Radio Shack Portable Radio TRC 494 User Guide

21-1589.fm Page 1 Thursday, August 5, 1999 10:10 AM  
Cat. No. 21-1589  
OWNER’S MANUAL  
Please read before using this equipment.  
TRC-494  
40-Channel Emergency  
Citizen’s Band Weatheradio  
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INTRODUCTION  
Your Radio Shack TRC-494 is a 40-  
channel emergency citizen’s band  
weatheradio that is specially de-  
signed for emergency situations. It  
comes with a handy carrying case so  
you can easily move it from one vehi-  
cle to another. And, the TRC-494 is  
also a 3-channel weatheradio, which  
you can use to receive weather infor-  
mation 24 hours a day.  
Range Control — lets you eliminate  
background noise when no strong  
signals are present.  
Built-In Ceramic Filters — provide  
superior selectivity and prevent adja-  
cent-channel interference.  
Built-In Automatic Noise Limiter  
(ANL) — reduces noise caused by  
nearby electrical equipment, such as  
motors or automotive ignition sys-  
tems.  
You can power the TRC-494 from the  
cigarette-lighter socket in any vehicle  
that has a 12-volt, negative ground  
electrical system. You can also pow-  
er the CB from the supplied battery  
pack.  
External Antenna Jack — lets you  
connect the TRC-494 to an external  
CB radio antenna.  
Its features include:  
Note: The TRC-494 comes with a  
telescoping antenna that you can at-  
tach directly to the CB. You can also  
attach it to the supplied magnet-  
mount base for use when your vehi-  
cle is not moving. If you plan to use  
the CB when your vehicle is moving,  
we recommend that you purchase a  
standard mount antenna.  
CB/Weatheradio Switch — lets you  
quickly switch from the CB to the  
weatheradio function.  
Emergency Channel 9 Switch —  
immediately switches the CB to  
Channel 9, the universal emergency  
channel.  
Important: REACT is a  
PLL (Phase-Locked Loop) Fre-  
quency Synthesizer — provides re-  
liable and exact tuning using a  
frequency reference crystal.  
nationwide 24-hour net-  
work  
that  
monitors  
Channel 9. Switch to  
Channel 9 in an emer-  
gency, and report the  
problem.  
Digital Channel-Number Display  
— makes it easy to see which chan-  
nel is selected.  
Note: REACT might not be available  
in all areas.  
© 1996 Tandy Corporation.  
All Rights Reserved.  
Radio Shack is a registered trademark used by Tandy Corporation.  
2
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21-1589.fm Page 2 Thursday, August 5, 1999 10:10 AM  
INTRODUCTION  
Your Radio Shack TRC-494 is a 40-  
channel emergency citizen’s band  
weatheradio that is specially de-  
signed for emergency situations. It  
comes with a handy carrying case so  
you can easily move it from one vehi-  
cle to another. And, the TRC-494 is  
also a 3-channel weatheradio, which  
you can use to receive weather infor-  
mation 24 hours a day.  
Range Control — lets you eliminate  
background noise when no strong  
signals are present.  
Built-In Ceramic Filters — provide  
superior selectivity and prevent adja-  
cent-channel interference.  
Built-In Automatic Noise Limiter  
(ANL) — reduces noise caused by  
nearby electrical equipment, such as  
motors or automotive ignition sys-  
tems.  
You can power the TRC-494 from the  
cigarette-lighter socket in any vehicle  
that has a 12-volt, negative ground  
electrical system. You can also pow-  
er the CB from the supplied battery  
pack.  
External Antenna Jack — lets you  
connect the TRC-494 to an external  
CB radio antenna.  
Its features include:  
Note: The TRC-494 comes with a  
telescoping antenna that you can at-  
tach directly to the CB. You can also  
attach it to the supplied magnet-  
mount base for use when your vehi-  
cle is not moving. If you plan to use  
the CB when your vehicle is moving,  
we recommend that you purchase a  
standard mount antenna.  
CB/Weatheradio Switch — lets you  
quickly switch from the CB to the  
weatheradio function.  
Emergency Channel 9 Switch —  
immediately switches the CB to  
Channel 9, the universal emergency  
channel.  
Important: REACT is a  
PLL (Phase-Locked Loop) Fre-  
quency Synthesizer — provides re-  
liable and exact tuning using a  
frequency reference crystal.  
nationwide 24-hour net-  
work  
that  
monitors  
Channel 9. Switch to  
Channel 9 in an emer-  
gency, and report the  
problem.  
Digital Channel-Number Display  
— makes it easy to see which chan-  
nel is selected.  
Note: REACT might not be available  
in all areas.  
© 1996 Tandy Corporation.  
All Rights Reserved.  
Radio Shack is a registered trademark used by Tandy Corporation.  
2
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21-1589.fm Page 3 Thursday, August 5, 1999 10:10 AM  
For your records, we urge you to  
record your CB’s serial number in the  
space below. The serial number is on  
the CB’s back panel.  
Your CB might cause TV or radio in-  
terference even when it is operating  
properly. To determine if your CB is  
causing the interference, turn off  
your CB. If the interference goes  
away, your CB is causing it. Try to  
eliminate the interference by:  
Serial Number:_________________  
• Moving your CB away from the  
receiver.  
FCC INFORMATION  
• Contacting your local Radio  
Shack store for help.  
The Federal Communications Com-  
mission (FCC) does not require you  
to have a license to operate this CB.  
However, the FCC does require you  
to read and know Part 95 of FCC  
Rules. These rules apply to the oper-  
ation of a Class D CB. We have pro-  
vided a copy of these regulations  
with your CB.  
If you cannot eliminate the interfer-  
ence, the FCC requires that you stop  
using your CB.  
Warning: Do not open your CB to  
make any internal adjustments. Inter-  
nal adjustments can be made only by  
authorized service personnel.  
Internal adjustments and/or modifi-  
cations can lead to illegal operation  
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.  
3
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21-1589.fm Page 3 Thursday, August 5, 1999 10:10 AM  
For your records, we urge you to  
record your CB’s serial number in the  
space below. The serial number is on  
the CB’s back panel.  
Your CB might cause TV or radio in-  
terference even when it is operating  
properly. To determine if your CB is  
causing the interference, turn off  
your CB. If the interference goes  
away, your CB is causing it. Try to  
eliminate the interference by:  
Serial Number:_________________  
• Moving your CB away from the  
receiver.  
FCC INFORMATION  
• Contacting your local Radio  
Shack store for help.  
The Federal Communications Com-  
mission (FCC) does not require you  
to have a license to operate this CB.  
However, the FCC does require you  
to read and know Part 95 of FCC  
Rules. These rules apply to the oper-  
ation of a Class D CB. We have pro-  
vided a copy of these regulations  
with your CB.  
If you cannot eliminate the interfer-  
ence, the FCC requires that you stop  
using your CB.  
Warning: Do not open your CB to  
make any internal adjustments. Inter-  
nal adjustments can be made only by  
authorized service personnel.  
Internal adjustments and/or modifi-  
cations can lead to illegal operation  
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.  
3
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21-1589.fm Page 4 Thursday, August 5, 1999 10:10 AM  
CONTENTS  
PREPARATION ............................................................................................... 5  
Supplying Power......................................................................................... 5  
Using Vehicle Battery Power ............................................................... 5  
Installing the Battery Pack .................................................................. 5  
Attaching the Antenna ................................................................................ 6  
Attaching the Antenna Directly to the CB ............................................ 6  
Using the Antenna’s Magnetic Base ................................................... 7  
USING THE CB ............................................................................................... 8  
Setting RANGE............................................................................................ 9  
USING THE WEATHERADIO ........................................................................ 10  
CB OPERATION TIPS .................................................................................... 11  
Common Uses for a CB Radio .................................................................. 11  
Business Uses ................................................................................... 11  
Personal Uses .................................................................................... 11  
CB Courtesy ............................................................................................. 12  
Maximum Range ...................................................................................... 12  
Using Common 10-Codes ........................................................................ 13  
TROUBLESHOOTING .................................................................................. 14  
Reducing Noise ........................................................................................ 15  
MAINTENANCE ............................................................................................ 16  
Replacing the Power Cord’s Fuse ............................................................ 17  
SPECIFICATIONS ......................................................................................... 18  
4
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21-1589.fm Page 4 Thursday, August 5, 1999 10:10 AM  
CONTENTS  
PREPARATION ............................................................................................... 5  
Supplying Power......................................................................................... 5  
Using Vehicle Battery Power ............................................................... 5  
Installing the Battery Pack .................................................................. 5  
Attaching the Antenna ................................................................................ 6  
Attaching the Antenna Directly to the CB ............................................ 6  
Using the Antenna’s Magnetic Base ................................................... 7  
USING THE CB ............................................................................................... 8  
Setting RANGE............................................................................................ 9  
USING THE WEATHERADIO ........................................................................ 10  
CB OPERATION TIPS .................................................................................... 11  
Common Uses for a CB Radio .................................................................. 11  
Business Uses ................................................................................... 11  
Personal Uses .................................................................................... 11  
CB Courtesy ............................................................................................. 12  
Maximum Range ...................................................................................... 12  
Using Common 10-Codes ........................................................................ 13  
TROUBLESHOOTING .................................................................................. 14  
Reducing Noise ........................................................................................ 15  
MAINTENANCE ............................................................................................ 16  
Replacing the Power Cord’s Fuse ............................................................ 17  
SPECIFICATIONS ......................................................................................... 18  
4
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21-1589.fm Page 5 Thursday, August 5, 1999 10:10 AM  
PREPARATION  
Installing the Battery Pack  
SUPPLYING POWER  
Your CB uses eight AA batteries for  
power. For the best performance and  
longest life, we recommend alkaline  
batteries, such as Radio Shack Cat.  
No. 23-552.  
Using Vehicle Battery Power  
Follow these steps to power the CB  
from your vehicle’s battery.  
1. Plug the small end of the sup-  
plied power cord into DC 12V on  
the side of the CB.  
Note: When you connect the DC  
power cord to the CB, the battery  
pack automatically disconnects.  
Follow these steps to install the bat-  
teries in the battery pack and attach  
the battery pack to the CB.  
1. Press down and slide the battery  
pack’s latch in the direction of  
the arrow. While holding the  
latch, slide the battery pack off  
to the right.  
Caution: Before plugging the  
power cord’s cigarette-lighter  
plug into your vehicle’s ciga-  
rette-lighter socket, make sure  
the tip is screwed firmly onto the  
plug (see “Replacing the Power  
Cord’s Fuse” on Page 17).  
2. Plug the other end of the power  
cord into the cigarette-lighter  
socket.  
2. Push down on the center of the  
battery pack’s top to remove the  
battery holder from the battery  
pack case.  
Notes:  
• If the CB does not operate prop-  
erly when you are using the DC  
power cord, check that the  
lighter socket is clean and free  
of ashes or other debris.  
• If the unit still does not work,  
check the fuse in the DC power  
cord (see “Replacing the Power  
Cord’s Fuse” on Page 17).  
5
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21-1589.fm Page 5 Thursday, August 5, 1999 10:10 AM  
PREPARATION  
Installing the Battery Pack  
SUPPLYING POWER  
Your CB uses eight AA batteries for  
power. For the best performance and  
longest life, we recommend alkaline  
batteries, such as Radio Shack Cat.  
No. 23-552.  
Using Vehicle Battery Power  
Follow these steps to power the CB  
from your vehicle’s battery.  
1. Plug the small end of the sup-  
plied power cord into DC 12V on  
the side of the CB.  
Note: When you connect the DC  
power cord to the CB, the battery  
pack automatically disconnects.  
Follow these steps to install the bat-  
teries in the battery pack and attach  
the battery pack to the CB.  
1. Press down and slide the battery  
pack’s latch in the direction of  
the arrow. While holding the  
latch, slide the battery pack off  
to the right.  
Caution: Before plugging the  
power cord’s cigarette-lighter  
plug into your vehicle’s ciga-  
rette-lighter socket, make sure  
the tip is screwed firmly onto the  
plug (see “Replacing the Power  
Cord’s Fuse” on Page 17).  
2. Plug the other end of the power  
cord into the cigarette-lighter  
socket.  
2. Push down on the center of the  
battery pack’s top to remove the  
battery holder from the battery  
pack case.  
Notes:  
• If the CB does not operate prop-  
erly when you are using the DC  
power cord, check that the  
lighter socket is clean and free  
of ashes or other debris.  
• If the unit still does not work,  
check the fuse in the DC power  
cord (see “Replacing the Power  
Cord’s Fuse” on Page 17).  
5
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21-1589.fm Page 6 Thursday, August 5, 1999 10:10 AM  
3. Install the batteries in the holder  
as indicated by the polarity sym-  
bols (+ and –) marked on the  
holder.  
ATTACHING THE  
ANTENNA  
You can attach the supplied tele-  
scoping antenna to the supplied  
magnetic base or directly to the CB.  
In either case, fully extend the anten-  
na for maximum range.  
Attaching the Antenna  
Directly to the CB  
4. Slide the battery pack’s case  
over the holder until it snaps into  
place.  
To attach the antenna directly to the  
CB, simply screw the antenna into  
ROD ANT  
the CB’s  
jack.  
Note: The case slides over the  
holder in only one direction. If it  
doesn’t slide into place on the  
first try, do not force it! Turn the  
case over and try again.  
5. From the right side of the CB,  
slide the battery pack onto the  
bottom of the CB until it clicks  
into place.  
BATT  
To test the batteries, press  
TEST  
on the battery pack. If the indi-  
cator lights, the batteries are still  
good. If the indicator does not light,  
replace all eight batteries.  
6
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21-1589.fm Page 6 Thursday, August 5, 1999 10:10 AM  
3. Install the batteries in the holder  
as indicated by the polarity sym-  
bols (+ and –) marked on the  
holder.  
ATTACHING THE  
ANTENNA  
You can attach the supplied tele-  
scoping antenna to the supplied  
magnetic base or directly to the CB.  
In either case, fully extend the anten-  
na for maximum range.  
Attaching the Antenna  
Directly to the CB  
4. Slide the battery pack’s case  
over the holder until it snaps into  
place.  
To attach the antenna directly to the  
CB, simply screw the antenna into  
ROD ANT  
the CB’s  
jack.  
Note: The case slides over the  
holder in only one direction. If it  
doesn’t slide into place on the  
first try, do not force it! Turn the  
case over and try again.  
5. From the right side of the CB,  
slide the battery pack onto the  
bottom of the CB until it clicks  
into place.  
BATT  
To test the batteries, press  
TEST  
on the battery pack. If the indi-  
cator lights, the batteries are still  
good. If the indicator does not light,  
replace all eight batteries.  
6
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21-1589.fm Page 7 Thursday, August 5, 1999 10:10 AM  
3. Plug the magnetic base’s wire  
Using the Antenna’s  
Magnetic Base  
into EXT ANT.  
Note: The supplied magnetic mount  
base is designed for emergency use  
only while your vehicle is stopped. If  
you want to use the CB when the ve-  
hicle is moving, you need an optional  
standard mount antenna (available  
at your local Radio Shack store). You  
also need a plug adapter (Cat. No.  
278-208) to connect the standard an-  
tenna’s PL-259 plug to EXT ANT on  
your CB.  
1. While your vehicle is stopped,  
screw the antenna into the hole  
on top of the magnetic base.  
2. Place the base as near as possi-  
ble to the center of your vehi-  
cle’s roof.  
Warning: Do not remove the  
metallic backing on the bottom  
of the magnetic base.  
7
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21-1589.fm Page 7 Thursday, August 5, 1999 10:10 AM  
3. Plug the magnetic base’s wire  
Using the Antenna’s  
Magnetic Base  
into EXT ANT.  
Note: The supplied magnetic mount  
base is designed for emergency use  
only while your vehicle is stopped. If  
you want to use the CB when the ve-  
hicle is moving, you need an optional  
standard mount antenna (available  
at your local Radio Shack store). You  
also need a plug adapter (Cat. No.  
278-208) to connect the standard an-  
tenna’s PL-259 plug to EXT ANT on  
your CB.  
1. While your vehicle is stopped,  
screw the antenna into the hole  
on top of the magnetic base.  
2. Place the base as near as possi-  
ble to the center of your vehi-  
cle’s roof.  
Warning: Do not remove the  
metallic backing on the bottom  
of the magnetic base.  
7
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21-1589.fm Page 8 Thursday, August 5, 1999 10:10 AM  
USING THE CB  
Before you start using your CB, you  
should know how to use it effectively  
and courteously. “CB Operation  
Tips” contains information that will  
help you use and enjoy your CB.  
Note: To eliminate background  
noise, see “Setting Range.”  
4. Select a channel as follows:  
To immediately select Chan-  
nel 9, set CH 9 to IN. Channel  
9 is used for emergencies and  
traveler assistance.  
Note: Before you operate the CB, be  
sure you connect a power source  
and an antenna to the CB.  
To select any other channel,  
set CH 9 to OUT. Then press  
CHANNEL UP or DOWN to  
select a channel.  
1. Turn VOLUME clockwise to turn  
on the CB. The volume level  
appears in the VOLUME win-  
dow.  
Note: To check the selected  
channel number, press DISPLAY  
on the side of the CB. The num-  
ber appears for 20 seconds.  
5. To transmit, hold the CB 2-3  
inches from your mouth, press  
and hold down PUSH TO TALK  
on the side of the CB, and speak  
directly into the built-in micro-  
phone.  
2. Set WEATHERADIO-ABC/CB to  
CB.  
3. Turn RANGE fully counterclock-  
wise to set it to 10.  
8
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21-1589.fm Page 8 Thursday, August 5, 1999 10:10 AM  
USING THE CB  
Before you start using your CB, you  
should know how to use it effectively  
and courteously. “CB Operation  
Tips” contains information that will  
help you use and enjoy your CB.  
Note: To eliminate background  
noise, see “Setting Range.”  
4. Select a channel as follows:  
To immediately select Chan-  
nel 9, set CH 9 to IN. Channel  
9 is used for emergencies and  
traveler assistance.  
Note: Before you operate the CB, be  
sure you connect a power source  
and an antenna to the CB.  
To select any other channel,  
set CH 9 to OUT. Then press  
CHANNEL UP or DOWN to  
select a channel.  
1. Turn VOLUME clockwise to turn  
on the CB. The volume level  
appears in the VOLUME win-  
dow.  
Note: To check the selected  
channel number, press DISPLAY  
on the side of the CB. The num-  
ber appears for 20 seconds.  
5. To transmit, hold the CB 2-3  
inches from your mouth, press  
and hold down PUSH TO TALK  
on the side of the CB, and speak  
directly into the built-in micro-  
phone.  
2. Set WEATHERADIO-ABC/CB to  
CB.  
3. Turn RANGE fully counterclock-  
wise to set it to 10.  
8
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21-1589.fm Page 9 Thursday, August 5, 1999 10:10 AM  
In an emergency, broadcast  
your “CLIP”:  
SETTING RANGE  
Call sign — identify yourself  
Location — be exact  
Injuries — number of injured,  
type of injuries, and so on  
Problem  
give complete  
details. Give information calmly,  
clearly, and in as few words as  
possible  
Because this is primarily an emer-  
gency CB, we suggest you leave  
RANGE  
set to 10 when you store the  
6. When you finish transmitting,  
CB. This ensures the maximum re-  
ception range in an emergency.  
PUSH TO TALK  
release  
now receive  
VOLUME  
. You can  
transmissions.  
to the desired  
Adjust  
If you want to eliminate background  
noise when you are not receiving a  
strong signal from another CB, wait  
until you are not receiving a call and  
listening level.  
VOLUME  
7. To turn off the CB, turn  
counterclockwise (toward the  
top of the CB) until you hear it  
click and OFF appears in the  
VOLUME window.  
RANGE  
turn  
clockwise until the back-  
ground noise stops.  
VOLUME  
RANGE  
only af-  
Note:  
and  
fect reception. They have no effect  
on transmissions.  
9
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21-1589.fm Page 9 Thursday, August 5, 1999 10:10 AM  
In an emergency, broadcast  
your “CLIP”:  
SETTING RANGE  
Call sign — identify yourself  
Location — be exact  
Injuries — number of injured,  
type of injuries, and so on  
Problem  
give complete  
details. Give information calmly,  
clearly, and in as few words as  
possible  
Because this is primarily an emer-  
gency CB, we suggest you leave  
RANGE  
set to 10 when you store the  
6. When you finish transmitting,  
CB. This ensures the maximum re-  
ception range in an emergency.  
PUSH TO TALK  
release  
now receive  
VOLUME  
. You can  
transmissions.  
to the desired  
Adjust  
If you want to eliminate background  
noise when you are not receiving a  
strong signal from another CB, wait  
until you are not receiving a call and  
listening level.  
VOLUME  
7. To turn off the CB, turn  
counterclockwise (toward the  
top of the CB) until you hear it  
click and OFF appears in the  
VOLUME window.  
RANGE  
turn  
clockwise until the back-  
ground noise stops.  
VOLUME  
RANGE  
only af-  
Note:  
and  
fect reception. They have no effect  
on transmissions.  
9
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21-1589.fm Page 10 Thursday, August 5, 1999 10:10 AM  
USING THE WEATHERADIO  
In the USA, detailed weather infor-  
mation is continuously broadcast on  
372 government weather stations.  
Each station broadcasts on A —  
162.400, B — 162.475, or C —  
162.550 MHz.  
2. Set WEATHERADIO-ABC/CB to  
A, B or C.  
Most weather stations use frequency  
C, but in locations where there might  
be interference between stations, the  
other two frequencies might be used.  
Choose the frequency that provides  
the best reception at your location.  
3. Adjust VOLUME to the desired  
listening level.  
Notes:  
Follow these steps to receive weath-  
er information.  
• If reception is poor, try one of the  
other two weather station fre-  
quencies.  
Note: Before you use the weathera-  
dio, be sure you connect a power  
source and an antenna to the CB.  
CH9, CHANNEL UP/DOWN, PUSH  
TO TALK, DISPLAY, and RANGE  
have no effect on weatheradio  
operation.  
1. Turn VOLUME clockwise to turn  
on the weatheradio.  
10  
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21-1589.fm Page 10 Thursday, August 5, 1999 10:10 AM  
USING THE WEATHERADIO  
In the USA, detailed weather infor-  
mation is continuously broadcast on  
372 government weather stations.  
Each station broadcasts on A —  
162.400, B — 162.475, or C —  
162.550 MHz.  
2. Set WEATHERADIO-ABC/CB to  
A, B or C.  
Most weather stations use frequency  
C, but in locations where there might  
be interference between stations, the  
other two frequencies might be used.  
Choose the frequency that provides  
the best reception at your location.  
3. Adjust VOLUME to the desired  
listening level.  
Notes:  
Follow these steps to receive weath-  
er information.  
• If reception is poor, try one of the  
other two weather station fre-  
quencies.  
Note: Before you use the weathera-  
dio, be sure you connect a power  
source and an antenna to the CB.  
CH9, CHANNEL UP/DOWN, PUSH  
TO TALK, DISPLAY, and RANGE  
have no effect on weatheradio  
operation.  
1. Turn VOLUME clockwise to turn  
on the weatheradio.  
10  
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21-1589.fm Page 11 Thursday, August 5, 1999 10:10 AM  
CB OPERATION TIPS  
Like most activities, CB radio use has  
its customs and courtesies. The fol-  
lowing tips will help you get the most  
enjoyment from your CB.  
Personal Uses  
• Keep in touch with home while  
driving to work, to the store, or to  
a social activity. Let your family  
know you are tied up in traffic or  
that you will stop by the store on  
the way home.  
COMMON USES FOR A  
CB RADIO  
• If you are a two-car (or more)  
family, CBs are great for com-  
municating with family members  
while they are in their cars.  
Business Uses  
• Truck drivers and delivery per-  
sonnel can learn road and traffic  
conditions and get assistance in  
locating destinations. A CB is  
also good company on those  
“long hauls.”  
• Contact friends or neighbors —  
find out “what’s happening” or  
plan a get-together.  
• Ever have car trouble or run out  
of gas on the highway? What a  
relief it is to be able to radio for  
assistance!  
• On construction crews, a CB  
quickly pays for itself when you  
are calling for additional materi-  
als or coordinating the activities  
of different work crews.  
• Camping, fishing, and other  
sports are more fun with a CB.  
Locate a buddy or find out  
“what’s cooking” back at camp.  
• For security officers, a CB is  
more than a convenience — it is  
a must for both safety and effi-  
ciency.  
11  
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21-1589.fm Page 11 Thursday, August 5, 1999 10:10 AM  
CB OPERATION TIPS  
Like most activities, CB radio use has  
its customs and courtesies. The fol-  
lowing tips will help you get the most  
enjoyment from your CB.  
Personal Uses  
• Keep in touch with home while  
driving to work, to the store, or to  
a social activity. Let your family  
know you are tied up in traffic or  
that you will stop by the store on  
the way home.  
COMMON USES FOR A  
CB RADIO  
• If you are a two-car (or more)  
family, CBs are great for com-  
municating with family members  
while they are in their cars.  
Business Uses  
• Truck drivers and delivery per-  
sonnel can learn road and traffic  
conditions and get assistance in  
locating destinations. A CB is  
also good company on those  
“long hauls.”  
• Contact friends or neighbors —  
find out “what’s happening” or  
plan a get-together.  
• Ever have car trouble or run out  
of gas on the highway? What a  
relief it is to be able to radio for  
assistance!  
• On construction crews, a CB  
quickly pays for itself when you  
are calling for additional materi-  
als or coordinating the activities  
of different work crews.  
• Camping, fishing, and other  
sports are more fun with a CB.  
Locate a buddy or find out  
“what’s cooking” back at camp.  
• For security officers, a CB is  
more than a convenience — it is  
a must for both safety and effi-  
ciency.  
11  
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21-1589.fm Page 12 Thursday, August 5, 1999 10:10 AM  
CB COURTESY  
MAXIMUM RANGE  
• Wait for a pause in someone  
else’s transmission before you  
ask for a break.  
The maximum range and quality of  
CB transmissions vary depending on  
these conditions:  
• If you do not receive an answer  
to your call after a second  
attempt, sign off and wait sev-  
eral minutes before trying again.  
• The type and quality of antenna  
used  
• The height of the antenna’s  
mounting location — the higher  
the antenna, the better the sig-  
nal’s range  
PUSH TO  
• Do not hold down the  
TALK  
button when you are not  
talking. (This is called dead key-  
ing.)  
• The surrounding terrain  
mountains and tall buildings limit  
the range  
• Assist callers with directions,  
road conditions, and any other  
reasonable requests.  
• Weather conditions  
RANGE  
• The current setting of  
your CB  
on  
• The number of nearby CBs  
operating on the same channel  
• Standing Wave Ratio (SWR)  
between the antenna and the  
CB. You can check the SWR  
between the CB and a mobile  
antenna using an SWR tester  
(Cat. No. 21-523). Follow the  
instructions supplied with the  
SWR tester and the mobile  
antenna to change the SWR, if  
necessary.  
12  
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21-1589.fm Page 12 Thursday, August 5, 1999 10:10 AM  
CB COURTESY  
MAXIMUM RANGE  
• Wait for a pause in someone  
else’s transmission before you  
ask for a break.  
The maximum range and quality of  
CB transmissions vary depending on  
these conditions:  
• If you do not receive an answer  
to your call after a second  
attempt, sign off and wait sev-  
eral minutes before trying again.  
• The type and quality of antenna  
used  
• The height of the antenna’s  
mounting location — the higher  
the antenna, the better the sig-  
nal’s range  
PUSH TO  
• Do not hold down the  
TALK  
button when you are not  
talking. (This is called dead key-  
ing.)  
• The surrounding terrain  
mountains and tall buildings limit  
the range  
• Assist callers with directions,  
road conditions, and any other  
reasonable requests.  
• Weather conditions  
RANGE  
• The current setting of  
your CB  
on  
• The number of nearby CBs  
operating on the same channel  
• Standing Wave Ratio (SWR)  
between the antenna and the  
CB. You can check the SWR  
between the CB and a mobile  
antenna using an SWR tester  
(Cat. No. 21-523). Follow the  
instructions supplied with the  
SWR tester and the mobile  
antenna to change the SWR, if  
necessary.  
12  
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21-1589.fm Page 13 Thursday, August 5, 1999 10:10 AM  
USING COMMON 10-  
CODES  
Code  
Meaning  
10-14 Information.  
Citizen’s band operators have largely  
adopted the 10-codes for standard  
questions and answers. Their use  
permits faster communication and  
better intelligibility in noisy areas.  
10-15 Message delivered.  
10-16 Reply to message.  
10-17 En route.  
10-18 Urgent.  
This table lists the codes adopted by  
the Associated Public Safety Com-  
munications Officers (APCO).  
10-19 Contact __________.  
10-20 My location is __________.  
10-21 Call ________ by tele-  
phone.  
Code  
Meaning  
10-1  
Cannot understand your  
message.  
10-22 Cancel last message.  
10-23 Arrived at the scene.  
10-24 Assignment complete.  
10-2  
10-3  
10-4  
Your signal is good.  
Stop transmitting.  
10-26 Estimated time of arrival is  
_________.  
Message received and  
understood.  
10-30 Use caution.  
10-31 Pick up.  
10-5  
Relay information to  
__________.  
10-6  
I am busy.  
10-33 Emergency traffic. Clear the  
channel.  
10-7  
Out of service.  
In service.  
10-34 The time is _____.  
10-8  
Note: Although this table lists the 10-  
codes’ meanings in the form of a  
statement, they can also be phrased  
as questions (10-6: Are you busy?,  
10-20: What is your location?).  
10-9  
Repeat last message.  
Negative (No).  
_____________ in service.  
Stand by.  
10-10  
10-11  
10-12  
10-13  
Report ___________ condi-  
tions.  
13  
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21-1589.fm Page 13 Thursday, August 5, 1999 10:10 AM  
USING COMMON 10-  
CODES  
Code  
Meaning  
10-14 Information.  
Citizen’s band operators have largely  
adopted the 10-codes for standard  
questions and answers. Their use  
permits faster communication and  
better intelligibility in noisy areas.  
10-15 Message delivered.  
10-16 Reply to message.  
10-17 En route.  
10-18 Urgent.  
This table lists the codes adopted by  
the Associated Public Safety Com-  
munications Officers (APCO).  
10-19 Contact __________.  
10-20 My location is __________.  
10-21 Call ________ by tele-  
phone.  
Code  
Meaning  
10-1  
Cannot understand your  
message.  
10-22 Cancel last message.  
10-23 Arrived at the scene.  
10-24 Assignment complete.  
10-2  
10-3  
10-4  
Your signal is good.  
Stop transmitting.  
10-26 Estimated time of arrival is  
_________.  
Message received and  
understood.  
10-30 Use caution.  
10-31 Pick up.  
10-5  
Relay information to  
__________.  
10-6  
I am busy.  
10-33 Emergency traffic. Clear the  
channel.  
10-7  
Out of service.  
In service.  
10-34 The time is _____.  
10-8  
Note: Although this table lists the 10-  
codes’ meanings in the form of a  
statement, they can also be phrased  
as questions (10-6: Are you busy?,  
10-20: What is your location?).  
10-9  
Repeat last message.  
Negative (No).  
_____________ in service.  
Stand by.  
10-10  
10-11  
10-12  
10-13  
Report ___________ condi-  
tions.  
13  
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21-1589.fm Page 14 Thursday, August 5, 1999 10:10 AM  
TROUBLESHOOTING  
If your CB is not working as it should, follow the suggestions below to see if you  
can eliminate the problem. If you cannot, take the CB to your local Radio Shack  
store for assistance.  
Symptom  
Remedy  
CHANNEL UP/DOWN buttons do  
• If CH 9 is set to IN, set it to OUT, then use the  
not work.  
CHANNEL UP/DOWN buttons.  
• Set WEATHERADIO-ABC/CB to CB.  
No channel display.  
Not transmitting well.  
• Press DISPLAY. The CB displays the channel.  
• Set WEATHERADIO-ABC/CB to CB.  
• Set WEATHERADIO-ABC/CB to CB.  
• Fully press PUSH TO TALK.  
• Secure the antenna connection.  
• Fully extend the antenna.  
Not receiving well.  
• Set WEATHERADIO-ABC/CB to CB.  
• Properly adjust RANGE.  
• Properly adjust VOLUME.  
• Secure the antenna connection.  
• Fully extend the antenna.  
No weatheradio reception.  
CB does not operate at all.  
• Set WEATHERADIO-ABC/CB to WEATHERADIO-  
A, B, or C.  
• Set it to the channel that provides the best  
reception.  
• Fully extend the antenna.  
• Check the DC power connection.  
• Replace the blown fuse in the power cord.  
• Insufficient battery pack power. Press BATT  
TEST to check, and replace the batteries, if  
necessary.  
• Turn on VOLUME.  
14  
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21-1589.fm Page 14 Thursday, August 5, 1999 10:10 AM  
TROUBLESHOOTING  
If your CB is not working as it should, follow the suggestions below to see if you  
can eliminate the problem. If you cannot, take the CB to your local Radio Shack  
store for assistance.  
Symptom  
Remedy  
CHANNEL UP/DOWN buttons do  
• If CH 9 is set to IN, set it to OUT, then use the  
not work.  
CHANNEL UP/DOWN buttons.  
• Set WEATHERADIO-ABC/CB to CB.  
No channel display.  
Not transmitting well.  
• Press DISPLAY. The CB displays the channel.  
• Set WEATHERADIO-ABC/CB to CB.  
• Set WEATHERADIO-ABC/CB to CB.  
• Fully press PUSH TO TALK.  
• Secure the antenna connection.  
• Fully extend the antenna.  
Not receiving well.  
• Set WEATHERADIO-ABC/CB to CB.  
• Properly adjust RANGE.  
• Properly adjust VOLUME.  
• Secure the antenna connection.  
• Fully extend the antenna.  
No weatheradio reception.  
CB does not operate at all.  
• Set WEATHERADIO-ABC/CB to WEATHERADIO-  
A, B, or C.  
• Set it to the channel that provides the best  
reception.  
• Fully extend the antenna.  
• Check the DC power connection.  
• Replace the blown fuse in the power cord.  
• Insufficient battery pack power. Press BATT  
TEST to check, and replace the batteries, if  
necessary.  
• Turn on VOLUME.  
14  
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21-1589.fm Page 15 Thursday, August 5, 1999 10:10 AM  
• If problems persist, check your  
alternator/generator and regula-  
tor gauges. Noise from these  
sources can be reduced or elimi-  
nated using bypass capacitors  
at the various voltage points.  
REDUCING NOISE  
Because your CB is exceptionally  
quiet, any noise you hear is probably  
from an external source in your vehi-  
cle — the ignition, another radio,  
spark plugs, and so forth.  
Note: Your local Radio Shack store  
has a wide selection of noise-sup-  
pression equipment.  
You can determine the source of the  
noise by turning off the engine and  
operating the CB with the ignition set  
to ACC. If most or all of the noise  
goes away, the problem is in your ve-  
hicle’s ignition or electrical system.  
Here are a few hints to help you re-  
duce or eliminate such noise:  
• Do not route the DC power cord  
next to the antenna wire.  
• Be sure the antenna’s magnetic  
base is securely attached to a  
metallic surface. If you use an  
antenna other than the mag-  
netic-mount type, be sure that  
the vehicle battery’s ground con-  
nection is secure.  
• Replace old ignition wires with  
new, high-voltage, noise-sup-  
pression ignition wires.  
• Install noise suppressors on  
your spark plugs or install spark  
plugs that have built-in suppres-  
sors.  
15  
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21-1589.fm Page 15 Thursday, August 5, 1999 10:10 AM  
• If problems persist, check your  
alternator/generator and regula-  
tor gauges. Noise from these  
sources can be reduced or elimi-  
nated using bypass capacitors  
at the various voltage points.  
REDUCING NOISE  
Because your CB is exceptionally  
quiet, any noise you hear is probably  
from an external source in your vehi-  
cle — the ignition, another radio,  
spark plugs, and so forth.  
Note: Your local Radio Shack store  
has a wide selection of noise-sup-  
pression equipment.  
You can determine the source of the  
noise by turning off the engine and  
operating the CB with the ignition set  
to ACC. If most or all of the noise  
goes away, the problem is in your ve-  
hicle’s ignition or electrical system.  
Here are a few hints to help you re-  
duce or eliminate such noise:  
• Do not route the DC power cord  
next to the antenna wire.  
• Be sure the antenna’s magnetic  
base is securely attached to a  
metallic surface. If you use an  
antenna other than the mag-  
netic-mount type, be sure that  
the vehicle battery’s ground con-  
nection is secure.  
• Replace old ignition wires with  
new, high-voltage, noise-sup-  
pression ignition wires.  
• Install noise suppressors on  
your spark plugs or install spark  
plugs that have built-in suppres-  
sors.  
15  
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21-1589.fm Page 16 Thursday, August 5, 1999 10:10 AM  
MAINTENANCE  
Your TRC-494 is an example of superior design and craftsmanship. The follow-  
ing suggestions will help you care for your TRC-494 so you can enjoy it for years.  
Keep the TRC-494 dry. If it gets wet, wipe it dry immediately. Liq-  
uids might contain minerals that can corrode the electronic cir-  
cuits.  
Handle the TRC-494 gently and carefully. Dropping it can damage  
circuit boards and cases and can cause the TRC-494 to work im-  
properly.  
Use and store the TRC-494 only in normal temperature environ-  
ments. Temperature extremes can shorten the life of electronic  
devices and distort or melt plastic parts.  
Keep the TRC-494 away from dust and dirt, which can cause pre-  
mature wear of parts.  
Wipe the TRC-494 with a damp cloth occasionally to keep it look-  
CLEANER  
ing new. Do not use harsh chemicals, cleaning solvents, or strong  
detergents to clean the TRC-494.  
Modifying or tampering with the TRC-494’s internal components can cause a  
malfunction and might invalidate your TRC-494’s warranty and void your FCC  
authorization to operate it. If your TRC-494 is not performing as it should, take it  
to your local Radio Shack store for assistance.  
16  
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21-1589.fm Page 16 Thursday, August 5, 1999 10:10 AM  
MAINTENANCE  
Your TRC-494 is an example of superior design and craftsmanship. The follow-  
ing suggestions will help you care for your TRC-494 so you can enjoy it for years.  
Keep the TRC-494 dry. If it gets wet, wipe it dry immediately. Liq-  
uids might contain minerals that can corrode the electronic cir-  
cuits.  
Handle the TRC-494 gently and carefully. Dropping it can damage  
circuit boards and cases and can cause the TRC-494 to work im-  
properly.  
Use and store the TRC-494 only in normal temperature environ-  
ments. Temperature extremes can shorten the life of electronic  
devices and distort or melt plastic parts.  
Keep the TRC-494 away from dust and dirt, which can cause pre-  
mature wear of parts.  
Wipe the TRC-494 with a damp cloth occasionally to keep it look-  
CLEANER  
ing new. Do not use harsh chemicals, cleaning solvents, or strong  
detergents to clean the TRC-494.  
Modifying or tampering with the TRC-494’s internal components can cause a  
malfunction and might invalidate your TRC-494’s warranty and void your FCC  
authorization to operate it. If your TRC-494 is not performing as it should, take it  
to your local Radio Shack store for assistance.  
16  
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21-1589.fm Page 17 Thursday, August 5, 1999 10:10 AM  
REPLACING THE  
POWER CORD’S FUSE  
The TRC-494’s 2-amp fuse helps  
protect your CB from power surges  
and short circuits. If the fuse is blown,  
replace it with a 2-amp, 250-volt,  
fast-acting fuse (Cat. No. 270-1052).  
Follow these steps to replace the  
fuse.  
1. Unplug the power cord from the  
vehicle’s cigarette lighter and be  
sure the CB is turned off.  
2. To open the cigarette-lighter  
plug and remove the fuse, turn  
either end counterclockwise and  
release it.  
3. If the fuse is blown, replace it.  
Caution: Make sure you replace  
the fuse only with another fuse  
of the same type and rating.  
4. To close the cigarette-lighter  
plug, put the open ends  
together, then turn either end  
clockwise.  
17  
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21-1589.fm Page 17 Thursday, August 5, 1999 10:10 AM  
REPLACING THE  
POWER CORD’S FUSE  
The TRC-494’s 2-amp fuse helps  
protect your CB from power surges  
and short circuits. If the fuse is blown,  
replace it with a 2-amp, 250-volt,  
fast-acting fuse (Cat. No. 270-1052).  
Follow these steps to replace the  
fuse.  
1. Unplug the power cord from the  
vehicle’s cigarette lighter and be  
sure the CB is turned off.  
2. To open the cigarette-lighter  
plug and remove the fuse, turn  
either end counterclockwise and  
release it.  
3. If the fuse is blown, replace it.  
Caution: Make sure you replace  
the fuse only with another fuse  
of the same type and rating.  
4. To close the cigarette-lighter  
plug, put the open ends  
together, then turn either end  
clockwise.  
17  
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21-1589.fm Page 18 Thursday, August 5, 1999 10:10 AM  
SPECIFICATIONS  
RECEIVER  
Frequency Coverage ...............................................(CB) 26.965 to 27.405 MHz  
(Weatheradio) 162.400, 162.475, 162.550 MHz  
Sensitivity (Maximum) ............................................................................ 0.25 uV  
Adjacent Channel Selectivity ................................................. . 60 dB (at 10 kHz)  
Squelch ........................................................................................................1 mV  
Audio Output ..........................................................................0.28 W (10% THD)  
Current Drain ................................................................................. 85 – 550 mA  
TRANSMITTER  
Frequency Coverage ....................................................... 26.965 – 27.405 MHz  
Power Input (at 12 V DC).............................................................................. 5 W  
Power Output..............................................................................................2.5 W  
Spurious Emission ..................................................................................... 70 dB  
Type of Modulation.........................................................................................A3E  
Frequency Tolerance ............................................................................. ±100 Hz  
Antenna............................................................................................. Telescoping  
Impedance ..............................................................................................50ohms  
Current Drain at No Modulation ............................................ 600 mA to 800 mA  
Current Drain at Full Modulation ...........................................900 mA to 1200 mA  
Weight........................................................................................ 15 oz. (425 gm)  
5
11  
9
Dimensions (HWD) ................................................................... 9 /8 x 2 /16 x 1 /16  
(245 x 68 x 40 mm)  
Specifications are typical; individual units might vary. Specifications are subject  
to change and improvement without notice.  
18  
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21-1589.fm Page 18 Thursday, August 5, 1999 10:10 AM  
SPECIFICATIONS  
RECEIVER  
Frequency Coverage ...............................................(CB) 26.965 to 27.405 MHz  
(Weatheradio) 162.400, 162.475, 162.550 MHz  
Sensitivity (Maximum) ............................................................................ 0.25 uV  
Adjacent Channel Selectivity ................................................. . 60 dB (at 10 kHz)  
Squelch ........................................................................................................1 mV  
Audio Output ..........................................................................0.28 W (10% THD)  
Current Drain ................................................................................. 85 – 550 mA  
TRANSMITTER  
Frequency Coverage ....................................................... 26.965 – 27.405 MHz  
Power Input (at 12 V DC).............................................................................. 5 W  
Power Output..............................................................................................2.5 W  
Spurious Emission ..................................................................................... 70 dB  
Type of Modulation.........................................................................................A3E  
Frequency Tolerance ............................................................................. ±100 Hz  
Antenna............................................................................................. Telescoping  
Impedance ..............................................................................................50ohms  
Current Drain at No Modulation ............................................ 600 mA to 800 mA  
Current Drain at Full Modulation ...........................................900 mA to 1200 mA  
Weight........................................................................................ 15 oz. (425 gm)  
5
11  
9
Dimensions (HWD) ................................................................... 9 /8 x 2 /16 x 1 /16  
(245 x 68 x 40 mm)  
Specifications are typical; individual units might vary. Specifications are subject  
to change and improvement without notice.  
18  
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21-1589.fm Page 19 Thursday, August 5, 1999 10:10 AM  
NOTES  
19  
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21-1589.fm Page 19 Thursday, August 5, 1999 10:10 AM  
NOTES  
19  
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21-1589.fm Page 20 Thursday, August 5, 1999 10:10 AM  
RADIO SHACK LIMITED WARRANTY  
This product is warranted against defects for 90 days from date of pur-  
chase from Radio Shack company-owned stores and authorized Radio  
Shack franchisees and dealers. Within this period, we will repair it with-  
bring your Radio Shack sales  
out charge for parts and labor. Simply  
slip  
as proof of purchase date to any Radio Shack store. Warranty does  
not cover transportation costs. Nor does it cover a product subjected to  
misuse or accidental damage.  
EXCEPT AS PROVIDED HEREIN, RADIO SHACK MAKES NO  
EXPRESS WARRANTIES AND ANY IMPLIED WARRANTIES ARE LIM-  
ITED IN DURATION TO THE DURATION OF THE WRITTEN LIMITED  
WARRANTIES CONTAINED HEREIN. Some states do not permit limita-  
tion or exclusion of implied warranties; therefore, the aforesaid limita-  
tion(s) or exclusion(s) may not apply to the purchaser.  
This warranty gives you specific legal rights and you may also have other rights which vary  
from state to state.  
We Service What We Sell  
9/94  
RADIO SHACK  
A Division of Tandy Corporation  
Fort Worth, Texas 76102  
5A5  
Printed in Hong Kong  
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21-1589.fm Page 20 Thursday, August 5, 1999 10:10 AM  
RADIO SHACK LIMITED WARRANTY  
This product is warranted against defects for 90 days from date of pur-  
chase from Radio Shack company-owned stores and authorized Radio  
Shack franchisees and dealers. Within this period, we will repair it with-  
bring your Radio Shack sales  
out charge for parts and labor. Simply  
slip  
as proof of purchase date to any Radio Shack store. Warranty does  
not cover transportation costs. Nor does it cover a product subjected to  
misuse or accidental damage.  
EXCEPT AS PROVIDED HEREIN, RADIO SHACK MAKES NO  
EXPRESS WARRANTIES AND ANY IMPLIED WARRANTIES ARE LIM-  
ITED IN DURATION TO THE DURATION OF THE WRITTEN LIMITED  
WARRANTIES CONTAINED HEREIN. Some states do not permit limita-  
tion or exclusion of implied warranties; therefore, the aforesaid limita-  
tion(s) or exclusion(s) may not apply to the purchaser.  
This warranty gives you specific legal rights and you may also have other rights which vary  
from state to state.  
We Service What We Sell  
9/94  
RADIO SHACK  
A Division of Tandy Corporation  
Fort Worth, Texas 76102  
5A5  
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