Radio Shack TRC-237 User Manual
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OWNER’S MANUAL Cat. No. 21-1650
TRC-237
40-Channel 5-Watt
CB Walkie Talkie
with Channel 9/19 Priority Switch
Please read before using this equipment.
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FEATURES
Your RadioShack TRC-237 40-Channel 5Watt CB Walkie Talkie with Channel 9/19
Priority Switch is a portable, two-way radio
you can carry almost anywhere. The channel priority switch lets you quickly switch to
either Chan nel 9 to report em ergenc y situation s , or to Ch an ne l 1 9 to t ran sm i t an d r eceive information about road and traffic
conditions. You can use your TRC-237
around the house, in your office, or in your
car or boat. You c an al so use it on fishi ng
trips, or at your b usiness for superviso ry,
security, or warehouse personnel.
Your TRC-237 also has the following features:
Transmit Power High/Low Switch
—
lets you reduce the transceiver’s power
output during short-range transmissions
to save battery power.
Transmit Indicator
you press the transmit button
Modulation In dicator
—
lights whenever
.
—
lights when you
speak into the microphone. The indicator
brightens as modulation increases.
Built-In Modulation Limiter Circuit —
automatically adjusts to a variety of voice
levels to ensure a clear transmission.
PLL (Phase-Locked-Loop) Frequency
Synthesizer
—
provides reliable and ex-
act tuning.
Adjustable Squelch
— helps to eliminat e
noise between transmissions.
1997, 1998 Tandy Corporation.
©
All Rights Reserved.
RadioShack is a registered trademark
used by Tandy Corporation.
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2-Digit LED Display — lets you easily
see the selected channel number.
Automatic Noise Limiter (ANL) Circuit
— reduces noise caused by nearby electrical equipment such as motors or automotive ignition systems.
Battery Test Butto n and Battery Indica tor — lets you check the batteries’ condi-
tion to find out if they need replacing.
Flexible Antenna with BNC Connector
— provides excellent reception and t rans mission, and is designed to help prevent
antenna breakage.
Automatic Display Dimmer — the channel display automatically brightens when
you press most buttons. Then, after a few
seconds, it dims to save battery power.
Power/Charging Jack — lets you power
your TRC-237 from an AC or DC power
source, so y ou can u se t he TRC-23 7 with out draining the batteries. And, lets you
charge nickel-cadmium batteries without
removing them from the TRC-237.
Note: You need eight AA alkaline batteries or ten nickel-cadmium rechargeable
batteries (not supplied) to power your
TRC-237.
We recommend you record the TRC237’s serial numbe r here. The serial
number is located on the radio’s back
panel:
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FCC INFORMATION
The Federal Communications Commission (FCC) does not require you t o have
a license to operate this walkie talkie.
However, the FCC does require that you
read and know Part 95 of
These rules apply to the operation of a
Class D CB. We have provided a copy of
these regulat ions with your TRC-237.
Internal adjustments and/or modifications
can lead to illegal operatio n as defined by
Part 95 of
tion can lead to very serious consequences.
To be safe and sure:
• Never open your TRC-237’s case.
• Never modify your TRC-237.
FCC Rules
. Such illegal opera-
FCC Rules
.
Your TRC-237 might cause TV or radio
interference even when it is operating
properly. To determine whether your
TRC-237 is causing the interference, turn
off your TRC-237. If t he interference goes
away, your TRC-237 is causing it. Try to
eliminate the interference by:
• Moving your TRC-237 away f rom the
TV or radio
• Contacting your local RadioShack
store for help
Warning
make any internal adjustments. Any internal adjustments should be made only by
authorized ser vice personnel.
4
: Do not open your TRC-237 to
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CONTENTS
Powering the CB ................................ 6
Using the POWER Jack and
ALKALINE/NI-CD Switch .................. 6
Using Batteries ................................. 7
Testing the Battery Power .......... 10
Recharging Nickel-Cadmium
Batteries ..................................... 10
Using Vehicle Battery Power........... 12
Using AC Power ............................. 13
Connecting the Antenna ..................15
Connecting an
Optional Antenna ................ ........16
Operation .......................................... 18
Receiving Transmissions and
Adjusting Squelch ....... ................... 18
Transmitting .................................... 20
CB Operation Tips ........................... 21
Common Uses for a CB Radio ....... 21
Business Uses ........................... 21
Personal Uses ........................... 21
Using Common 10-Codes .............. 22
CB Courtesy ................................... 24
Maximum Range ......... .. .......... ....... 24
Trou bleshooting ........ ............ .. ......... 25
Maintenance ..................................... 26
Specifications .................................. 27
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POWERING THE CB
You can power your TRC-237 from any of
these sources (none supplied):
• Eight AA alkaline batteries with the
two supplied dummy batteries
• Ten rechargeable AA nickelcadmium batteri es
• 12-volt vehicle battery power using a
fused power cord
• Standard AC power using a power
supply
USING THE POWER JACK
AND ALKALINE/NI-CD
SWITCH
POWER
The
ternal power source (such as your vehicle’s battery power or AC power), or
connect a battery charger to charge
nickel-ca dmium b atter ies whi le t hey are i n
the TRC-237.
jack lets you connect an ex-
The TRC-237 also has a slide switch (
KALINE/NI
partment that you must set correctly,
depending on what power source you are
using and whether or not you want to
charge rechargeable batteries while they
are in the TRC-237.
6
CD
) inside the battery com-
-
AL-
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•Set it to
ALKALINE
before you connect an external power source (vehicle battery power or AC adapter) to
POWER
the
jack or while you are using internal batteries (alkaline or rechargeable).
•Set it to
nect a battery charger to the
NI-CD
only
when you con-
POWER
jack to charge the install ed rechargeable batteries.
Warning
: To avoid injuring yourself or
damaging the TRC-237, connect a battery charger to the
POWER
jack
only
when nickel-cadmium batteries are installed (see “ Recha rging Ni ckel-C admium
Batteries” on Pa ge 10). Neve r t ry t o recharg e non- rechargeable batteries. They
could get very hot and explode.
Note:
You can connect an external power source for power regardless of the type
of batteries yo u installed.
USING BATTERIES
You can power the TRC-237 from eight
AA alkaline batteries (such as RadioShack Cat. No. 23-552) with the two
supplied dummy batteries, or 10 rechargeable AA nickel-cadmium batteries
(such as Cat. No. 23-125).
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Cautions:
• Always us e fresh, or freshly charged,
batteries of the required size and
recommended type.
• Do not mix old and new batteries,
different types of batteries (standard, alkaline, or rechargeable
nickel-cadmium), or rechargeable
batteries of dif ferent capaciti es.
Follow these steps to ins tal l the batteries.
1. If the TRC-237 is on, turn
OFF/VOLUME
fully counterclockwi se until it clicks to
turn it off.
2. Slide the strap on the back of the
TRC-237 through the buckle and the
battery compartment cover to remove it.
3. Slide the battery compartment cover
in the direction of the arrows to
remove it.
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4. Be sure
batte ry co mpartm ent is set to
LINE
ALKALINE/NI-CD
.
inside the
ALKA-
5. Put eight AA alkaline batteries and
the two supplied dummy batteries, or
ten AA nickel-cadmium batteries into
the battery compartment, as indicated by the polarity symbols (+ and
–) marked inside.
Note
: Before you use the TRC-237
with nickel-cadmium batteries, you
need to charge the batteries (see
“Recharging Nickel-Cadmium Batteries” on Page 10).
6. Replace the battery compartment
cover and the strap on the back of
the TRC-237.
Cautions
:
• If yo u wi ll no t be p owe ring th e TRC 237 from internal batteries for several months, remove t he batteries.
• Dispose of old batteries promptly
and properly.
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