Radio Shack TRC-446 Bedienungsanleitung

Cat. No. 21-1574

OWNER’S MANUAL

Please read before using this equipment.

TRC-446

Deluxe 4 Watt 40-Channel

Mobile CB Radio

with Weather Alert and ACE

21-1574.fm Page 1 Thursday, May 13, 1999 4:03 PM

FEATURES

Your RadioShack TRC-446 Deluxe 40-

Channel Mobile CB Radio with Weather

Alert is a high performance CB that also

lets you tune to local and national

weather service broadcasts. This CB is

perfect for recreational, business, or

emergency use. You can call other peo-

ple who have CBs at home, in their vehi-

cles, or at camp sites. You can also

connect optional equipment to your CB,

such as an external speaker which cre-

ates a PA system; or a DC power supply

and base station antenna to use it as a

base station in your home.

Your CB has these features:

ACE (Audio Clarity Enhancer) — sup-

presses noise levels while leaving the

signal intact during reception. During

transmitting, it enhances the signal, pro-

viding you with a significant reduction in

reception and transmission noise.

NOAA 7-Channel WX Band Receiver

— lets you tune to seven national

weather service frequencies which pro-

vide local weather conditions and fore-

casts.

WX/Alert Indicator — shows the CB is

ready to receive and indicates the re-

ception of a weather alert

Built-In SWR Meter — helps you tune

your antenna system to optimize your

CB's performance.

RF Gain Control — lets you adjust re-

ception to match the strength of the re-

ceived signal.

Convenient On-Microphone Channel

Up/Down Controls — let you quickly

scan the band for communications.

CH-9/NOR/CH-19 Switch — lets you

quickly tune to emergency Channel 9 or

Channel 19 without using the rotary tun-

ing control.

Screw-On Microphone Connector —

ensures rugged operation and long life.

PLL (Phase-Locked Loop) Frequency

Synthesizer — uses a precise frequen-

cy reference crystal to provide reliable

and exact tuning.

Two Ceramic Filters — provide superi-

or channel selectivity and prevent adja-

cent-channel interference.

Specialized Squelch Circuit — com-

pensates for fading signals and elimi-

nates signal chopping during reception.

Last-Channel Memory — tunes to the

last selected channel each time you turn

on the radio.

Lighted SWR/RF/Signal Meter — dis-

plays the signal strength and the stand-

ing wave ratio (SWR).

Digital Channel Display — makes the

selected channel easy to see.

RadioShack is a registered trademark used by Tandy Corporation.

21-1574.fm Page 2 Thursday, May 13, 1999 4:03 PM

Noise Blanking — reduces the noise

occasionally generated by nearby elec-

trical motors or automotive ignition sys-

tems.

CB/WX/PA Switch — lets you quickly

select among normal CB operation,

weather mode, or public address mode.

RX/TX Indicator — shows whether the

CB is transmitting or receiving.

S/RF/SWR/CAL Switch — lets you

quickly change the display of the RF/

Signal Meter to show radio input/output

signal strength, the standing wave ratio

of the antenna, or SWR calibration data.

Universal Mounting Bracket — lets

you mount your CB securely in your ve-

hicle.

Note: To use this CB, you need a mo-

bile or base station antenna (not sup-

plied). Your local RadioShack store has

a wide variety of antennas. For more in-

formation, see “Installing an Antenna”

on Page 7.

We recommend you record your CB's

serial number here. The number is on

the CB's back panel.

Serial Number__________________

FCC INFORMATION

The Federal Communications Commis-

sion (FCC) does not require you to have

a license to operate this CB. However,

the FCC does require that you read and

know Part 95 of

FCC Rules

. These rules

apply to the operation of a Class D CB.

We have provided a copy of these regu-

lations with your CB.

Warning: Do not open your CB to make

any internal adjustments. Any internal

adjustments can be made only by an au-

thorized service technician.

Unauthorized internal adjustments and/

or modifications can lead to illegal oper-

ation as defined by Part 95 of FCC

Rules. Such illegal operation can lead to

very serious consequences. To be safe

and sure:

• Never open your CB's case.

• Never modify your CB.

Your CB might cause TV or radio inter-

ference even when it is operating prop-

erly. To determine whether your CB is

causing the interference, turn off your

CB. If the interference goes away, your

CB is causing it. Try to eliminate the in-

terference by either moving your CB

away from the receiver or contacting

your local RadioShack store for help. If

you cannot eliminate the interference,

the FCC requires that you stop using

your CB.

21-1574.fm Page 3 Thursday, May 13, 1999 4:03 PM

CONTENTS

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

Mounting the TRC-446 ....................................................................................... 5

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

Installing an Antenna .......................................................................................... 7

Selecting an Antenna ................................................................................... 7

Connecting an Antenna ............................................................................... 7

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

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

Connecting Optional External Speakers ............................................................. 8

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

Public Address Speaker ............................................................................... 9

Adjusting the Standing Wave Ratio .................................................................... 9

Standing Wave Ratio Guidelines ...................................................................... 10

Standing Wave Ratio Performance ............................................................ 10

A Quick Look at the Controls ............................................................................... 11

Operation ............................................................................................................... 12

Changing Channels Using the Controls on the Microphone ............................. 13

Listening to Weather Broadcasts ...................................................................... 13

Weather Alert .................................................................................................... 14

Using the Public Address Function ................................................................... 14

CB Operation Tips ................................................................................................ 15

Business Uses .................................................................................................. 15

Personal Uses .................................................................................................. 15

CB Courtesy ..................................................................................................... 15

Using Common 10-Codes .................................................................................... 16

Maximum Range .............................................................................................. 17

Troubleshooting .................................................................................................... 18

Care and Maintenance .......................................................................................... 19

Specifications ........................................................................................................ 21

21-1574.fm Page 4 Thursday, May 13, 1999 4:03 PM

INSTALLATION

MOUNTING THE

MICROPHONE HOLDER

Using a Philips screwdriver and the sup-

plied screw and washers, attach the

supplied microphone holder to the CB's

left or right side, either horizontally or

vertically (depending on how you plan to

use it).

MOUNTING THE TRC-446

The most common mounting location for

this CB is under a vehicle’s dashboard.

If you use the TRC-446 as a base sta-

tion, you can place it on a desk, shelf, or

table (See “Using the CB as a Base Sta-

tion” on Page 8).

When mounting the CB in a vehicle,

choose a location where:

• you can easily reach the CB

• wires and cables are routed away

from the vehicle's pedals or other

moving parts

• all wires and cables can reach their

connection points

• the CB is not directly in front of heat-

ing vents

Cautions:

• If you use the TRC-446 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 proper

operation of any passive restraint

safety device (an air bag or seat

belt).

Follow these steps to mount the CB us-

ing the supplied hardware.

1. Select a location that provides

secure mounting.

Caution: Be careful not to drill into

anything behind the mounting sur-

face.

2. Using the slots in the mounting

bracket as a template, mark the

positions for the screw holes.

3. In each marked location, drill a hole

slightly smaller than the supplied

mounting screws.

CH-19

TRC-446

WX/ALERT

WEATHER

RF GAIN

SWR CAL

SQUELCH

VOLUME

MIC

TX/RX

S/RF CB NB ACE

CH-9

CAL PA OFF OFF

CH-19

TRC-446

WX/ALERT

WEATHER

RFGAIN

SWRCAL

SQUELCH

VOLUME

MIC

TX/RX

S/RFCBNBACE

CH-9

CALPA OFFOFF

LOCK

CHANNEL

DOWN

21-1574.fm Page 5 Thursday, May 13, 1999 4:03 PM

4. Using a Phillips screwdriver, attach

the mounting bracket to the mount-

ing surface with the supplied large

mounting screw and star lock wash-

ers.

5. Attach the CB to the mounting

bracket using the supplied rubber

washers and mounting knobs.

CONNECTING THE

MICROPHONE

1. Align the slot on the top of the

microphone plug with the ridge

inside the MIC jack, then fully insert

the plug into the jack.

2. Secure the plug by turning the plug's

locking nut clockwise.

3. Slide the microphone onto the

microphone holder.

To disconnect the microphone, unscrew

the locking nut and gently pull out the

microphone plug.

Caution: Always grasp the connector

body when you are disconnecting the

microphone. Never pull on the micro-

phone cable.

ANTENNA

PA SP

POWER

+ 13.8V DC -

EXT SP

A DIVISION OF TANDY CORPORATION

CUSTOM MANUFACTURED IN THAILAND

FORT WORTH, TEXAS 76102

CAT NO.: 21-1574 TRC-446

SERIAL NO.: 0000001

FOR RADIOSHACK,

FCC ID: AAO21-1574

ANTENNA

POWER

13.8V DC

PA SP EXT SP

13.8 DC Power Supply

Base Station Power Setup

21-1574.fm Page 6 Thursday, May 13, 1999 4:03 PM

INSTALLING AN

ANTENNA

Caution: To prevent damage to your

CB, do not attempt to transmit without

an antenna attached.

Selecting an Antenna

When you decide on an antenna and its

location, consider these points:

• The antenna should be positioned

as high as possible.

• The antenna and the antenna cable

should be routed as far as possible

from any source of electrical noise

such as ignition systems, electric

gauges, and motors.

Your local RadioShack store sells a vari-

ety of CB antennas for both mobile and

base-station use. Choose the one that

best meets your needs.

Connecting an Antenna

Follow the mounting instructions sup-

plied with the antenna you choose.

Route the antenna cable to the CB, then

thread the PL-259 antenna cable plug

into

ANTENNA on the back of the CB.

Cautions:

• Do not run the cable over sharp

edges or moving parts that might

damage it.

• Do not run the cable next to power

cables or other CB antenna cables.

• Do not run the cable through a vehi-

cle's engine compartment or other

areas that produce extreme heat.

USING VEHICLE

BATTERY POWER

You can power this CB from your vehi-

cle's battery or from standard AC power

with an optional DC power supply. For in-

formation on using AC power, see “Using

the CB as a Base Station” on Page 8.

Follow these steps to power the CB from

your vehicle's battery.

1. Plug the single-connector end of the

power cord into POWER 13.8V DC

on the CB's back panel.

2. Connect the black wire to your vehi-

cle’s negative (–) battery terminal or

to a metal part of the vehicle's frame

that is not insulated from the frame

by a plastic part.

3. Connect the red wire, with its 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.

This assures you that power to the

CB is turned off when you turn off

the ignition.

4. Connect the orange wire, with its in-

line fuse, to a source of voltage that

supplies constant positive (+) power

(regardless of the ignition switches

position) or directly to your vehicle's

positive (+) battery terminal. This

enables the radio to “remember” the

last channel you tuned to when you

turn the radio back on.

21-1574.fm Page 7 Thursday, May 13, 1999 4:03 PM

USING THE CB AS A

BASE STATION

Although this CB is designed for mobile

use, you can also use it as a base sta-

tion. For base-station installation, you

need a regulated 12-volt DC power sup-

ply, such as Cat. No. 22-504 available at

your local RadioShack store.

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 included

with the power supply.

You also need a base station antenna

and coaxial antenna cable and connec-

tors. Your local RadioShack store also

carries a wide selection of suitable an-

tennas, cables, and connectors.

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 the 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. Route the antenna cable to the CB,

then connect the cable to

ANTENNA on the back of the CB.

3. Plug the single connector end of the

power cord into POWER 13.8V DC

on the CB's back panel.

4. Connect the black wire to the DC

power supply's negative (–) termi-

nal.

5. Connect the red wire and orange

wires, with in-line fuses, to the DC

power supply's positive (+) terminal.

Note: Due to the lack of a constant

12VDC, as in an automotive installation,

if you turn off the DC power supply, the

CB “remembers” the last channel you

tuned for only a few minutes. When you

turn on the CB and the DC power supply

again, the radio automatically tunes to

Channel 9.

CONNECTING OPTIONAL

EXTERNAL SPEAKERS

You can connect an external CB or PA

speaker to your CB. The larger, external

speaker provides greater clarity. A PA

speaker lets you take advantage of the

amplifier and mic to use the CB as a

public-address system.

External CB Speaker

To connect an external CB speaker,

use a speaker rated at 8-ohms and ca-

pable of handling 3–10 watts of power

(such as Cat. No. 21-549). Simply plug

the speaker cable's 1/8-inch plug into

EXT SP. Connecting the external speak-

er automatically disconnects the inter-

nal speaker.

21-1574.fm Page 8 Thursday, May 13, 1999 4:03 PM

Public Address Speaker

To connect a PA speaker to the CB, use

an 8-ohm speaker capable of handling 5

or more watts of power and equipped

with an 1/8-inch connector on the cable.

Contact your local RadioShack store

for a selection of suitable speakers.

Plug into PA SP. See “Using the Public

Address Function” on Page 14 for oper-

ation instructions.

ADJUSTING THE

STANDING WAVE RATIO

Most antennas are factory adjusted.

However, you can usually improve per-

formance by matching the characteris-

tics of your antenna system to the CB's

RF output power using the built-in SWR

meter. The impedance of a CB’s output

compared to the impedance of the an-

tenna and the antenna cable is typically

slightly mismatched. By adjusting this

impedance ratio to be as close to 1:1 as

possible, you maximize the efficiency of

your system.

After you have properly installed the an-

tenna and routed its cable, follow these

steps to adjust the standing wave ratio

Note: The SWR on some mobile and

base-station antennas cannot be

changed.

1. Turn on the CB by turning OFF/VOL-

UME clockwise until it clicks.

2. Set S/RF/SWR/CAL to CAL.

3. Hold down the microphone's talk

button and adjust SWR CAL so the

SWR/RF signal meter's needle

points to CAL on the upper SWR

scale.

4. Release the microphone's talk but-

ton.

5. Set S/RF/SWR/CAL to SWR.

6. Press the microphone's talk button

again and note the actual SWR

measurement on the upper SWR

scale. See the chart on Page 10 for

help in interpreting the SWR meter

readings.

The SWR value takes into account the

actual frequency of the RF signal trans-

mitted. Therefore, you will get a different

SWR reading from one CB channel to

another. Almost all the CB transmis-

sions usually fall within an acceptable

range. However, for optimum radio per-

formance, we recommend that you fine

tune the antenna's system based on the

channel you use most. If you have no

particular channel preference, set your

antenna's SWR for maximum perfor-

mance on Channel 19.

21-1574.fm Page 9 Thursday, May 13, 1999 4:03 PM

STANDING WAVE RATIO GUIDELINES

The ideal standing wave ratio (SWR) is 1:1, or a meter reading of 1 on the SWR

meter's top scale. This reading, however, can only be obtained under laboratory con-

ditions. A SWR ratio of 1.5:1 to 2:1 is excellent for most mobile CB antenna applica-

tions. This chart helps you interpret the different readings you might see.

Standing Wave Ratio Performance

Prolonged exposure to salt spray, humidity, weather-induced corrosion, or vehicle vi-

bration can cause antenna performance to degrade with a subsequent rise in the

SWR. Anytime you notice that the SWR reading is greater than 3:1, check the condi-

tion of the antenna, the antenna cable and all antenna connectors and hardware.

Ratio Rating Evaluation

1:1 – 1.5:1 Superior Perfect match between the an-

tenna/cable and the RF output of

the CB.

1.5:1 – 2:1 Excellent The antenna/cable system is an

outstanding match to the trans-

mitter’s RF output. Ideal for most

CB installations.

2:1 – 3:1 Good The antenna/cable system will

perform to specification under

most normal conditions.

Higher than

3.1:1 Inefficient Indicates a need to inspect the

system, the mounting of the

antenna and all pertinent hard-

ware.

21-1574.fm Page 10 Thursday, May 13, 1999 4:03 PM

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