21-170 2.fm Page 1 Thursday, August 5, 1999 1:02 PM
40-Channel Mini Mobile CB Radio
Cat. No. 21-1702
OWNER’S MANUAL
Please read before using this equipment.
TRC-502
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FEATURES
Your RadioShack TRC-502 40-Channel
Mini Mobile CB Radio is a great way to
communicate with other CB radio operators. Because of its convenient co mpact
size, you can use it just about anywhere.
You can mount it in a vehicle for mobile
use, or in your home or office for use as
a base station.
Your CB has these advanced features.
Up/Down C hannel S e lector
— lets you
easily select a channel with the press of
a button.
TX (Transmit) Indicator
— lights to
show when the CB is transmitting.
Automatic Noise Limiter (ANL) Circ uit
— reduces impulse-type noise during
reception.
5-Pin Din Mic Connector
— uses five
prongs to reinforce a clear connection
between the mic and the receiver.
Full Le
al Power
— gives you the full
range of CB channels with the maximum
allowed transmit power.
Cr
stal-Controlled Digital Tunin
—
provides precise tran smission tuni ng capability when selecting a channel.
Two Ceramic Filters
— provide superior channel selectivity and prevent adjacent channel interference.
Universal Mountin
Bracket
— lets
you mount you r CB se curely in your vehicle, or on a table or shelf in your home
or office.
External Antenna Jack
— lets you attach an optional antenna to your CB radio for increased range.
We recommend you record your CB’s
serial number here. The number is on
the bottom of the CB.
Serial Number: ___________________
Ad
ustable Squelch
— helps to elimi-
nate noise between transmissions.
Automatic Modulation
— prevents the
transmitter signal from over-modulating
and distorting.
RadioShack is a registered trademark used by Tandy Corporation.
All Rights Reserved.
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FCC INFORMATION
The Federal Communications Commission (FCC) does not require you to have
a license to operate this CB radio. However, you must know Part 95 of
Rules
. These rules apply to the operation of a Class D CB. We have provided
a copy of these regulations with your CB
radio.
Warning
make any internal adjustments. A CB radio is set u p to transmit a regulated si gnal on an assigned frequency. It is
against the law to alter or adjust t he set tings inside the unit to exceed the se limitations.
To be safe and sure:
• never open your CB radio’s cases.
• never change or replace anything in
: Do not open your CB radio to
your CB radio.
FCC
This device complies with Part 95 of
FCC Rules
following two conditions: 1) this device
may not cause harmful interference, and
2) this device must accept any i nterference received, including interference
that may cause undesired operation.
. Operation is subject to the
Your CB radio might cause TV or radio
interference even when it is operating
properly. To determine whether your CB
radio is causing the interference, turn off
your CB radio. If the interference goes
away, your CB is causing it. Try to eliminate the interference by:
• moving your CB radio away from the
TV or radio
• contacting your local RadioShack
store for help
If you can not eliminate the interf erence,
the FCC requires that you stop using
your CB radio.
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CONTENTS
Install a tion ....... ........................................................................................................ 5
Mounting the Microphone Holder ....................................................................... 5
Mounting the CB ................................................................................................. 5
Connecting an Antenna ...................................................................................... 6
Connecting the Microphone ................................................................................ 7
Using Vehicle Battery Power .............................................................................. 8
Using the CB as a Base Station ......................................................................... 8
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INSTALLATION
MOUNTING THE
MICROPHONE HOLDER
You can mount the microphone holder
to either side of the CB or to anot her location near your receiver.
Caution
phone holder where it could dam age or
interfere with the operation of any passive restraint safety device (an airbag or
seat belt).
To mount the hol der to eit her side of the
CB, use the two supplied
machine screws, plain washers, and
spring washers as shown to secure the
holder.
: Do not mount the CB micro-
1
/8-inch (3-mm)
Caution
anything behind the mounting surface.
3. Mount the holder using the machine
screws, spring washers, plain washers and nuts.
: If you cannot reach behind the
Note
mounting surface to attach the nuts to
the machine screws, use the two supplied
washers.
: Be carefu l not to drill into
Mounting Surface
1
/8-inch (3-mm) screws and plain
MOUNTING THE CB
To mount the holder near the receiver in
another location in your vehicle (such as
a dashboard), or somewhere in your
home or office, such as a nearby wall,
follow these steps.
1. Using the holder as a template,
mark the positions for the screw
holes at t he des i red location .
2. At each marked position, drill a hole
slightly smaller than the mounting
screws.
The most common mounting location for
this CB is under a vehicle’s dashboard.
However, if you use the TRC-502 as a
base station in your home or office, you
can place it on a desk, shelf, or table
(see “Using the CB as a Base Station”
on Page 8).
If you are mounting the CB in a vehicle,
choose a location where:
• you can easily reach the CB.
• wires and cables are clear of the
vehicle’s pedals and other moving
parts.
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• the CB is not directly in front of heating vents.
• all wires and cables can reach their
connection point.
Cautions:
• If you use the CB in a vehicle,
mount it securely to avoid damage
to the CB or vehicle or injury t o passengers.
• Do not mount the CB where it could
damage or interfere with the operation of any passive restraint safety
device (an airbag or seatbelt).
Follow these steps to mount the CB using the supplied hardware.
1. Using the mounting bracket as a
template, mark the positions for the
screw holes on the mounting surface.
3. Mount the bracket to the mounting
surface with the
1
/5-inch (5-mm)
mounting screws, spring washers,
plain washers, and nuts.
Mounting
Surface
Note: If you cannot reach behind
the mounting surface to attach the
nuts on the bolts, use the
1
/5-inch (5mm) mounting screws and plain
washers to secure the bracket.
4. Attach the CB to the mounting
bracket using the two rubber washers and mounting kn obs.
2. In each marked location, drill a hole
slightly smaller than the two
1
/5-inch
(5-mm) mounting screws.
Caution: Be careful no t to drill into
objects behind the mounting surface.
6
CONNECTING AN
ANTENNA
There are many different types of antennas for mobile CBs, each with its own
benefits. You can choose one that best
fits your needs. Your local Radio Shack
store sells a wide variety of antennas.
Note: If you are using this CB as a base
station, see “Using the CB as a Base
Station” on Page 8.
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When you choose a n antenna, keep in
mind that, for the bes t perfo rmance, you
should mount the antenna:
• as high as poss ible on y our vehicle,
home or building
• as far as possible from source of
electrical noise
• vertically
Once you ch oose an antenna, follo w its
mounting instructions. Then route the
cable to the CB and connect the cable to
ANTENNA
on the back of the CB.
Follow the instructions supplied with the
SWR meter and antenna to adjust your
antenna’s SWR to the lowest possible
value. SWR values of 2 .0:1 a re generally acceptable, with readings of 1.5:1 or
lower being more desirable.
CONNECTING THE
MICROPHONE
1. Press the plastic tab on the top of
the supplied microphone’s plug and
align the 5-pin DIN microphon e pl ug
with the corresponding pin holes in
the CB’s
plug into the mic jack.
Tab
2. Slide the microphone onto the
microphone holder.
MIC
jack. Then push the
Cautions
• Avoid routing the cable next to sharp
• Do not run the cable n ext to power
• Do not run the cable throu gh a vehi -
To take advantage of your radio’s maximum range, adjust the ant enn a’s S tan ding Wave Ratio (SWR) using an SWR
meter (such as Cat. No. 21-523).
:
edges or moving parts which might
damage the cable.
cables or other radio antenna
cables.
cle’s engine compartment or other
areas that produce extreme heat.
To disconnect the microphone from the
CB, press the plastic tab o n the side of
the plug, then pull out the plug.
Caution
cable.
: Never pull on the microphone
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USING V EHICLE BATTERY
POWER
Follow these steps to connect the CB to
vehicle battery power.
1. Connect the red wire (with in line
fuse holder) to a point i n your vehicle’s fuse block that has power only
when the ignition is in the ACC or
ON position.
Red Wire to
Switched ACC
Terminal
2. Connect the black wire to a metal
part of the vehicle’s frame (chassis
ground).
USING THE CB AS A
BASE STATION
Although this CB radio is designed
mainly for mobile u se, you can also use
it as a base station with an AC power
source. For base sta ti o n insta l lation, you
need these items:
• a 13.8V DC power supply that can
supply at least 1.5 amps (such as
Cat. No. 22-504)
Caution
supplies plug into a standard AC
outlet to produce DC power. Before
connecting your CB to a 13.8V DC
power supply, read and follow the
instructions included with the power
supply.
• base station antenna (such as Cat.
No. 21-969)
• coaxial antenna cable and connector (available at your local
RadioShack store)
: Most 13.8V DC power
Black W ir e to
Ground
Caution
wire to a non-metallic (plastic) part,
or to any part insulated from the
vehicle’s chassis by a non-metallic
part.
8
: Do not connect the black
Warning
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 tou ches 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
remove it yourself!
: Use extreme caution when
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Follow these steps to install the CB as a
base station.
Red Wire
to Positive
Antenna
Wire
Black Wire
to Negative
Terminal of
DC Power
Suppl
Terminal of
DC Power
Suppl
1. Mount the base station antenna as
described in it’s owner’s manual.
2. Connect the antenna to
ANTENNA
.
3. Connect the CB’s black power wi re
to the negative (–) terminal on the
DC power supply.
4. Connect the CB’s red wire to the
positive (+) terminal on the DC
power supply.
5. Connect the DC pow er supply to a
standard AC outlet.
Caution
: To prevent damage to the CB,
be sure you connect an antenna and the
microphone before you use the CB.
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OPERATION
Before you use your CB, you should
know how to use it effectively and courteously. “Operational Hints” on P age 12
contains information that will help you
get more enjoyment from our CB.
RECEIVING
TRANSMISSIONS AND
ADJUSTING SQUELCH
1. Turn
2. Turn on the CB by turning
SQUELCH
wise.
clockwise until it clicks. The channel
display lights and the channel number appears.
fully counterclock-
VOLUME
4. Adjust
tening level.
5. To cut out background noise
between transmissions, wait until
there is no signal, then slowly turn
SQUELCH
ground noise stops.
Note
turn
You hear noise between transmissions, but you also hear weak transmissions.
6. To turn off the CB, turn
counterclockwise until you hear it
click. The channel display turns off.
VOLUME
: To receive very weak signals,
SQUELCH
to a com fortable li s-
clockwise until the back-
counterclockwise.
VOLUME
3. Pressoron the base
to select the desired channel.
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TRANSMITTING
Note
: We recommend you try receiving
before you transmit.
1. Follow Steps 1–5 in “Receiving
Transmissions and Adjusting
Squelch” on Page 10.
2. To transmit, press
PUSH TO TALK
the microphone. The red TX indicator lights. Hold the microphone 2–3
inches from your m outh and speak
in a normal tone of voice.
PUSH
TO
TALK
3. To turn off the CB, turn
VOLUME
counterclockwise until you hear it
click. The channel display turns off.
on
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OPERATIONAL HINTS
Like most activities, CB radio has its
customs and courtesies. The following
tips will help you get the most enjoyment
from your CB.
COMMON USES FOR A 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.
• If you are a two-car (or more) family,
CB radios are great for communicating with family members while they
are in their cars.
• 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
assurance it is to be able to radio for
assistance!
• Camping, fishing, and other sports
are more fun with a CB radio.
Locate a buddy or find out “what’s
cooking” back at camp.
Busi ness Uses
• For security officers, a CB is more
than a convenience — it is a must
for both safety and efficiency.
• Truck drivers and delivery personnel
can learn road and traffic conditions
and get assistance in locating destinations. A CB radio is also good
company on those “long hauls.”
• On construction crews, a CB radio
quickly pays for itself when you are
calling for additional materials or
coordinating the activities of different work crews.
TRANSMISSION
COURTESY
Please follow these guidelines of radio
courtesy when using your CB.
• Wait for a pause in someone else’s
transmission before you ask for a
break.
• If you do not receive an answer to
your call after a second attempt,
sign off and wait several minutes
before trying again.
• Do not hold down
when you are not talking. (This is
dead keying
called
PUSH TO TALK
.)
12
• Assist callers with directions, information about road conditions, and
any other reasonable requests.
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USING COMMON 10CODES
Citizen’s band operators and CB radio
users have largely adopted the 10codes 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 Communica tions
Officers (APCO).
CodeMeaning
10-1Your si
10-2Your si
10-3Stop transmit ti n
10-4
10-5Relay informat ion to _____.
10-6I am busy or are you busy?
10-7Out of service.
10-8 In service.
10-9Repeat last messa
Messa
stood.
nal is bad.
nal is good.
.
e received and under-
e.
CodeMeaning
10-16Reply to message.
10-17En route.
10-18Ur
10-19Contact _____.
10-20What is your location?
10-21Call _____ by telephone.
10-22Cancel last messa
10-23Arrived at the scene.
10-24Assi
10-25Meet _____.
10-26
10-30Use caution.
10-31Pick up.
10-33
10-34What time is it?
10-41Switch to Channel xx.
10-62Cannot understand.
ent.
e.
nment complete.
Estimated time of arrival is
_____.
ency traffic. Clear the
Emer
channel.
10-10Ne
10-11_____ in servic e.
10-12Stand by.
10-13
10-14Informati on.
10-15Messa
ative (NO).
Report road/weather conditions.
e delivered.
Note:
Although this table lists the 10codes’ 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?).
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MAXIMUM RANGE
The maximum range and qua lity of CB
radio transmissions vary depending on
the following conditions:
• the type and quality of antenna used
• the height of the antenna’s mounting
location — the higher the antenna,
the better the signal’s range
• the surrounding terrain — mountains and tall buildings limit the
range
• weather conditions
• the number of nearby radios operating on the same channel
• standing wave radio (SWR)
between the antenna and the CB
Note
: Your CB radio’s transmission
range is generally line-of-sight.
You can determine the noise’s source
by turning off the engine and operating
the CB with your vehicle’s ignition set to
ACC (or ON). If the noise is reduced, the
problem is in your vehicle’s ignition or
electrical system.
Here are a few hints to help you reduce
or eliminate such nois e .
• 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 suppression
wires.
• Install noise suppressors on your
spark plugs, or install new spark
plugs that have built-in noise suppressors.
REDUCING NOISE
Because your CB is exceptionally quiet,
any noise you hear is prob ably from an
external source in your vehicle such as
an alternator, another radio or spark
plugs.
The transceiver uses an ANL (Automatic
Noise Limiter) circuit to reduce noise.
However, if possible, t ry to eliminate the
noise by finding its source.
14
• If problems persist, check your alternator/generator and regulator
gauges. You can reduce the noise
from these sources by using bypass
capacitors at the various output voltage points.
Your local RadioShack store has a wide
selection of noise suppression accessories.
21-1702.fm Page 15 Thursday, August 5, 1999 1:02 PM
TROUBLESHOOTING
If your CB is not working as it should, follow these suggestions to see if you can eliminate the proble m. If you canno t, take the CB to your local RadioShack store for assistance.
SymptomCheck/Try
CB has trouble receiving.Turn CB power on.
Microphone connected? Secure connec tions .
Antenna connected? Secure connections.
Too much squelch? Adjust as needed.
Radio not on an operating channel? Switch to an
active channel.
Adjust
CB has trouble transmitting.
Turn power on.
Antenna connected? Secure connections.
All connections free of corrosion? Clean and tighten.
Microphone connector loose? Firmly press connector
into MIC ja c k .
Radio not on an operating channel? Switch to an
active channel.
PUSH TO T ALK
Radio does not work at all. Power connected? Secure connections.
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CARE AND MAINTENANCE
Your RadioShack TRC-502 40-Channel Mini Mobile CB Radio is an example of superior design and craftsmanship. The following s uggestions 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.
Use and store the CB only in norm al temperatu re environm ents . Temperature extremes can shorten the life of electronic devices, and distort
or melt plastic parts.
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 cau se a malfunction
and invalidate its 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-502’s 2-amp in -line fuse helps
protect your CB from powe r surges and
short circuits. When replacement is required, use a 2-amp, slow-blow glass
fuse, such as Cat. No. 270-1023.
Caution
other than those specified here. Doing
so might damage your CB.
Follow these steps to replace the fuse.
1. Make sure the power source and
2. Hold the fuse holder by both ends,
3. Remove the old fuse and inspec t its
4. Push the fuse holder ends together
: Do not use a fuse with ratings
CB are both off.
push the ends together, twist one
end counterclockwise, then pull
them apart.
condition. If it is not blown, reinsert
it. If it is blown, insert a new one of
the same type and rating.
and twist one end clockwise.
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SPECIFICATIONS
RECEIVER
Frequency Coverage .................... All 40 Channels (Class D) 26.965 to 27.405 MHz
Sensitivity .................................................................... 0.5 uV or Better for 1 0 dB S/N
Squelch Sensitivity .................................. From 0.5 uV to 1 mV Adjustable (Nominal)
Frequency Response .......................................................... – 6 dB 450 Hz to 2.5 kHz
Adjacent Channel Selectivity .................................................... 45 dB at 10 kHz Away
Audio Output Power .......................................................................................... 1 Watt
Specifications are typical, individual units might vary. Specifications are subject to
change and improvement without notice.
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NOTES
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Limited Ninety-Day Warranty
This product is warrante d by RadioShac k against manu facturing def ects in material and w orkmanship under normal use for ninety (90) day s from the d ate of purch ase from Radi oShack compa nyowned stores and authorized RadioShack franchisees and dealers. EXCEPT AS PROVIDED
HEREIN, RadioShack MAKES NO EXPRESS WARRANTIES AND ANY IMPLIED WARRANTIES,
INCLUDING THOSE OF MERCHA NTA BILITY AND FITNESS FOR A PARTICULAR PURPOSE,
ARE LIMITED IN DURATION TO THE DURATION OF THE WRITTEN LIMITED WARRANTIES
CONTAINED HEREIN. EXCEPT AS P ROVIDED HEREIN, RadioShac k SHALL HAVE NO LIABILITY OR RESPONSIBILITY TO CUSTOMER OR ANY OTHER PERSON OR ENTITY WITH RESPECT 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 WARRANTY, INCLUDING , BUT NOT LIMITED TO, ANY DAMAGES RESULTING FROM INCONVENIENCE, LOSS OF TIME, DATA, PROPERTY, REVENUE, OR PROFIT OR ANY INDIRECT,
SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES, EVEN IF RadioShack HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
Some states do not allow the limitations on how long an implied warranty lasts or the exclusion of incidental or consequential damages, so the above limitations or exclusions may not apply to you.
In the event of a product defect during the wa rranty period, take the product and the Radi oShack
sales receipt as proof of purchas e date to any RadioS hack s tore. Radio Shack will, at its opti on, unless otherwise provided by law: (a) correct the defect by product repair without charge for parts and
labor; (b) replace the produc t with one of the same or similar design; or (c) refund the pu rchase
price. All replaced parts and pr oducts, and prod ucts on which a refund is mad e, become the property of RadioShack. New or reco nditioned parts and produ cts may be used in the performance of
warranty service. Repair ed or replaced parts and products are warranted for the remainder of t he
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, impr oper or abnormal usag e, failure to foll ow in struct ions, i mproper instal lation or
maintenance, alteratio n, lightning or other incidence of exce ss voltage or current; (b) any repairs
other than those provid ed by a RadioShack Authoriz ed Service Facility; (c ) consumables such as
fuses or batteries; (d) cosm etic dama ge; ( e) transpo rtation , shippi ng or ins uranc e costs ; or (f) c osts
of product removal, installation, set-up service adjustment or reinstallation.
This warranty gives you spec ific legal rights, and you ma y also have other rights which v ary from
state to state.
RadioShack Customer Relations, Dept. W, 100 Throckmorton St., Suite 600, Fort Worth, TX 76102
We Se rvi ce What We Sell
3/97
RadioShack
A Division of Tandy Corporation
Fort Worth, Texas 76102
811081350B
1A9Prin te d in China
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