Radio Shack 21-1706 User Manual

233.31 Kb






OWNER’S MANUAL — Please read before using this equipment.



Thank you for purchasing a RadioShack 40 Channel Mobile

If an icon appears at the end of a


CB. Your CB is a great way to communicate with other CB


radio operators. You can mount it in a vehicle for mobile

paragraph, go to the side head box

use, or in your home for use as a base station.

on that page with the


corresponding icon for pertinent


To use this CB, you must connect a mobile or base station




— Signifies a



antenna. Your local RadioShack store has a wide variety of


antennas. For more information, see “Connecting an

. — Signifies a




Antenna” on Page 3.

# — SignifiesImportant text





Attaching the Microphone Holder ........


Mounting the Transceiver ...................




Connecting an Antenna ......................



Connecting the Microphone ................


You can attach the microphone holder to the right side of

Connecting an External Speaker ........


Connecting a CB Speaker ..........


the transceiver or to another location in your vehicle.

Connecting a PA Speaker ..........




Connecting the Compass ....................


To attach the holder to the transceiver, secure the holder to

Connecting an Optional


Microphone/Earphone .........................


the right side using the supplied 3 mm machine screws and

Traffic Safety



lock washer.


Using Vehicle Battery Power





Using the Transceiver




as a Base Station ................................





Using Your CB ....................................





Receiving Transmissions




and Adjusting Squelch ....................




Transmitting .....................................





Selecting the Emergency Channel ..




Using the PA Amplifier .....................




Using Monitor ..................................





Using the Compass .........................


To attach the holder to another location in the vehicle, such

Using Memory .................................



Using Last Channel Recall (RCL) ...


as the dashboard, follow these steps.

Adjusting the Backlight




Transmission Courtesy ....................


1. Using the holder as a

Using Common 10-Codes .............


Maximum Range ...........................


template, mark the

Troubleshooting ................................



positions for the

FCC Information




mounting screw

Reducing Noise .............................



Care ..................................................



holes at the desired

Service and Repair ........................




Replacing the Fuse .......................



Specifications ....................................



2. At each marked

Parts and Accessories ......................




position, drill a small


starter hole


Be careful not to drill into anything



behind the mounting surface.








© 2002 RadioShack Corporation.





All Rights Reserved.




RadioShack and are trademarks





used by RadioShack Corporation.

Transceiver the Mounting


If you use the 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 anything behind the mounting surface.


If you cannot reach behind the mounting surface to attach the nuts on the bolts or machine screws, use the supplied plain washers and self-tappingscrews.

3.Attach the holder at the mounting location using the supplied machine screws, spring washers, plain washers, and nuts.


The most common mounting location for this CB is under a vehicle’s 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 as a Base Station” on Page 6).

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 or other moving parts.

The CB is not directly in front of heating vents.

All wires and cables can reach their connection points.

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.

2.In each marked location, drill a small starter hole. .#

3.Mount the bracket to the mounting surface with the supplied 5 mm bolts, spring washers, plain washers, and nuts.

4.Peel the backings off the

adhesive on the back of the supplied rubber washers and

attach the washers to the mounting holes on the CB. Then

attach the CB to the mounting bracket using the mounting knobs.



There are many different types of CB antennas for mobile CBs. Each type has its own benefits, so choose the one that best meets your needs. Your local RadioShack store sells a wide variety of antennas.

When you choose an antenna, keep in mind that, for the best performance, you should mount the antenna: .#

as high as possible on the vehicle

as far as possible from sources of electrical noise


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.


To take advantage of your radio’s maximum range, adjust the antenna’s Standing Wave Ratio (SWR) using an SWR meter (not supplied).

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 are generally acceptable, with readings of 1.5:1 or lower being more desirable.


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 radio antenna cables.

Do not run the cable through the engine compartment or other areas that produce extreme heat.


If you are using this CB as a base station, see “Using the Transceiver as a Base Station” on Page 6.

Connecting an Antenna



Never pull on the microphone cable.





• When you connect an external






speaker, the CB’s internal





speaker disconnects.


• To avoid acoustic feedback, the





speaker should be at least 6



feet from the CB. If you



experience feedback, avoid



keying the microphone until you




have moved the speaker away



from the CB.




%100'%6+0)"6*'" /+%412*10'

1.Align the tab on the side of the supplied microphone’s plug with the notch in the microphone jack (on the side of the transceiver). Then insert the plug into the jack.

2.Slide the microphone onto the microphone holder.

3.To disconnect the microphone from the transceiver,

press the tab on the side of the plug. Then pull out the plug. .#

%100'%6+0)"#0"':6'40#." 52'#-'4

You can connect your transceiver to an external CB speaker, so you can hear an incoming call when you are outside your vehicle, or use the CB as a PA system.


The external speaker you use with the transceiver should have an impedance of 8 ohms and be able to handle 10 watts of power. The speaker cable must have a 1/8-inchplug.

To connect the external speaker to the transceiver, insert the speaker cable’s plug into EXT SPKR on the back of the CB.


The PA speaker should have an impedance of 8 ohms and be able to handle 10 watts of power. The speaker cable must have a 1/8-inchplug.

If your PA speaker meets the other specifications but does not already have a 1/8-inchplug, you can connect it using a phonoplug-to-wirecable, available at your local RadioShack store.

To connect the PA speaker to the transceiver, insert the speaker cable’s plug into PA SPKR on the back of the CB.


Insert the compass cable’s plug into SENSOR on the back of the CB. Do not place the compass cable near the DC cord or the antenna cable.


%100'%6+0)"#0"126+10#." /+%412*10'1'#42*10'

You can connect an optional microphone or earphone with a 3/32-inch(2.5mm) mini plug and a1/8-inch(3.5mm) plug to theMIC/EAR jacks on the front of the CB. To avoid feedback, do not connect the microphone/earphone’s3/32- inch (2.5 mm) plug to only theMIC jack in CB mode.

To connect a headset with Voice Activated operation, we recommend you check the response sensitivity of the VOX circuit before installation. Different Voice Activation devices provide different performance results.


Do not use an earphone with your transceiver when operating a motor vehicle in or near traffic. Doing so can create a traffic hazard and could be illegal in some areas.

If you use an earphone with your transceiver be very careful. Do not listen to a continuous broadcast. Even though some earphones/headphones let you hear some outside sounds when listening at normal volume levels, they still can present a traffic hazard.

75+0)"8'*+%.'"$#66'4;" 219'4

1.Connect the red wire (with the inline fuse holder) on the back of the transceiver to a point in your vehicle’s fuse block that has power only when the ignition is in the ACC (accessory) or ON position.



2.Connect the black wire to your vehicle battery’s

negative (–)terminal or to a metal part of the vehicle’s frame (chassis ground)..#


Do not connect the black wire to a non-metallic(plastic) part, or to any part insulated from the vehicle’s chassis by a nonmetallic part.

Most 13.8-voltDC power supplies plug into a standard AC outlet to produce DC power. Before connecting your CB to a13.8-voltDC power supply, read and follow the instructions included with the power supply.

To prevent damage to the CB, be sure you connect an antenna and the microphone before you use your CB.

Using Vehicle Battery Power


CB Your Using


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!


To comply with the FCC RF Exposure compliance requirements, a separation distance of at least 20.0 cm must be maintained between this device’s antenna and all persons.This device must transmit with a source-basedtimeaveraging duty factor not exceeding 50%.


Installation and Operation instructions are for satisfying FCC RF Exposure compliance.

To receive very weak signals, turn SQUELCH counterclockwise. You hear noise between transmissions, but you also hear weak transmissions (those not strong enough to break through a higher squelch setting).

If you experience interference from nearby frequencies, turn RF GAIN counterclockwise to reduce the receiver’s sensitivity.

75+0)"6*'"64#05%'+8'4"#5"#" $#5'"56#6+10

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:

13.8-voltDC power supply that can supply at least 2 amps.#

base station antenna.

coaxial antenna cable and connectors, available at your RadioShack store.

For the best performance, place the antenna as far as the cable length..#

Follow these steps to install the CB as a base station.

1.Mount the base station antenna as described in its owner’s manual. .#

2.Connect the antenna to ANTENNA on the back of the CB.

3.Connect the transceiver’s black power wire to the negative (–)terminal on the DC power supply.

4.Connect the transceiver’s red wire (with the in-linefuse) to the positive (+) terminal on the DC power supply.

5.Connect the DC power supply to a standard AC outlet.


Before you use your CB, you should know how to use it effectively and courteously. “Transmission Courtesy” on Page 9 contains information that will help you get more enjoyment from your CB.

4'%'+8+0)"64#05/+55+105"#0&"#&,756+0)" 537'.%*

1.Set PA/MON/CBto CB.

2.Turn SQUELCH fully counterclockwise.

3.Turn RF GAIN fully clockwise.


4.Turn on the transceiver by turning VOLUME clockwise

until it clicks. All LCD segments appear briefly. Then the channel and HN appear.

5.Rotate the channel selector, or repeatedly press (or hold down) UP orDOWN on the microphone until the desired channel appears.

6.Adjust VOLUME to a comfortable listening level.

7.To cut out background noise between transmissions, wait until there is no signal, then slowly turn SQUELCH clockwise until the background noise stops.

8.To turn off the CB, turn VOLUME toOFF until it clicks.


Follow Steps 1–7in “Receiving Transmissions and Adjusting Squelch.”

To transmit, hold down PUSH TO TALK on the microphone.JN appears. Hold the microphone2–3inches from your mouth and speak in a normal tone of voice, then releasePUSH TO TALK when you finish.JN disappears.

To turn off the CB, turn VOLUME toOFF until it clicks.


To select the emergency channel 9, press the channel selector once. Press again to select channel 19. / or'/ flashes. Press one more time to return to the previous selected channel.#"

You can also select Channel 9 or 19 by turning the channel selector or pressing UP orDOWN on the microphone.

To select another channel, rotate the channel selector or press UP orDOWN on the microphone.


Your CB has a built-inPA (public address) amplifier. With an optional PA speaker (see “Connecting a PA Speaker” on Page 4), you can turn your radio into a mobile public address system.

1.Turn on the transceiver. Set PA/MON/CB toPA.F7 appears.

Using Your CB


Channel 9 and Channel 19 are 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 or Channel 19.


We recommend you try receiving before you transmit.

To avoid acoustic feedback, the speaker should be at least 6 feet from the CB. If you experience feedback, avoid keying the microphone until you have moved the speaker away from the CB.


CB Your Using


Before calibration, end CB transmission and make sure the CB is not tuned to the Emergency channel 9 or 19 or in PA mode.

Do not calibrate the compass near metal or a strong magnetic field.

The compass is not available in TX mode.

2.To transmit, hold down PUSH TO TALK on the microphone. Hold the microphone2–3inches from your mouth and speak in a normal tone of voice.

3.Turn VOLUME for the desired volume level. If you hearhigh-pitchedsqueal, turnVOLUME counterclockwise until the squeal stops.

4.To turn off the PA amplifier, turn the transceiver off. Or, set PA/MON/CB toCB for CB communication.


You can use your CB as a receiver to listen to transmissions on an optional PA speaker. With a PA speaker connected, set PA/MON/CB toMON. Your CB cannot transmit and you hear sound only from the external PA speaker.


You can easily view your current heading at a glance. There are eight cardinal points on the display — north, northeast, east, southeast, south, southwest, west, northwest. Calibration helps the compass better separate the earth’s magnetic field from the magnetic field generated by external influences (such as your vehicle), providing more accurate heading information.

Calibrate the compass anytime you move it, or whenever distortion continuously appears. Before calibration, peel off the backing on one side of the supplied tape and attach the tape to the back of the compass, then mount the compass by peeling off the backing on the other side of the tape, then press the compass onto the level mounting surface, with the compass’ arrow facing up and pointing to the front. Do not mount the compass upside down.

1.Hold down CAL for a second. All eight cardinal points flash.

2.Drive your vehicle in two complete circles. Be sure your vehicle is on level ground, in an open area, such as a parking lot.

3.Press CAL to confirm calibration

You must complete the circles on level ground and press CAL within 10 minutes. Or, start from Step 1 again.

If an error is found during calibration, ;h appears for a few seconds. Move the compass to another place and start from Step 1 again.


After calibration, the current compass heading displays. For example, if the compass heading is south, the south cardinal point appears. Or, if the compass heading is northeast-north,the northeast cardinal point appears and the north cardinal point flashes.


You can store three channels in the memory. The preset channel stored in MEM1,MEM2, andMEM3 is Channel 1. Press the memory location number to switch to the stored channel. The channel number,C;C and the memory location number appear.

1.Select the desired channel.

2.Briefly hold down the desired memory location button. C;C and the memory location number flash twice.


In CB or monitor mode, press RCL to return to the last channel used for more than 3 seconds. PressRCL again to return to the previous channel.


You can adjust the backlight by rotating DIMMER. To turn off the backlight, rotateDIMMER fully counterclockwise.


Follow these guidelines for 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 PUSH TO TALK when you are not talking. (This is called dead keying.)

Assist callers with directions, information about road conditions, and any other reasonable requests.


When you rotate the channel selector or press UP orDOWN on the microphone to turn to the

channel stored in the memory, C;C and the memory location number appear.

The channel will only be saved to RCL memory when the current channel is manually turned using the rotary switch or UP orDOWN on the microphone and stays on the channel for more than 3 seconds.

You cannot recall an emergency channel or a memory channel by pressing RCL.

Using Your CB


CB Your Using


Although the 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?).


CB users have adopted the 10-codesfor standard questions and answers. This table lists common codes adopted by the Associated Public Safety Communications Officers (APCO).






Your signal is bad.




Your signal is good.


Stop transmitting.




Message received and understood.


Relay information to ________.




I am busy or are you busy?


Out of service.




In service.


Repeat last message.




Negative (NO).


________ in service.




Stand by.


Report road/weather conditions.






Message delivered.




Reply to message.


En route.






Contact _________.


What is your location?




Call ________ by telephone.


Cancel last message.




Arrived at the scene.


Assignment complete.




Meet __________


Estimated time of arrival is _____________.




Use caution.


Pick up.


Emergency traffic. Clear the channel.




What time is it?


Switch to Channel __________.




Cannot understand.