Radio Shack Radio TRC 442 User Guide

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Cat. No. 21-1586  
OWNER’S MANUAL  
Please read before using this equipment.  
TRC-442  
Full-Power 40-Channel  
Mobile CB Radio  
 
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Your CB radio might cause TV or ra-  
dio interference even when it is oper-  
ating properly. To determine whether  
your CB radio is causing the interfer-  
ence, turn off your CB. If the interfer-  
ence goes away, your CB radio is  
causing it. Try to eliminate the interfer-  
ence by:  
FCC INFORMATION  
The Federal Communications Com-  
mission (FCC) does not require you to  
have a license to operate this CB ra-  
dio. However, you must know Part 95  
of FCC Rules. It explains the proper  
operation of a Class D citizen’s band  
transceiver. We have provided a copy  
of these regulations with your CB ra-  
dio.  
• Moving your CB radio away from  
the receiver  
• Contacting  
your  
local  
Ra-  
dioShack store for help  
Warning: Do not open your CB to  
make any internal adjustments. Any  
internal adjustments can be made  
only by an authorized service techni-  
cian.  
If you cannot eliminate the interfer-  
ence, the FCC requires that you stop  
using your CB radio.  
This device complies with Part 15 of  
FCC Rules. Operation is subject to the  
following two conditions: (1) this de-  
vice may not cause harmful interfer-  
ence, and (2) this device must accept  
any interference received, including  
interference that may cause undesired  
operation.  
Internal adjustments and/or modifica-  
tions 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 radio’s case.  
• Never change or replace anything  
in your CB radio.  
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CONTENTS  
Installation ............................................................................................................ 5  
Attaching the Microphone Holder .................................................................... 5  
Mounting the TRC-442 .................................................................................... 5  
Connecting the Microphone ............................................................................. 7  
Installing an Antenna ....................................................................................... 7  
Selecting an Antenna ................................................................................ 7  
Connecting an Antenna ............................................................................ 7  
Using Vehicle Battery Power ........................................................................... 8  
Using the CB as a Base Station ...................................................................... 9  
Operation ............................................................................................................ 10  
Turning On the CB and Receiving Transmissions ......................................... 10  
Transmitting ................................................................................................... 11  
CB Operation Tips .............................................................................................. 12  
Common Uses for a CB Radio ...................................................................... 12  
Business Uses ........................................................................................ 12  
Personal Uses ......................................................................................... 12  
CB Courtesy .................................................................................................. 12  
Using Common 10-Codes ............................................................................. 13  
Maximum Range ........................................................................................... 14  
Troubleshooting ................................................................................................. 15  
Reducing Noise ............................................................................................. 16  
Care and Maintenance ....................................................................................... 17  
Replacing the Fuse ........................................................................................ 18  
Specifications ..................................................................................................... 19  
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INSTALLATION  
3. Attach the holder at the mounting  
location using the supplied mount-  
ing screws, lockwashers, wash-  
ers, and nuts.  
ATTACHING THE  
MICROPHONE HOLDER  
You can connect the microphone hold-  
er to the right side of the transceiver or  
to another location in your vehicle.  
To attach the holder to the transceiver,  
secure it with the supplied mounting  
screws and lockwashers.  
MOUNTING THE TRC-442  
The most common mounting location  
for this CB is under a vehicle’s dash-  
board. However, if you use the TRC-  
442 as a base station, you can place it  
on a desk, shelf, or table. See “Using  
the CB as a Base Station” on Page 9.  
To attach the holder to another loca-  
tion in the vehicle, such as the dash-  
board, follow these steps.  
1. Using the holder as a template,  
mark the positions for the mount-  
ing screw holes at the desired  
location.  
If you are mounting the CB in a vehi-  
cle, choose a location where:  
• You can easily reach the CB.  
2. At each marked position, drill a  
hole slightly smaller than the sup-  
plied mounting screws.  
• Wires and cables are clear of the  
vehicle’s pedals or other moving  
parts.  
Caution: Be careful not to drill  
into anything behind the mount-  
ing surface.  
• The CB is not directly in front of  
heating vents.  
• All wires and cables can reach  
their connection points.  
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Cautions:  
3. Attach the bracket to the mounting  
surface with the supplied mount-  
ing bolts, lockwashers, washers,  
and nuts.  
• If you use the TRC-442 in a vehi-  
cle, mount it securely to avoid  
damage to the CB or vehicle or in-  
jury to anyone in the vehicle dur-  
ing 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  
using the supplied hardware.  
Note: If you cannot reach behind  
the mounting surface to attach the  
nuts on the bolts, use the supplied  
screws, lockwashers, and wash-  
ers to secure the bracket.  
1. Using the mounting bracket as a  
template, mark the positions for  
the screw holes on the mounting  
surface.  
4. Attach the CB to the mounting  
bracket using the supplied rubber  
washers and mounting knobs.  
2. In each marked location, drill a  
hole slightly smaller than the sup-  
plied mounting bolts.  
Rubber Washer  
Caution: Be careful not to drill  
into objects behind the mounting  
surface.  
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Note: If you are using this CB as a  
base station, see “Using the CB as a  
Base Station” on Page 9.  
CONNECTING THE  
MICROPHONE  
1. Align the notch on the microphone  
cable’s plug with the ridge in the  
Selecting an Antenna  
MIC  
jack, then insert the plug into  
the jack.  
When deciding on an antenna and  
where to locate it, consider these  
points:  
• The location of the antenna  
should be as high as possible.  
• The antenna and antenna cable  
should be as far as possible from  
sources of electrical noise (igni-  
tion systems, gauges, and so on).  
2. Tighten the microphone cable’s  
outer ring by turning it clockwise.  
3. Slide the microphone onto the mi-  
crophone holder.  
Your local RadioShack store sells a  
variety of CB antennas for both mobile  
and base-station use. Choose the one  
that best meets your needs.  
4. To disconnect the microphone,  
loosen the microphone cable’s  
outer ring by turning it counter-  
clockwise, then pull out the plug.  
Connecting an Antenna  
Once you choose an antenna, follow  
its mounting instructions. Route the  
antenna’s cable to the CB, then screw  
ANTENNA  
the cable to the  
back of the CB.  
jack on the  
Caution: Never pull on the micro-  
phone cable.  
INSTALLING AN  
ANTENNA  
Caution: To prevent damage to your  
CB, you must connect an antenna to it  
before you operate it.  
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Cautions:  
USING VEHICLE  
• Do not run the cable over sharp  
edges or moving parts that might  
damage it.  
BATTERY POWER  
You can power this CB from your vehi-  
cle’s battery or from standard AC pow-  
er with an optional DC power supply.  
For information on using AC power,  
see “Using the CB as a Base Station”  
on Page 9.  
• Do not run the cable next to power  
cables or other CB antenna  
cables.  
• Do not run the cable through a  
vehicle’s engine compartment or  
other areas that produce extreme  
heat.  
Follow these steps to power the CB  
from your vehicle’s battery.  
Note: To achieve your radio’s maxi-  
mum range, adjust the antenna’s  
Standing Wave Ratio (SWR) using an  
SWR meter (not supplied).  
Red wire to switched  
accessory terminal  
Follow the instructions supplied with  
the SWR meter and antenna to adjust  
your antenna’s SWR to the lowest pos-  
sible value. SWR values of 2.0:1 are  
generally acceptable, with readings of  
1.5:1 or lower being more desirable.  
Black wire to vehicle’s frame  
or battery (–)  
1. Connect the red wire, with the in-  
line fuse, to a source of voltage  
that turns on and off with the igni-  
tion switch, such as a spare  
accessory terminal in your vehi-  
cle’s fuse box. This prevents the  
battery from being drained if you  
leave the CB on when you turn off  
the ignition.  
2. Connect the black wire to your  
vehicle battery’s negative (–) ter-  
minal or to a metal part of the  
vehicle’s frame that is not insu-  
lated from the frame by a plastic  
part.  
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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 con-  
tact 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.  
USING THE CB AS A  
BASE STATION  
Although this CB 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 the following items (all avail-  
able at your local RadioShack store):  
• 12-volt DC power supply (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 in-  
cluded with the power supply.  
2. Route the antenna cable to the  
CB, then connect the antenna to  
ANTENNA  
the  
the CB.  
jack on the back of  
3. Connect the CB’s black power  
wire to the negative (–) terminal  
on the DC power supply.  
• Base station antenna (such as  
Cat. No. 21-969)  
4. Connect the CB’s red wire, with  
the in-line fuse, to the positive (+)  
terminal on the DC power supply.  
• Coaxial antenna cable and con-  
nectors  
5. Connect the DC power supply to a  
standard AC outlet.  
Follow these steps to install the CB as  
a base station.  
Red wire  
to switched  
accessory  
terminal  
Black wire to vehicle’s  
frame or battery (–)  
1. Mount the base station antenna  
as described in its owner’s man-  
ual.  
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OPERATION  
Before you use your CB radio, you  
should know how to use it effectively  
and courteously. “CB Operation Tips”  
on Page 12 contains information that  
will help you get more enjoyment from  
your CB radio.  
3. To tune to a specific channel, ro-  
tate CHANNEL clockwise or coun-  
terclockwise until the display  
shows the desired channel.  
TURNING ON THE CB  
AND RECEIVING  
TRANSMISSIONS  
To rapidly move up or down the  
channels, turn CHANNEL only  
slightly to the left or right.  
1. Turn SQUELCH fully counterclock-  
4. Slowly turn SQUELCH clockwise  
wise.  
until the hissing sound stops.  
Note: If the CB picks up  
unwanted, partial, or very weak  
transmissions, turn SQUELCH  
clockwise to decrease the CB’s  
sensitivity to these signals. Turn  
SQUELCH counterclockwise if you  
want to listen to a weak or distant  
station.  
2. To turn on the CB, turn VOLUME  
clockwise until it clicks and you  
hear a hissing sound. The CB dis-  
plays the last selected channel.  
5. Adjust VOLUME to a comfortable  
listening level.  
6. To turn off the CB, turn VOLUME  
counterclockwise until it clicks.  
10  
 
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TRANSMITTING  
Note: We recommend you try receiv-  
ing before you transmit.  
1. Follow Steps 1–5 in “Turning On  
the CB and Receiving Transmis-  
sions” on Page 10.  
PUSH TO TALK  
2. Hold down  
and  
speak into the microphone in a  
normal voice from about 2–3  
inches away. The orange TX indi-  
cator lights.  
Note: Do not speak too loudly  
when transmitting. It does not  
make your signal any stronger,  
and might distort your transmis-  
sion.  
3. When you finish transmitting, re-  
PUSH TO TALK  
lease  
. The TX indi-  
cator turns off. The TRC-442 can  
now receive transmissions.  
VOLUME  
4. To turn off the CB, turn  
counterclockwise until it clicks.  
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CB OPERATION TIPS  
Like most activities, CB radio has its  
customs and courtesies. The following  
tips will help you get the most enjoy-  
ment from your CB.  
• 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 an as-  
surance it is to be able to radio for  
assistance!  
COMMON USES FOR A  
CB RADIO  
• Camping, fishing, and other sports  
are more fun with a CB radio.  
Locate a buddy or find out “what’s  
cooking” back at camp.  
Business Uses  
• Truck drivers and delivery person-  
nel can learn road and traffic con-  
ditions and get assistance in  
locating destinations. A CB is also  
good company on those “long  
hauls.”  
CB COURTESY  
• Wait for a pause in someone  
else’s transmission before you  
ask for a break.  
• On construction crews, a CB  
quickly pays for itself when you  
are calling for additional materials  
or coordinating the activities of dif-  
ferent work crews.  
• If you do not receive an answer to  
your call after a second attempt,  
sign off and wait several minutes  
before trying again.  
• For security officers, a CB is more  
than a convenience — it is a must  
for both safety and efficiency.  
• Do not hold down the microphone  
talk button when you are not talk-  
ing. (This is called “dead keying.”)  
Personal Uses  
• Assist callers with directions,  
information about road conditions,  
• 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.  
and  
requests.  
any  
other  
reasonable  
• If you are a two-car (or more) fam-  
ily, CB radios are great for com-  
municating with family members  
while they are in their cars.  
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USING COMMON 10-CODES  
Citizen’s band operators have largely adopted the 10-codes for standard questions  
and answers. These codes permit faster communication and better intelligibility in  
noisy areas. This table lists codes adopted by the Associated Public-Safety Commu-  
nications Officers (APCO).  
Code  
Meaning  
Code  
Meaning  
10-1  
10-2  
10-3  
Your signal is bad.  
Your signal is good.  
Stop transmitting.  
10-17  
10-18  
10-19  
10-20  
10-21  
10-22  
10-23  
10-24  
10-25  
En route.  
Urgent.  
Contact _____.  
Message received and under-  
stood.  
What is your location?  
Call _____ by telephone.  
Cancel last message.  
Arrived at the scene.  
Assignment complete.  
Meet _____.  
10-4  
10-5  
Relay information to _____.  
I am busy or are you busy?  
Out of service.  
10-6  
10-7  
10-8  
In service.  
10-9  
10-10  
10-11  
10-12  
Repeat last message.  
Negative (No).  
Estimated time of arrival is  
_____.  
10-26  
_____ in service.  
Stand by.  
10-30  
10-31  
Use caution.  
Pick up.  
Report road/weather condi-  
tions.  
Emergency traffic. Clear the  
channel.  
10-13  
10-33  
10-14  
10-15  
10-16  
Information.  
10-34  
10-41  
10-62  
What time is it?  
Message delivered.  
Reply to message.  
Switch to Channel _.  
Cannot understand.  
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 loca-  
tion?).  
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MAXIMUM RANGE  
The maximum range and quality of CB  
radio transmissions vary depending  
on these conditions:  
• 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  
• The surrounding terrain — moun-  
tains and tall buildings limit the  
range  
• Weather conditions  
• The number of nearby CBs oper-  
ating on the same channel  
• Standing wave ratio (SWR) be-  
tween the antenna and the CB  
Note: Your CB radio’s transmission  
range is generally line-of-sight.  
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TROUBLESHOOTING  
If your CB is not working as it should, follow these suggestions to see if you can  
eliminate the problem. If you cannot, take the CB to your local RadioShack store for  
assistance.  
Symptom:  
Check That:  
• The CB is turned on.  
Trouble with reception  
VOLUME is turned up.  
SQUELCH is turned counterclockwise.  
PUSH TO TALK is not being pressed in.  
• The antenna cable is securely connected to  
both the antenna and the CB.  
Trouble with transmission  
• The CB is turned on.  
VOLUME is turned up.  
• The microphone is securely connected to the  
CB.  
• All connectors are clean and tightened.  
• You are fully pressing PUSH TO TALK  
• The antenna cable is securely connected to  
both the antenna and the CB.  
No channel selection  
You are not pressing PUSH TO TALK. You cannot  
change channels when PUSH TO TALK is pressed.  
CB does not work at all  
• The power supply and in-line fuse are working  
(see “Replacing the Fuse’’ on Page 18).  
• The red (+) and black (–) wires are connected  
properly when using vehicle battery power.  
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• If problems persist, check your  
alternator/generator and regula-  
tor gauges. You can reduce the  
noise from these sources by using  
bypass capacitors at the various  
output voltage points.  
REDUCING NOISE  
Because your CB is exceptionally qui-  
et, any noise you hear through the CB  
is probably from an external source in  
your vehicle such as the alternator, an-  
other radio, or spark plugs.  
Your local RadioShack store has a  
wide selection of noise suppression  
accessories.  
The transceiver uses an ANL (Auto-  
matic Noise Limiter) circuit to reduce  
noise. However, if possible, try to elim-  
inate the noise by finding its source.  
You can determine the noise’s source  
by turning off the engine and operating  
the CB with your vehicle’s ignition set  
to ACC. If the noise is reduced, the  
problem is in your vehicle’s ignition or  
electrical system.  
Here are a few hints to help you re-  
duce or eliminate such noise:  
• Make all CB power and antenna  
wires as short as possible.  
• Route the power wires away from  
the antenna wires.  
• Be sure that the chassis ground  
connection is secure.  
• Replace old ignition wires with  
new, high-voltage, noise suppres-  
sion wires.  
• Install noise suppressors on your  
spark plugs, or install new spark  
plugs that have built-in noise sup-  
pressors.  
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CARE AND MAINTENANCE  
Your RadioShack TRC-442 Full-Power 40-Channel Mobile CB Radio is an example  
of superior design and craftsmanship. The following suggestions will help you care  
for your CB so you can enjoy it for years.  
Keep the CB dry. If it gets wet, wipe it dry immediately. Liquids might  
contain minerals that can corrode the electronic circuits.  
Keep the CB away from dust and dirt, which can cause premature  
wear of parts.  
Handle the CB gently and carefully. Dropping it can damage circuit  
boards and cases and can cause the CB to work improperly.  
Wipe the CB with a damp cloth occasionally to keep it looking new.  
Do not use harsh chemicals, cleaning solvents, or strong detergents  
to clean the CB.  
Modifying or tampering with the CB’s internal components can cause a malfunction  
and might invalidate the CB’s warranty and void your FCC authorization to operate  
it. If your CB is not performing as it should, take it to your local RadioShack store  
for assistance.  
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REPLACING THE FUSE  
The TRC-442’s 2-amp in-line fuse  
helps protect your CB from power  
surges and short circuits. If the CB los-  
es power because the fuse has burned  
out, replace it using a 2-amp, slow-  
blow glass fuse, such as Cat. No. 270-  
1023.  
Caution: Make sure you replace the  
fuse only with another fuse of the same  
type and rating.  
Follow these steps to replace the fuse.  
1. Make sure the power source and  
CB are both off.  
2. Holding the fuse holder by both  
ends, push the ends together,  
twist one end counterclockwise,  
then pull them apart.  
3. If the fuse is blown, replace it.  
4. To close the fuse holder, align the  
tabs and slots at the ends, and  
push the fuse holder ends  
together. Then turn either end  
clockwise.  
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SPECIFICATIONS  
RECEIVER  
Frequency Coverage ................All 40 CB Channels (Class D) 26.965–27.405 MHz  
Sensitivity for 10dB S/N ...................................... 0.5 mV or better for 10 dB S+N/N  
Adjacent Channel Rejection .........................................................–40db (at 10 kHz)  
Audio Output .................................................................................................. 1 Watt  
Cross Modulation ............................................................................................ 50 dB  
Squelch ................................................................. Adjustable from 0.7 mV to 1 mV  
TRANSMITTER  
Frequency Coverage ................All 40 CB Channels (Class D) 26.965–27.405 MHz  
Frequency Tolerance ................................................................................... 0.005%  
Output Power ............................................................................ 4 Watts (Maximum)  
Spurious Emission ........................................................................................ –60 dB  
Type of Modulation .............................................................................................. A3  
Modulation Capability ....................................................................................... 90%  
Antenna Impedance ................................................................................... 50 Ohm  
GENERAL  
Power Requirements .............................................13.8 Volts DC, Negative Ground  
120 V AC, 60 Hz, using an optional power supply (Cat. No. 22-504)  
Dimensions (HWD) ...........................15/8 × 51/2 ¥ 67/8 inches (41.5 ¥ 140 ¥ 175 mm)  
Weight ............................................................................................. 26.4 oz (750 g)  
Included Accessories ................................ Microphone Holder, Mounting Hardware  
Specifications are typical, individual units might vary. Specifications are subject to  
change and improvement without notice.  
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Limited Ninety-Day Warranty  
This product is warranted by RadioShack against manufacturing defects in material and workman-  
ship under normal use for ninety (90) days from the date of purchase from RadioShack company-  
owned stores and authorized RadioShack franchisees and dealers. EXCEPT AS PROVIDED  
HEREIN, RadioShack MAKES NO EXPRESS WARRANTIES AND ANY IMPLIED WARRANTIES,  
INCLUDING THOSE OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE,  
ARE LIMITED IN DURATION TO THE DURATION OF THE WRITTEN LIMITED WARRANTIES  
CONTAINED HEREIN. EXCEPT AS PROVIDED HEREIN, RadioShack SHALL HAVE NO LIABIL-  
ITY OR RESPONSIBILITY TO CUSTOMER OR ANY OTHER PERSON OR ENTITY WITH RE-  
SPECT TO ANY LIABILITY, LOSS OR DAMAGE CAUSED DIRECTLY OR INDIRECTLY BY USE  
OR PERFORMANCE OF THE PRODUCT OR ARISING OUT OF ANY BREACH OF THIS WAR-  
RANTY, INCLUDING, BUT NOT LIMITED TO, ANY DAMAGES RESULTING FROM INCONVE-  
NIENCE, LOSS OF TIME, DATA, PROPERTY, REVENUE, OR PROFIT OR ANY INDIRECT,  
SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, EVEN IF RadioShack HAS BEEN AD-  
VISED OF THE POSSIBILITY OF SUCH DAMAGES.  
Some states do not allow the limitations on how long an implied warranty lasts or the exclusion of in-  
cidental or consequential damages, so the above limitations or exclusions may not apply to you.  
In the event of a product defect during the warranty period, take the product and the RadioShack  
sales receipt as proof of purchase date to any RadioShack store. RadioShack will, at its option, un-  
less otherwise provided by law: (a) correct the defect by product repair without charge for parts and  
labor; (b) replace the product with one of the same or similar design; or (c) refund the purchase  
price. All replaced parts and products, and products on which a refund is made, become the prop-  
erty of RadioShack. New or reconditioned parts and products may be used in the performance of  
warranty service. Repaired or replaced parts and products are warranted for the remainder of the  
original warranty period. You will be charged for repair or replacement of the product made after the  
expiration of the warranty period.  
This warranty does not cover: (a) damage or failure caused by or attributable to acts of God, abuse,  
accident, misuse, improper or abnormal usage, failure to follow instructions, improper installation or  
maintenance, alteration, lightning or other incidence of excess voltage or current; (b) any repairs  
other than those provided by a RadioShack Authorized Service Facility; (c) consumables such as  
fuses or batteries; (d) cosmetic damage; (e) transportation, shipping or insurance costs; or (f) costs  
of product removal, installation, set-up service adjustment or reinstallation.  
This warranty gives you specific legal rights, and you may also have other rights which vary from  
state to state.  
RadioShack Customer Relations, Dept. W, 100 Throckmorton St., Suite 600, Fort Worth, TX 76102  
We Service What We Sell  
3/97  
RadioShack  
A Division of Tandy Corporation  
Fort Worth, Texas 76102  
811081220B  
6A8  
Printed in China  
 

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