKER on the back of the CB.

Note: To avoid acoustic feedback, the

speaker should be at least 6 feet from

the CB. If you experience feedback,

avoid keying the microphone until you

have moved the speaker away from the

CB.

To External

Speaker

To External

PA Speaker

21-1704.fm Page 8 Thursday, August 5, 1999 1:20 PM

USING VEHICLE BATTERY

POWER

Follow these steps to connect the trans-

ceiver to vehicle battery power.

1. Connect the red wire (with the in-

line fuse holder) on the back of the

transceiver to a point in your vehi-

cle’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 AS A

BASE STATION

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:

• 12-volt DC power supply that can

supply at least 2 amps (such as Cat.

No. 22-504)

Caution: Most 12-volt DC power

supplies 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 included with the power

supply.

• base station antenna (such as Cat.

No. 21-969)

• coaxial antenna cable and connec-

tors, available at your local

RadioShack store

Black Wire

to Ground

Red Wire to

Switched

Accessory

Terminal

21-1704.fm Page 9 Thursday, August 5, 1999 1:20 PM

Caution: To prevent damage to the CB,

be sure you connect an antenna and the

microphone before you use the CB.

Follow these steps to install the CB as a

base station.

1. Mount the base station antenna as

described in its owner’s manual.

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!

2. Connect the antenna to ANTENNA

on the back of the CB.

3. Connect the transceiver’s black

power wire to the negative (–) termi-

nal on the DC power supply.

4. Connect the transceiver’s red wire

(with the in-line fuse) to the positive

(+) terminal on the DC power sup-

ply.

5. Connect the DC power supply to a

standard AC outlet.

Black Wire

to Negative

Terminal of

DC Power

Supply

Red Wire

to Positive

Terminal of

Supply

DC Power

Antenna

21-1704.fm Page 10 Thursday, August 5, 1999 1:20 PM

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