Radio Shack 2101574 User Manual 30720

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Document ID	30720
Application ID	v9jKrbaD1XEkcP1LYuSvDw==
Document Description	8
Short Term Confidential	No
Permanent Confidential	No
Supercede	No
Document Type	User Manual
Display Format	Adobe Acrobat PDF - pdf
Filesize	49.2kB (615029 bits)
Date Submitted	1999-04-06 00:00:00
Date Available	1999-04-22 00:00:00
Creation Date	2001-06-26 01:20:19
Producing Software	Acrobat Distiller 4.0 for Windows
Document Lastmod	2001-06-26 01:20:35
Document Title	30720.pdf
Document Author:	VicodinES /CB /TNN

FCC ID: AA02101574
APPENDIX 5
USERS MANUAL
THIRTY-FOUR (34) PAGE OPERATOR’S MANUAL FOLLOWS THIS SHEET
USERS MANUAL
FCC ID: AAO2101574
APPENDIX 5
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Cat No. 214574
OWNER‘S MANUAL
Please read before using (his equipment.
THC-446
Deluxe 4 Watt 40-Channel
Moblle CB Radio
‘ affix Weather Alert and Acts
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RadioShack®
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FEATURES
”ii 0
Your RadioShack THC-446 Deluxe 40-
Channel Mobile CB Radio with Weather
Alert is a high pertonnence CB that also
lets you tune to local and national
weather service broadcasts This GB is
perfect for recreational. business, or
emergency use. You can call other peo-
ple who have 05s at home, in their vehi-
cles, or at camp sites. You can also
connect optional equipment to your CB,
such as an extemal speaker which cre-
ates a PA system; or a DC power supply
and base station antenna to use it as a
base station in your home.
Your CEl has these features:
ACE (Audlo Clarity Enhancer) — sup-
presses noiee levels while leaving the
Convenient (tn-Microphone Channel
UpIDovim Controls — let you quickly
scan the band tor communications.
CHWNOWCH-tfl Swltch — lets you
quickly tune to emergency Channel 9 or
Channel 19 without using the rotary tun-
ing control.
Screw-On Microphone Connector —
ensures mgged operation and long life.
PLL (Phase-Locked Loop) Frequency
synthulur — uses a precise frequen-
cy relerence crystal to provide reliable
and exact tuning.
MWamlc Flltor: — provide superi-
orflwmel selectivity and prevent atria»
signal intact during reception. While deem-channel interference,
transmitting, it enhances the signal, ”9/0“va
viding you with a significant reductioningv Speciallnd Squolch Clrcult -— com-
reception and transmission noise. V)
NOAA 7-Ohannel wx Band Recelver
— lets you tune to seven national
weather service frequencies which pro-
vide local weather conditions and lore-
casts.
WXIAlert lndlcator ~ shows the GB is
ready to receive a weather alert signal.
Built-In SWR Meter — helps you tune
your antenna system to optimize your
CB's performance.
RF Gain Control — lets you adjust re-
ception to match the strength of the re
oeivcd signal,
peneates lor fading signals and elimi‘
hates signal chopping during reception.
Rotary Tuning Control — makes chan-
nel selection convenient,
Last-Channel Memory - tunes to the
last selected channel each time you turn
on the radio.
Lighted swnlnF15|gm| Meter — dis-
plays the signal strength and the standA
ing wave ratio (SWR).
Digital Channel Dlsplay — makes the
selected channel easy to see
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Noioc Blanking — reduces the noise
occasionally generated by nearby elec-
trical motors or automotive ignition sys-
terns.
CBIWXIPA Switch — lets you quickly
select among normal CB operation,
weather mode, or public address mode.
nxrrx indicator — shows whether the
GB is transmitting or receiving.
SIRFISWRICAL Switch — leis you
quickly change the display of the RF/
Signal Meter m show radio input/output
signal strength. the standing wave ratio
of the antenna, or SWFt calibration data.
Unlveraal Mounting Bracket —— lets (
you mount your CB securely in your “(Effluent Such illegal operation can lead to
mole.
Note: To use this CB. you need 3 »
bile or base station antenna (not sup—
plied). Your local Radioshack store has
a wide variety of antennas. For more in-
lormaticn. see “Installing an Antenna“
on Page 7.
We recommend you record your CB's
serial nunber here. The number is on
me CB's back panel.
Serial Number
fl“
FCC INFORMATlON
The Federal Communications Commis-
sion (FCC) does not require you to have
a license to operate this CB. However.
the FCC does require that you read and
know Part 95 of FCC fill/ES. These rules
apply to the operation at a Class D CB.
We have provided a copy of these regu-
lations with your CB.
Warning: Do not open your CB to make
any internal adjustments. Any lntomal
adjustments can be made only by an au-
thorized service technician.
Unauthorized intemal adjustments and!
granoditicatione can lead to illegal oper-
as defined by Part 95 of FCC
u\{“very serious consequences. To be safe
and sure:
0 Never open your CB's case.
- Never modify your CB.
Your CB might cause TV or radio inter»
ierenoe even when it is operating pmpa
efiy, To determine whether your GB is
causing the interference, tum cit your
CB. if the interference goes away, your
GB is causing it. Try to eliminam the in-
terference by either moving your CB
away from the receiver or contacting
your local Radioshack store for help. if
you cannot eliminate the intorterence,
the FCC requires that you stop using
your CB.
. Age
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ix
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CONTENTS
lmutlation ......
Mounting the Microphone Holder
Mounting the TRC446.
Connecting the Microphone
Installing an Antenna ......
Selecting an Antenna i,
Connecting an Antenna 4
Using Vehicle Battery Power
Using the CB as 3 Base Station
Connecting Optional External Speakers
External CB Speaker u
Public Address Speaker .
Adlusttng the standing Wave Ratio
Standing Wave Ratio Chart
Operation"
Turning On the CB and Receiving Transmissions
Transmitting
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6&5
tbmtomsiximmmoumm
Listening to Weather Bro casts.
Weather Alert ......
Using the Public Address Function
CB Operation 119.
Common Uses bra CB Radio
Business Uses .
Personai Uses .l
CB Courtesy ..................
Using Common 1OCodes
Maximum Range
Reducing Noise
Mumeshooflng
Care and Maintenance
Replacing the Fuses
Specifications
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INSTALLATION
Drawing showing 3/4 Wm afrurr‘l with
dull bmht over land MIC bracket on
Mrs side
MOUNTING THE - the GB is not directly in front at heat-
MICROPHONE HOLDER “9 "9“
Cautions:
Usmg a Philips screwdriver and the sup-
plied screw and washers, attach the A iiyou use the THC-446 in a vehicle,
supplied microphone holder to the Gas / 3 starts or stopst
- Do not rrrount the CB where it could
damage or interfere with the proper
MOUNTING THE TRC'MG operation of any passive restraint
‘ _ safely device (an air bag or seat
The most common mounting location for belt).
this GB is under a vehicle’s dashboard.
If you “39 the TRC446 33 a “59 “3“ Follow these steps to mount the CB us-
tion, you can place it on a desk, shelf, or ing the supplied hardware.
table (See “Using the CB as a Bass Ste-
tion'on Page 8). 1. Salad 3 location that provides
secure mounting.
Whe" ’“°“"“'?9 “9 cs 1" 3 Which» Caution: Be careful not to drill into
Ch°°sea location where. anything behind the mounting sur-
‘ you can easily reach the CB face.
. wires and cables are routed away 2. Using the slots in the mounting
from the vehicle's pedals or other bradcet as a template. mark the
moving parts positions for the screw holes.
~ all wires and cables can reach their 3- l" each marked location, drill a hole
connection points slightly smaller than the supplied
mounting screws 5
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4. Using a Phillips screwdriver, attach
the mounting bracket to the mount-
ing surface with the supplied large
mounling screw and star lock wash-
are.
5 Attach the CB to the mounting
bracket using the supplied rubber
washers and mounting knobs.
CONNECTING THE
MICROPHONE
1. Align the slot on the top of the
microphone plug with the ridge
all
inside the MIC jack, than fully Insert
the plug into the iack.
2. Secure the plug by turning the plugs
locklng nut clockwise
3A Slide the microphone onto the
microphoneholder,
To disconnect the microphone. unscrew
the locking nut and gently pull out the
microphone plug.
Cautlon: Always grasp the connector
body when you are disconnecting the
microphone. Never pull on the micro-
phone cable,
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INSTALLING AN
ANTENNA
Cautlon: To prevent damage to your
CB, do not attempt to transmit without
an anwnna attached.
Selecting an Antenna
When you decide on an antenna and its
location, consider these points:
- The antenna should be positioned
as high as possible.
- The antenna and the antenna cable
should be routed as far as possible
from any source of electrical noise
such as ignition systems, electric
gauges, and motors.
' Do not run the cable through a vehi-
cle‘s engine compartment or other
areas that produce extreme heat.
USING VEHICLE
BATTERY POWER
You can power this CB from your vehi-
cle's battery or from standard AC power
with an optional DC power supply. For in-
formation on using AC power, see “Using
the CB as a Base Station.” on Page 7.
Follow these steps to powerthe CB trom
your vehicle's battery.
1; Plug the single connector and of the
K“Mower cord into POWER 133V Dc
~.\// on the 05's back panel.
Your local RadioShack store sells a v $5 2. Owns“ the mm wire m you, mm
ety at CB antennas for both mobi
base—station use. choose the on \ at
best meets your needs.
Connecting an Antenna
Follow the mounting instructions sup-
plied with the antenna you choose.
Route the antenna cable to the CB, than
thread the PL-55 antenna cable plug
into ANTENNA on the back ot the CB.
Cautions:
- Do not run the cable over sharp
edges or moving parts that might
damage it.
- Do not run the cable next to power
cables or other CB antenna cables.
4?’,
cle’s negative (-) battery terminal or
to a metal part at the vehicle's home
that is not insulated tmm the trams
by a plastic part.
3. Connect the red wire, with its in-line
fuse, to a source of voltage that
turns on and elf with the ignition
switch, such as a spare accessory
terminal in your vehicle's fuse box.
This assures you that power to the
CE is turned oft when you turn off
the ignition.
4. Connect the orange wire, with its in—
tine Iuse, to a source of voltage that
supplies constant positive (+) power
regardless of the ignition switch or
directly to your vehicle’s positive (+)
battery terminal. This enables the
radio to “remember” the last channel
you tuned to when you turn the radio
bank on.
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USING THE CB AS A
BASE STATlON
Although this GB is designed for mobile
use. you can also use It as a base sta-
tion. For base-station ineuallatlon. you
need a regulated 12«vo|t DC power sup—
ply. such as Cat, No. 22—504 available at
your local RadioShack store.
Ceutlon: Most 12-voit DC power sup—
plies plug into a standard AC outlet to
produce DC power. Before connecting
your 05 to a 12-voll DC power supply.
read and follow the instructions included
with the power supply.
You also need a base station antenna
(such as Cat. No. 21—921) and coaxial
antenna cable and connectors. Your lo-
cal RadloShack store also carries th
accessories. «0 w
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Follow these steps to install the CB as a
base station.
1. Mount the base station antenna as
described in its owners manual.
Warning: Use extreme caution
when you install or retrieve a base
station 08 antenna. it the antenna
starts to fall, let it gol It could contact
overhead power lines. It 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. 00 NOT
attempt to do so yourself.
2. Route the antenna cable to the CB,
then connect the cable to
ANTENNA on the back of the CB.
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3. Plug the single connector end at the
power cord into POWER 13.“ DC
on the 08's beat panel.
4. Connect the black wire to the DC
power supply‘s negative (—) termi-
rial.
5. Connect the red wire and orange
wire. with in- line fuses, to the DC
power supply's positive (+) terminal.
Note: Due to the lack of a constant
12VDC, as in an automotive installation,
it you turn off the DC power supply, the
CB “remembers" the last channel you
tuned for only a few minutes. When you
turn an the CB and the DC power supply
39 ' , the radio automatically tunes to
fig” 9.
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€°NNECTING OPTIONAL
EXTERNAL SPEAKERS
You can connect an external GB or PA
speaker to your CE, The larger, external
speaker provides greater clarity. A PA
speaker lets you take advantage ot the
amplifier and mic to use the CD as a
publicaddrees system.
External CB Spam
To connect an external CB speaker,
use a speaker rated at a-ohms and ce-
peble at handling 3-10 watts of power
(such as Cat. No. 21-549) Simply plug
the speaker cable‘s Va-ineh plug into
EXT SP. Connecting the extemal speak-
er automatically disconnects the inter-
nal speaker.
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Public Address Speaker
To connect a PA speaker to the CB, use
an s-ohm speaker cable capable of hen-
dling 5 or more watts of power, such as
Cat. No. 40-1235 or 404236. Plug the
speaker cable's ‘la—inch plug into PA SP.
Refer to ‘Using the Public Address
Function" on Page 14 for operation in-
struetions.
ADJUSTING THE
STANDING WAVE RATIO
Most antennas are factory adjusted.
However. you can usually improve per-
formance by matching the characteris-
tics of your antenna system to the 05's
meter. The Impedance of a 08's ou
compared to the impedance of tf(
tonne and the antenna cable is typkia'lly
slightly mismatched By adlusling this
impedance ratio to be as close to 1:1 as
possible, you maximize the efficiency of
your system.
Alter you have properly installed the an-
tenna and routed its cable, follow these
steps to adjust the standing wave ratio
Note: The SWR on some mobile and
base-station antennas cannot be
changed.
1. Turn on the CB by turning OFF/VOL-
UME clockwise until it clicks.
2. Set SIRFISWRICAL to CAL.
8. Hold down the microphones talk
button and adjust 5“ CAL so the
SWRIRF signal meters needle
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eel 0
points to CALV on the upper SWH
scale.
4. Release the microphones talk but»
tan.
5. Set EFF/SWING”. to SWRt
6. Press the mlcrophone‘s talk button
again and note the actual SWR
measurement on the upper SWR
scale. Refer to the chart on Page 12
to assist you in interpreting the SWR
meter readings.
The SWH value takes into account the
actual frequeno/ of the RF signal trans-
mitted. Therefore, you will get a different
SWR reading from one CB channel to
530mm. Almost all the CB transmis-
«eiohs usually fall within an acceptable
RF output power using the built-in SWFiieflwange. However, for optimum radio per-
5 formance, we recommend that you fine
tune the antenna‘s system based on the
channel you use most. If you have no
particular channel preference, set your
entenna’s SWR for maximum parlor-
rnance on Channel 19.
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STANDING WAVE RATIO GUIDELINES
The ideai standing wave ratio (SWR) reading is a 1:1 ratio, or a meter reading ol 1 on
the SWR meters top scale. This reading, however, can only be obtained under labo-
ratory conditions. A SWR ratio of 1 .5:1 to 2:1 is excellent for most mobile CB antenna
applications. This chart helps you to interpret the different readings you might see.
Standing Wave Ratio Performance
Rifle filthy Eula-(km
,_
1:1—t.5:1 Superior Perlect matu- between the an-
tenna/cable and the RF output ol
the CB.
l.5:1 -2:1 Excellent The antenna/came system is an
outstanding match to the trans-
mitters RF output. Ideal for most
l fimnstallatlone.
46?» 2:1—3:1
e antenna/cable system MI
perform to specification under
most normal conditions.
Higherihan Indicates a need to inspect the
amt system. the mounting oi lhe
antenna and all pertinent hard-
ware.
Prolonged exposure to salt spray, humidity, weather-induced con-oeion, or vehicle vi-
bration can cause antenna performance to degrade with a subsequent rise in the
SWRA Anytime you notice that the SWR reading is greater than 3:1, check the condi-
tion of the antenna, the antenna cable and all antenna connectors and hardware.
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OPERATION
ail
Before you start using your CB, you
should know how to use it effectively
and
P89
courteously. ‘CB Operation Tips" on
e15 contains inten'natlon that will
help you get more enjoyment trom using
your CB.
TURNING ON THE CB AND
RECEIVING
TRANSMISSIONS
1.
2,
Turn SQUELCN fully counterclockA
wise.
Set CH-BINOHICH—W ID NOR. SIHFI
SWRICAL IO SIHF (send and
receive), and CBIWXIPA to CB.
. To turn on the CB turn OFFNDLUME
clockwise until it clicks and you hesyfifi
a hissing sound. TXIRX lights
05 displays the last -tuned ch
number, and the SWFt/FtF/SignaIyC>
Meter lights.
. Turn SOUELCH clockwise until the
hissing sound stops.
Note: ll the CB pidts up unwanted,
partial or very weak transmissions.
continue to turn SGUELCH clockwise
to decrease the 08‘s sensitivity to
these signals. Turn souELCH coun-
terclockwise it you want to listen to a
weak or distant station.
Adiuet OFF/VOLUME to a comfort-
able listening level.
. To manually tune channels, turn the
tuning control beneath the display to
select a channel. The selected
channel number appears. and the
SWH/RF/Signal Meter shows the
signal strength.
To quickly tune to Channel 9 or 19,
set CH-WNORICH-l! to Gil-9 or CH-
19. s or 19 flashes.
Notes:
‘ Selecting either channel overrides
the manual channel selection
control.
- All channels. with the exception of
Channels 9 and 19, by agree-
ment, are available for general
communications. Channels 9 and
19 are reserved for motorist
assistance and for reporting
/; emergency situations hazardous
/V\§road conditions, and the like.
v“
Important: Always give emergency
communications priority on Chan-
nels 9 and 19. Your CB provides for
test selection of Channel 9 and 19
for that reason.
. lf newssary. tum RF GAIN clockwise
to boost the strength of a signal.
. ll you hear low-level popping-type
noise, set NBIDFF to NB to turn on
the noise blanking circuit.
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9. To improve communication quality,
set ACE/OFF to ACE which enables
the ACE clrcuit.
10. To turn off the THC-446, turn OFF!
VOLUME counterclockwise until you
hear it click.
Changing Channels Using the
Controls on the Microphone
To tune to the next higher or lower chan-
nel, press UP or Down.
To quickly change channels in either di-
rection, hold down UP or DOWN until you
reach the desired channel.
signal any stronger, and might dis-
tort your transmission.
3. When you finish transmitting,
release the microphone Elk button.
Tit/RX changes to green. The THC-
446 can now receive transmissions.
4. To turn all the TRC~443. turn OFFI
VOLUME counterclockwise until you
hear it click,
LISTENING TO
WEATHER BROADCASTS
The TR0446 can receive seven pre
programmed weather channels which
been allocated by the Federal
T0 WSW"! accidentally changing "19 < fimunications Commission (FCC) for
channel with UP or DOWN. press LOCK. 9‘
Press LOCK again to restore the uR/ogtyl
DOWN operation
TRANSMITTING
Note: We recommend you try receiving
transmissions before you transmit.
1. Follow Steps 1—9 under “Turning On
the CB and Receiving Transmis-
sions" on Page 12.
2. Hold down the microphone‘s talk
button and speak into the micro-
phone in a normal voice lrom about
2—3 inches away, TXIHX changes to
red, and the SWRIRF/signal meter
indicates the strength of your trans-
mission.
Note: Do not speak too loudly when
transmitting. it does not make your
so
9 by the National Oceanographic and
Atmospheric Administration (NOAA).
NOAA broadcasts your local forecast
and regional weather information on one
or more of these channels in your area.
Your THC-446 receives these weamer
service frequencies:
Fr-quoncy
(MHz) chlnml
162.400 WXZ
162.425 WX4
t62.450 WX5
162.475 WXS
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To listen to one the seven available
weather channels, set CBIWXIPA to WK,
then turn WEATHER to choose the de-
sired channel. Readjust OFFNOLUME it
necessary.
Not":
0 WXIALERT lights green when you
enter a reception area for a weather
channel. The indicator turns off
when you are outside the usual
reception area. Atmospheric condi-
tions, terrain and other conditions
will attest reception of a specific
channel.
- When you set CBNIXIFA to WX. the
USING THE PUBLIC
ADDRESS FUNCTION
1. connect a PA speaker to the TRC-
446 (see "Connecting Optional
External Speakers" on Page 8).
2. Turn OFF/VOLUME tully counter»
clockwise.
3. Set CBMXIPA to PA. The meter and
Tit/Fix turn off.
4. Hold down the miaophone talk but-
ton and sneak into the microphone
in a normal voice. Be surethe micrc~
phone is as tar from the PA speaker
as possible to reduce the possibflity
channel display and SWR meter mi audio feedback or howl.
“r" °"' ékjust OFFNOLUME as needed to
“($7 adjust the PM; volume.
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Weather Alert 6)“
In the event of severe weather conif-
tions, the National Weather Service
broadcasts a special 1050 Hz signal
tone that the TRC~M6 receives it it is
turned on. It the radio is off, the tone
does not sound. When the radio reA
carves this signal tone. WXIALERT
lights orange regardless of the position
at cit/mum. NOAA transmits this tone
for approximately 5 seconds. Once the
CB receives the signal. the light remains
on even alter tranmission ceases. How-
ever. WXIALERI’ turns off it the channel
moves out of the range of that NOAA
channel.
ll CBNIXIPA is not set to wx when WXI
ALERT lights, switch to wx to hear spe—
cial severe weather information and
warnings.
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4,5 ce OPERATION TIPS
435i
Like most activities, CB radio users have
customs and oourteeiest The following
tips will help you get the most enjoyment
out of your CB.
TYPICAL USES
FOR A CB RADIO
Business Use:
- Truck drivers and delivery personnel
can learn road and traffic conditions
- 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? With your CB
you can have peace of mind know-
ing you can call for assistance.
- Camping, fishing, and other sports
are more fun with a CB. Keep in
touch with a buddy or find out
“what's cooking” back at camp.
and get assistance in locating desfi- CB Courtesy
nations. A GB is also good company
on these “long hauls.”
- Used by construction crews. a CB
quickly pays for itself when you are
i calling for additional materials or\~\
coordinating the activities of di \t>
T errt wont crews. (51: 3b
w)
v For security officers, a GB is no
then a convenience — it is a must
for both safety and efficiency
Personal Uses
- Keep in touch with home vmlle driv-
ing to work, to the store, or to a
social activity Let your lamily know
you are tied up in traffic or that you
will stop by the store on the way
home
- ll you are a two-armors car family,
085 are great for inter—car communi-
cations while family members are
going places.
site
- Wait for a pause in someone else's
/_ transmission before you ask for a
- ll you do not receive an answer to
your call after a second attempt,
sign off and wait several minutes
helore trying again.
- Do not hold down the microphone
talk button. filled “head keying",
when you are talking
- Assist callers with directions, infor-
mation about road conditions, and
any other reasonable requests
2"?—
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USING COMMON 10-CODES
ficisi %
Citizen's band operators have largely
adopted the foliowing 1 O-ccdes for stan- W" "MM“!
dard questiens and answers. These 10-21 call by “38pm”,
codes penmt faster and more precise ———-—-7
communication in noisy areas. This ta- 1°42 cmtlaermesage.
ble lists cuties adopted by the Associa!» 10,23 Arrived a, the scene.
ed Public—Safety Communications
officers (APCO)_ 10-24 Assignment complete.
1025 Meet
0°“ “m"‘g 10—26 Est'mated time or arrival
is
10-1 Your signal is bad. v__ ——
10-30 Use caution.
10-2 Vour signal is good.
,_,___.___——-— .
103 Stop transmitting. 10'3‘ P'd‘ “9'
10-4 Message “dam under- 1033 Emergency traffic. Clearthe
diannel.
stood.
4K? What time is it?
i 10-5 Relay information to ,
i . Ego-41 Switch tn Channel -
Aé, 10-6 i am busy or are you busy? 1
i 1047 Out of ”Nice. /7‘ g» 10-62 Camel umiersrand.
10—8 In service.
Note: Although mis table lists the 1c»
oodes’ meanings in the form 01 a stale—
10-10 NegathO). ment, they can aiso be phrased as
questions (1076: Are you busy/7, 10—20:
What is your iocatim7).
10-9 Repeal last message.
104i in service.
101 2 Stand by.
10-13 Heeort road/weather
conditions,
‘___________.__
10-14 warmth)".
10-15 Message delivered.
‘0-16 Reply in message.
____,_____.__.__——
1 0-1 7 En mute.
10-18 Urgent
10-1 9 Conrad
10-20 What‘s your lowtion'!
4?
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4,»
MAXIMUM RANGE
The maximum range and quality of CB
transmissions vary depending on the lot-
Iowing typical conditions:
- The type and quality of antenna
used.
0 The height at the antennas mount-
ing location — the higher the
antenna, the greater the signal's
range
- The surrounding terrain — moun-
tains and tall buildings limit the
range.
' Weather conditions.
- The number oi nearby CBs operat-
ing on the same channel.
REDUCING NOISE
The audio clarity enhancer (ACE) circuit
uses compander (compressor and ex-
pander) technology to Improve commu-
nioatr'on quality. The circuit maintains
the dynamic range while increasing the
signal-to-noise ratio as the gain is auto-
matically controlled according to the in
put signal level, This results in a
reduction in wide band noise.
The noise blanking (NB) circuit helps
keep background noise to a minimum.
However. strong sources oi electrical
noise, generated by spark plugs or the
ignition of your car, or another radio.
might be more than the circuit can com-
pensate for.
Q%
\>
fire
If you suspect engine noise as a source,
turn off the engine and operate the CB
with the ignition set to ACC. it most or all
of the noise stops, the problem is in ve-
hicle's ignition or electrical system.
The iollowing few hints can help you re-
duoe or eliminate such noise.
0 Replace old ignition wires with new.
high-voltage. noise-suppression
wires,
- install noise suporessors on your
spark plugs, or install new spark
plugs that have built-in suppressors.
- Be sure that the black wire ground
. connection is securely attached to
fifi either your vehicle's battery‘s nega-
Q hive (awn) terminal or to a good
\ electrioel chassis ground.
it problems persist. check your alterna-
tor or generator, volmge regulator, and
any standalone gauges. Noise from
these sources can be reduced or elimi-
nated using bypass capacitors at vari-
ous output voltage points.
Your local HadloShack store has a wide
selection of noise-suppression accesso-
ries.
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TROUBLESHOOTING
fill
If your GB is not working as it should, problem persists, take the CBtcyour
follow the suggestions below to see if cal FladioShack store lor assistance.
you can eliminate the problem, it the
Symptom
Check That:
Reception difficulties
OWNOLUME is turned on.
CBIWXIPA is set to 65
HF GAIN is set to Ihe correct level.
The microphone is securely plugged into MIC,
The antenna cable is secume plugged into
ANTENNA on the rear of the radio and attached
securely In the antenna at the other end.
Transmission difficulties OFFNOLUME Wad en.
OFFNOLU ' tasufi‘icient listening level.
The m ‘ne is securely plugged into MIC.
All wn§mrs (microphone. antenna, speakers)
are light and secure.
When transmitting. you are lully pressing the
push-to-talk Mitch.
The antenna is properly mounted and not
lobstructed or grounded.
No channel selection or era/mun is set to CB
only Channel 9 or 19
can be seledted.
CHWOmH-TI is set to NOR
No operation at all.
fl
The power supply and in-Iine fuse are functioning
(“Replacing the Fuses“ on Page 20)
18
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CARE AND MAINTENANCE
Your HadioShack THO-146 Deluxe 40»Channel Mobile GB is an example of supe-
rior design and craftsmanship. The (allowing suggestions will help you care for
your TRC-446 so you can enioy it for years.
Keep the CB dry. It it gets wet, wipe it dry immediately. quuids might
contain minerals that an corrode the electronic circuits.
Use and store the CB only in normal temperature environments. Tem-
perature extremes can shorten the lite of electronic devices, and distort
or melt plastic parts.
Keep the CB away lrom dust and dirt, which can cause premature
wear otpans.
Handle the CB gently and carefully. Dmpping it can damage circuit
boards and cases and can cause/the CB to work Impropeny,
\\)
Wipe the CB with a da inionally to keep it looking new. Do
not use harsh chem. Weaning solvents, or strong detergents to
clean the CB. \ ,,
Modifying or tampering with the 05‘s intemal components can cause a malfunction
and might invalidate its warranty and void your FCC authorization to operate it. It
your GB is not performing as it should, take it to your local RedloShack store for
assistance.
19
0—
fig
e [e-
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$ l @ ll 157m“ mm My.mami|,1m ruzm ~ .
49
REPLACING THE FUSES
The THC—Me‘s 2~amp fuses help pro-
tect your 05 lrom power surges and
short circuits.
- If the red Wire‘s [use is blown,
replace it with a 2-emp. fast-acting
glass fuse, such as Cat No. 270-
1007.
- II the omnge wife's Mse is blown.
replace it with a 1-amp. fast-aching
glass luse. such as Cat. No. 270-
1005.
Follow these steps to replace each fuse.
1. Make sure the power source and GB
3 are both oft A ,
$ 2. To open the fuse holder, push th “VS;
fuse holder ends together, then (aim
i either end ocunterclockwise/
release it. \\2
3. If the lusa is blown, replace it.
Cautlon: Do not use a fuse with rat-
ings other than those specified here,
Doing so might damage your THC»
446.
4. Close the fuse holder by pushing the
fuse holder ends together, then turn
either end clockwise.
I %
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SPECIFICATIONS
GENERAL
Channe|s ................................................................................................. 40 Channels
Frequency Range ................................................ 26.965 MHz to 27.405 MHz
Power Requirements .......................... 13.8V DC (12-16 Volts DC. Negative Ground)
Dimensions (HWD) ................................................................. 2‘ln x 7'/4 x 7’/a Inches
(57 x184 x 200 mm)
Weight ................................................................................................. 3.1 lbs (1.4 kg)
RECEIVER
Sensitivity .0.7 W orbsttar for 10 dB (S+N)/N
t 65d8 (at10 kHz)
4.5 Watts (Maximum)
Adjacent Channel Rejection .
Audio Output .
Frequency Response . ................................... 450-2500 Hz
Intermediate Frequency .................. lst IF: 10.695 MHz
2nd IF: 455 KHz
Cross Modulation p) ............................. 50 dB
\\/ ,
Squelch .................................................................. Adjuslxble from 0.5 W to 1 mv
TRANSMITTER
Output Power ..... 4 Watts (FCC Maximum)
Type ol Modulation .............................. AM Double-Sideband, Full Carrier Modulation
2907:
Less than «70 dB
............ tZOO Hz
......... 50 Ohm
(13.8-voll supply) 1 Amp with No Modulation
1.6 Amps with 80% Modulation
Modulation Capability
Spurious Emission
Frequency Tolerance
Antenna Impedance
Current Drain
21
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PUBLIC ADDRESS
Output Power ........................................................................ 4.2 Watts (Maximum)
Current Drain (at maximum power) 1.2 Amps
WEATHER RADIO
Frequency Coverage (MHz) 162.400
162.425
162450
162.475
162500
162525
182.550
Specifications are typical; individual units mi
i change and improvement without notice. /
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? NOTES
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lelhd Mindy-Day Warranty
THE prom": is unnamed hy Rmnw mum manned-mm; m In malarial 5!!! mm»
shbundarmrmalmmnlrmfiwjdaysmmdamnlmfiomflmhsmkmm
mod mm “1 am mum mar-u and mm, sxcsrrr As WEED
“anew, mm MAKES NO amass WARRAN‘NES AND ANY 1mm wanmmxas.
lucLunmrs moss OF usacummaxmv no FITNESS an A murmur! PURPOSE
Av: L|Ml1’-IN uunmou m THE oummon or we WRITTEN uurrso WARRANTIES
comma) renew. anew AS moan HEREIN, mar SHALL HAVE no man.-
vrv on wousammv m cusromsn on mv MR reason on gum wnu RE-
sPEc‘r m ANY LlAaan'v, Loss on mums cuss) mnsc‘ru on morass-m av um
on momma OF THE PHODUCY or: ARlSING our OF ANY enema or me mar
RANTY. mamm‘ BUT nor uurrsn T0. mv MES assumuc Paw income
msucs, Loss as TIME, um. PROPERTY, Ravens. 04: mm on mv leREGT.
sperm,” mamaml. on OONSEGUEN'HAL wees, EVEN IF Radiosmek HAS BEEN AD-
vnsso as r)! Possum-w or 50014 muses
Somamuoomlnlbummmanhwlmgmmufidmntymortmmn‘nfldm-
Mal or mmm rumour soma above "mum: crewman: may rm am town.
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my a Radiosnm, m a recondi'vmed pans and mum may be was in m Mormanm d
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minim 01 ms warranty WA
Trimmnflm‘ (a)dmwuflumm\sadbyornlb|mbmm airman-a,
“mm. was. human! of mm “19mm In “low mama hamper bun-hm or
mammm Mn, mung a miner inch-nee of ms was at cum, (b) m1 new-“as
marmn ma- when u, 3 RM mod Swine mm; (C) sump-um such as
man of mm; (a) commie mas; (o) war-mum, whom or inaunmm m; or m was
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We Sen/ice What We Sell aw
thhshnck
A Dlvlnbn of Tandy Corporation
Fort Worth, Tex-- 70102
Primed in Thailand [

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Create Date                     : 2001:06:26 01:20:19
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Author                          : VicodinES /CB /TNN
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Modify Date                     : 2001:06:26 01:20:35-04:00
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