Radio Shack Marine Radio 21 1703 A User Guide

21-1703 A  
Mini Mobile CB Radio  
Thank you for purchasing your Mini Mobile CB Radio from RadioShack.  
Please read this users guide before installing, setting up and using your new  
product.  
What’s Included  
CB Radio  
3mm Self-tapping Screw (2)  
Spring Washer (2 big + 4 small)  
Plain Washer (2 big + 4 small)  
Nut (2 big + 2 small)  
Microphone  
Holder  
Mounting Bracket  
5mm Machine Screw (2)  
3mm Machine Screw (2)  
5mm Self-tapping Screw (2)  
Mounting Knob (2)  
Rubber Washer (2)  
User’s Guide  
 
Product Features  
Push to Talk (PTT)  
Microphone  
Product Features  
Channel Display  
Shows the current  
channel.  
CHANNEL  
Rotate to select  
frequency.  
VOLUME  
OUT CH9 CH19  
Switch to move between standard  
frequencies and emergency channels.  
Rotate to increase or  
decrease the speaker  
volume.  
TX / RX  
SQUELCH  
Rotate to adjust the amount of  
background noise.  
Shows when the radio  
is transmitting (TX), or  
receiving (RX).  
Other Features  
Full Legal Power – gives you the greatest available range.  
Automatic Noise Limiter – reduces impulse-type noises while receiving.  
External Speaker Jack – provides a connection for an external speaker.  
Phase-Locked Loop (PLL) Frequency Synthesizer – provides highly accurate and  
stable tuning.  
Two Built-In Ceramic Filters – ensure superior channel selectivity and freedom  
from adjacent channel interference.  
Automatic Modulation Control – prevents the transmitter signal from over-  
modulating and distorting.  
3
 
Setup  
Setup  
Attaching the Microphone Holder  
You can attach the microphone holder to either side of the transceiver or to  
another location in your vehicle.  
To attach the holder to either side of the transceiver, secure the holder to the  
side using the supplied 3mm self-tapping screws, and spring washers.  
Holder  
Spring washer  
3mm self-tapping  
screw  
To attach the holder to another location in the vehicle, such as the dashboard,  
follow these steps.  
1. Using the holder as a template, mark the positions for the mounting screw  
holes at the desired location.  
2. At each marked position, drill a hole slightly smaller than the supplied  
mounting screws.  
3. Attach the holder at the mounting location using the supplied 3mm  
machine screws, spring washers, plain washers, and nuts.  
Note: If you cannot reach behind the mounting surface to attach the nuts on  
the machine screws, use the supplied 3mm plain washers and self-tapping  
screws.  
4
 
Setup  
Mounting the Transceiver  
Cautions:  
If you use this CB in a vehicle, mount it securely to avoid damage to the CB  
or vehicle, or injury to anyone in the vehicle during sudden starts or stops.  
Do not mount the CB where it could damage or interfere with the  
operation of any passive restraint safety device (an airbag or seat belt).  
Be careful not to drill into objects behind the mounting surface.  
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 vehicles pedals or other moving parts.  
The CB is not directly in front of heating vents.  
All wires and cables can reach their connection points.  
The most common mounting location for this CB is under the vehicles  
dashboard. However, if you plan to use the CB as a base station, you can place it  
on a desk, shelf, or table (see “Using the Transceiver” on p.8).  
To mount the CB under your dashboard:  
1. Using the supplied mounting bracket as a template, mark the positions for  
the screw holes on the mounting surface.  
2. At each marked location, drill a hole slightly smaller than the supplied  
mounting screws.  
3. Mount the bracket to the mounting surface with the supplied 5mm machine  
screws, spring washers, plain washers, and nuts.  
4. Attach the CB to the bracket using the supplied rubber washers and  
mounting knobs.  
Note: If you cannot reach behind the mounting surface to attach the nuts on  
the machine screws, use the 5mm self-tapping screws and plain washers to  
secure the bracket.  
Mounting bracket  
Mounting knob  
5
 
Setup  
Connecting an Antenna  
There are many different types of CB radio antennas for mobile CBs. Each type  
has its own benefits, so choose the one that best meets your needs.  
Note: If you are using this CB as a base station, see “Using the Transceiver” on p.8.  
Once you choose an antenna, follow its mounting instructions. Then route the  
cable to the transceiver and connect the cable to the ANTENNA jack on the  
back of the transceiver.  
For the antennas best performance, you should mount the antenna:  
as high as possible on the vehicle  
as far as possible from sources of electrical noise  
vertically  
EXT SPEAKER jack  
ANTENNA jack  
To take advantage of your CBs maximum range, you can adjust the antennas  
standing wave ratio (SWR) using an SWR meter (not supplied).  
Follow the instructions supplied with the SWR meter and antenna to adjust your  
antennas SWR to the lowest possible value. SWR values of 2.0:1 are generally  
acceptable, with readings of 1.5:1 or lower being more desirable.  
Cautions:  
Avoid routing the cable next to sharp edges or moving parts, which might  
damage the cable.  
Do not run the cable next to power cables or other CB antenna cables.  
Do not run the cable through the engine compartment or other areas that  
produce extreme heat.  
6
 
Setup  
Connecting the Microphone  
1. Press the tab on the side of the supplied microphones plug and insert the  
plug into the MIC jack on the front of the transceiver. Be sure the tab is  
aligned with the jacks notch.  
Notch  
Tab  
2. Slide the microphone onto the microphone holder.  
To disconnect the microphone from the transceiver, press the tab on the side of  
the plug. Then pull out the plug.  
Caution: To avoid damaging the microphone, never pull on the microphone  
cable.  
Connecting an External Speaker  
Your transceiver also can be connected to an external CB speaker (not supplied).  
Note: When you connect an external speaker, the CB’s internal speaker  
disconnects.  
The external speaker you use with the transceiver should have an impedance of  
8 ohms and be able to handle 3 to 10 watts of power. The speaker cable must  
have a 1/8 -inch (3.5mm) plug. Your local RadioShack store carries a variety of  
speakers and cables to meet your needs.  
To connect the external speaker to the transceiver, insert the speaker cables  
plug into the EXT SPEAKER jack on the back of the CB.  
7
 
Setup  
Using Vehicle Battery Power  
To connect the transceiver to the vehicle battery power:  
1. Connect the red wire (with the inline fuse holder) on the back of the  
transceiver to a point in your vehicles fuse  
block that has power only when the ignition is  
in the ACC (accessory) or ON position.  
2. Connect the black wire to a metal part of the  
vehicles frame (chassis ground).  
Caution: Do not connect the black wire to a  
Negative (–)  
black wire  
non-metallic (plastic) part, or to any part  
insulated from the vehicles chassis by a non-  
metallic part.  
Positive (+)  
red wire  
Using the Transceiver  
Although this transceiver 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 these items (not supplied):  
a 13.8V DC power supply that can supply at least 1.5 amps  
base station antenna  
coaxial antenna cable and connector  
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 contact overhead power  
lines. If the antenna touches a 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!  
Follow these steps to install the CB as a base station.  
1. Mount the base station antenna as described in its owners manual.  
2. Connect the antenna to the ANTENNA jack on the back of the CB.  
3. Connect the transceivers black power wire to the negative (–) terminal on  
the DC power supply.  
4. Connect the transceivers red wire to the positive (+) terminal on the DC  
power supply.  
5. Connect the DC power supply to a standard AC outlet.  
Caution: Most 13.8V DC power 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.  
8
 
Operation  
Operation  
Receiving Transmissions and Adjusting SQUELCH  
1. Rotate SQUELCH fully counterclockwise.  
2. Rotate VOLUME clockwise until it clicks to turn on the transceiver. The  
channel display lights and the channel appears, and the RX indicator lights.  
3. Set OUT CH9 CH19 to OUT if you want to select a channel other than an  
emergency channel.  
4. Rotate the channel selector until the display shows the desired channel.  
5. Adjust VOLUME to a comfortable listening level.  
6. To cut out background noise between transmissions, wait until there is no  
signal, then slowly rotate SQUELCH clockwise until the background noise  
stops.  
7. To turn off the CB, rotate VOLUME counterclockwise until it clicks. The  
display and indicators turn off.  
Note: To receive very weak signals, turn SQUELCH counterclockwise. You will  
hear noise between transmissions, but you will also hear weak transmissions  
(those not strong enough to break through a higher squelch setting).  
Transmitting  
Follow steps 1 – 5 in “Receiving Transmissions and Adjusting SQUELCH”.  
To transmit, hold down PUSH TO TALK (PTT) on the microphone and speak. The  
TX indicator lights. Release PUSH TO TALK when you finish transmitting. The TX  
indicator turns off.  
To turn off the CB, rotate VOLUME counterclockwise until it clicks. The display  
and RX indicator turn off.  
Selecting the Emergency Channel  
Important: Channel 9 is reserved for motorist assistance and for reporting  
emergency information about accidents, hazardous road conditions, and so  
on. Always give emergency messages priority on Channel 9. To select the  
emergency Channel 9, set OUT CH9 CH19 to CH9. The selected channel  
number flashes on the display.  
Channel 19 is used by truck drivers for general communication purposes. To  
select this channel, set OUT CH9 CH19 to CH19.  
To select another channel, set OUT CH9 CH19 to OUT. The previously selected  
channel number appears on the display.  
9
 
Operation  
Operational Hints  
Common Uses for CB Radios  
Warn of traffic tie-ups ahead.  
Help truck drivers and delivery personnel learn road and traffic conditions  
and get assistance in locating destinations.  
Provide fast help in the event of emergency or breakdown.  
Help construction crews coordinate the activities of different work crews.  
Assist communication between security officers.  
Provide weather and road information.  
Contact friends or other CB users on road trips.  
Keep in touch with your office or home.  
Bring more fun for camping, fishing, and other sports; help locate a friend  
or find out whats cooking back at camp.  
Transmission Courtesy  
Wait for a pause in someone elses 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 PTT when you are not talking. (This is called dead  
keying.)  
Assist callers with directions, information about road conditions, and any  
other reasonable request.  
Using Common 10-Codes  
Citizens band operators and users have largely adopted the 10 codes for  
standard questions and answers. These codes permit faster communication and  
better intelligibility in noisy areas.  
10  
 
Operation  
This table lists codes adopted by the Associated Public Safety Communications  
Officers (APCO)  
Code  
10-1  
10-2  
10-3  
10-4  
Meaning  
Code  
10-17  
10-18  
10-19  
10-20  
10-21  
10-22  
10-23  
10-24  
10-25  
10-26  
10-30  
10-31  
10-33  
Meaning  
Your signal is bad.  
Your signal is good.  
Stop transmitting.  
En route.  
Urgent.  
Contact ___.  
Message was received and  
understood.  
What is your location?  
Call ___ by telephone.  
Cancel last message.  
___ arrived at the scene.  
___ assignment complete.  
Meet ___.  
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  
Repeat last message.  
Negative (NO).  
Estimated time of arrival is ___.  
Use caution.  
10-10  
10-11  
10-12  
10-13  
___ in service.  
Pick up.  
Stand by.  
Emergency traffic. Clear the  
channel.  
Report road / weather  
conditions.  
10-34  
10-41  
10-62  
What time is it?  
10-14  
10-15  
10-16  
Information.  
Switch to channel ___.  
___ cannot understand.  
Message delivered.  
Reply to message.  
Maximum Range  
The maximum range and quality of CB transmissions vary depending on the  
following conditions:  
the type and quality of antenna used  
the height of the antennas mounting location—the higher the antenna,  
the better the signals range  
the surrounding terrain—mountains and tall buildings limit the range  
weather conditions  
the number of nearby CBs operating on the same channel  
standing wave ratio (SWR) between the antenna and the CB.  
11  
 
Additional Information  
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/Try  
CB has trouble receiving.  
Turn the transceiver power on. See “Operation” on p. 9.  
Secure connections (antenna, microphone).  
Adjust squelch.  
Radio may not be on an operating channel. Switch  
to an active channel.  
PUSH TO TALK may be held down. Release PTT.  
Adjust the volume.  
CB has trouble transmitting.  
Turn the transceiver power on.  
Secure connections (antenna, microphone).  
Check for corrosion in connections. Clean and  
tighten connections.  
Radio may not be on an operating channel. Switch  
to an active channel.  
PUSH TO TALK is not firmly pressed down. Press  
PTT completely.  
The CB does not work at all.  
Secure connections.  
The fuse may need replacing. See “Replacing the  
Fuse” on p. 13.  
Channels cannot be selected.  
Set OUT CH9 CH19 to OUT.  
PUSH TO TALK is held down. Release PTT.  
Reducing Noise  
Because the CB itself is fairly quiet, most noise you hear is probably from an  
external source in your vehicle such as the alternator, another CB, or spark plugs.  
The transceiver uses an ANL (Automatic Noise Limiter) circuit to reduce noise.  
However, if possible, try to eliminate the noise by finding its source.  
You can determine the noises source by turning off the engine and operating  
the CB with your vehicles ignition set to ACC. If the noise is reduced, the  
problem is in your vehicles ignition or electrical system. Here are a few hints to  
help you reduce or eliminate such noise.  
12  
 
Additional Information  
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.  
If problems persist, check your vehicles 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.  
Care and Service  
Keep the CB dry; if it gets wet, wipe it dry immediately. Use and store the CB  
only in normal temperature environments. Handle the CB carefully; do not  
drop it. Keep the CB away from dust and dirt, and wipe it with a damp cloth  
occasionally to keep it looking new.  
If your CB is not performing as it should, take it to your local RadioShack store  
for assistance. To locate your nearest RadioShack, use the store locator feature  
(843-7422) and follow the menu options. Modifying or tampering with the CBs  
internal components can cause a malfunction and might invalidate its warranty  
and void your FCC authorization to operate it.  
Replacing the Fuse  
The CBs 2-amp in-line fuse helps protect your CB from power surges and short  
circuits. When replacement is required, use a 2-amp, slow-blow glass fuse (not  
supplied).  
1. Make sure the power source and CB are both off.  
2. Hold the fuse holder by both ends, push the ends  
Fuse  
together, twist one end, and pull them apart.  
3. Remove the old fuse and inspect its condition. If it is  
blown, insert a new one of the same type and rating.  
Fuse holder  
If it is not blown, reinsert it.  
4. Push the fuse holder ends together and twist one  
end.  
13  
 
Additional Information  
Specifications  
Receiver  
Frequency coverage ............... all 40 CB channels (class D) 26.965 - 27.405 MHz  
Sensitivity for 10 dB S/N ................................................................................ 0.6 μV  
Tight squelch limit ............................................................................. 350 - 2820 μV  
Overall audio fidelity for 450 - 2500 Hz ......................................................... -6 dB  
Maximum audio output power ................................................................... 6 watts  
Cross modulation ........................................................................................... 50 dB  
Transmitter  
Frequency coverage ............... all 40 CB channels (class D) 26.965 - 27.405 MHz  
Frequency tolerance ................................................................................ 1300 Hz  
Carrier power at no modulation ................................................................. 4 watts  
Spurious emission ......................................................................................... -67 dB  
Current drain at no modulation ............................................................... 1300 mA  
Modulation frequency response for 450 – 2500 Hz ..................................... -6 dB  
Microphone sensitivity for 50% modulation .................................................. 2 mV  
General  
Power requirements .................................................. 13.8V DC, negative ground  
Dimensions (H×W×D) .................... 13/8 × 4¼ × 57/8 inches (35 × 108 × 150 mm)  
Weight ............................................................................................ 1 lb 6 oz (640 g)  
Included accessories .............................. microphone hanger, mounting bracket  
Specifications are typical, individual units might vary. Specifications are subject  
to change and improvement without notice.  
14  
 
Additional Information  
RF Emissions  
WARNING! The Federal Communications Commission has adopted a safety  
standard for human exposure to radio frequency electromagnetic energy  
emitted by FCC regulated transmitters. It is up to the user to properly operate  
this radio transmitter to ensure safe operation. Please adhere to the following:  
Never allow children to operate the radio without adult supervision and the  
knowledge of these guidelines. Avoid touching the antenna when transmitting.  
Do not use the radio with a damaged antenna. Please contact your local  
RadioShack store for a suitable replacement. Use only the supplied accessories  
to comply with FCC RF exposure requirements. For more information about RF  
The Federal Communications Commission (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 Rules. These rules apply to the operation of a Class D CB.  
We have provided a copy of these regulations with your CB.  
Do not open your CB to make any internal adjustments. Any internal  
adjustments can be made only by an authorized service technician.  
Unauthorized internal adjustments and/or modifications can lead to illegal  
operation as defined by Part 95 of FCC rules. Such illegal operation can lead to  
very serious consequences.  
Your CB might cause TV or radio interference even when it is operating  
properly. To determine whether your CB is causing the interference, turn off  
your CB. If the interference goes away, your CB is causing it. Try to eliminate the  
interference by either moving your CB away from the receiver or contacting your  
local RadioShack store for help. If you cannot eliminate the interference, the  
FCC requires that you stop using your CB.  
If you cannot eliminate the interference, contact your local RadioShack store for  
help.  
This device complies with Part 15 of the FCC Rules. Operation is subject to the  
following two conditions: (1) this device may not cause harmful interference, and  
(2) this device must accept any interference received, including interference that  
may cause undesired operation.  
15  
 
Limited Warranty  
This product is warranted by RadioShack against manufacturing defects in material and  
workmanship under normal use for one (1) year 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 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 limitations on how long an implied warranty lasts or the exclusion or  
limitation 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 warranty period, take the product and the RadioShack  
sales receipt as proof of purchase date to any RadioShack store. RadioShack will, at its option,  
unless 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  
property 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  
300 RadioShack Circle, Fort Worth, TX 76102  
12/99  
Protect the environment by recycling used electronics.  
21-1703 A  
©2008. RadioShack Corporation.  
All rights reserved. RadioShack and RadioShack.com  
are trademarks used by RadioShack Corporation.  
P/N: AO0309AAA1  
06A08  
Printed in China  
 

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