trc-498 - cb tricks

Cat. No. 21-1598

OWNER’S MANUAL

Please read before using this equipment.

TRC-498

40-Channel CB Mobile Transceiverwith Digital Signal Processor

21-1598.fm Thursday, August 5, 1999 10:52 AM

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FEATURES

© 1996 Tandy Corporation.All Rights Reserved.

RadioShack is a trademark used by Tandy Corporation.Powerhorn is a registered trademark used by Tandy Corporation.

Your RadioShack TRC-498 40-Channel CB Mobile Transceiver is abreakthrough in CB design technolo-gy. It includes a DSP (Digital SignalProcessor) circuit for improved audioquality, which reduces backgroundnoise and virtually eliminates thewhines and whistles commonly heardon crowded CB frequencies.

Your CB also has these advanced fea-tures:

DSP Switch and Indicator — turnsthe DSP circuit on and off and showsthe on/off status of the circuit.

Phase-Locked Loop (PLL) Frequen-cy Synthesizer — provides highly ac-curate and stable tuning.

Two Built-In Ceramic Filters — en-sure superior channel selectivity andfreedom from adjacent channel inter-ference.

Automatic Modulation Control —prevents the transmitter signal fromover-modulating and distorting.

Automatic Noise Limiter — reducesimpulse-type noises while receiving.

Large, Illuminated, Di gital Displa y— clearly shows the channel number.

Emergency Channel Switch — letsyou quickly switch to Channel 9 so youcan monitor or report emergency situ-ations.

Built-In PA (Public Address) Ampli-fier — lets you use your CB as a publicaddress system when you add an op-tional PA speaker.

Base Station Capabilit y — lets youuse the transceiver as a base stationpowered from a standard AC outlet(with an optional power supply andbase station antenna).

RF Gain Control — lets you adjust thereceiver gain to match the strength ofthe received signal.

4-Step RX Si gnal/TX Power Meter —shows the strength of the incomingand outgoing transmissions.

External Speaker Jack — lets youconnect your CB to an external speak-er.

Noise Reduction Switch — lets youselect one of two available noise re-duction modes.

Universal Mountin g Bracket — letsyou mount your CB securely in yourvehicle or on a table or shelf in yourhome.


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Note: To use this CB, you must con-nect a mobile or base station antenna.Your local RadioShack store has awide variety of antennas. For more in-formation, see “Connecting an Anten-na” on Page 6.

We recommend you record your CB’sserial number here. The number is onthe CB’s back panel.

Serial Number _________________

FCC INFORMATION

The Federal Communications Com-mission (FCC) does not require you tohave a license to operate this CB ra-dio. However, you must know Part 95of FCC Rules. It explains the properoperation of a Class D citizen’s bandtransceiver. We enclosed a copy ofPart 95 with your CB radio.

Warning: Do not open the CB radio tomake any internal adjustments. A CBradio is set up to transmit a regulatedsignal on an assigned frequency. It isagainst the law to alter or adjust thesettings inside the unit to exceed theselimitations.

Any adjustments to a CB radio must bemade by a qualified technician usingthe proper test equipment.

To be safe and sure:

• Never open your CB radio’s case.

• Never change or replace anythingin your CB radio.

Your CB radio might cause TV or ra-dio interference even when it is oper-ating properly. To determine whetheryour CB radio is causing the interfer-ence, turn off your CB radio. If the in-terference goes away, your CB radiois causing it. Try to eliminate the inter-ference by:

• Moving your CB radio away fromthe receiver

• Contacting your local RadioShackstore for help

If you cannot eliminate the interfer-ence, the FCC requires that you stopusing your CB radio.

This device complies with Part 15 ofFCC Rules. Operation is subject to thefollowing two conditions: (1) this de-vice may not cause harmful interfer-ence, and (2) this device must acceptany interference received, includinginterference that may cause undesiredoperation.


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CONTENTS

Installation ............................................................................................................ 5Attaching the Microphone Holder .................................................................... 5Mounting the Transceiver ................................................................................ 5Connecting an Antenna ................................................................................... 6Connecting the Microphone ............................................................................. 7Connecting Optional Speakers ........................................................................ 8

Using an External CB Speaker ................................................................. 8Connecting a PA Speaker ......................................................................... 8

Using Vehicle Battery Power ........................................................................... 9Using the Transceiver as a Base Station ......................................................... 9

Operation ............................................................................................................ 11Receiving Transmissions and Adjusting Squelch .......................................... 11Transmitting ................................................................................................... 12Using the Digital Signal Processor ................................................................ 13Selecting the Emergency Channel ................................................................ 13Using the PA Amplifier ................................................................................... 14

Operational Hints ............................................................................................... 15Common Uses for a CB ................................................................................. 15

Personal Uses ......................................................................................... 15Business Uses ........................................................................................ 15

Maximum Range ........................................................................................... 16Transmission Courtesy .................................................................................. 16Using Common 10-Codes ............................................................................. 17

Troubleshootin g ................................................................................................. 18Reducing Noise ............................................................................................. 20

Care and Maintenance ....................................................................................... 21Replacing the Fuse ........................................................................................ 22

Specifications ..................................................................................................... 23


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INSTALLATION

ATTACHING THE MICROPHONE HOLDER

You can connect the microphone hold-er to either side of the transceiver or toanother location in your vehicle.

To attach the holder to either side ofthe transceiver, secure the holder tothe side using the supplied screws andlock washers.

To attach the holder to another loca-tion in the vehicle, such as the dash-board, follow these steps.

1. Using the holder as a template,mark the positions for the mount-ing screw holes at the desiredlocation.

2. At each marked position, drill ahole slightly smaller than the sup-plied mounting screws.

Caution: Be careful not to drillinto anything behind the mount-ing surface.

3. Attach the holder at the mountinglocation using the supplied 3 mmmachine screws, spring washers,plain washers, and nuts.

Note: If you cannot reach behindthe mounting surface to attach thenuts on the machine screws, usethe supplied 3 mm plain washersand self-tapping screws.

MOUNTING THE TRANSCEIVER

The most common mounting locationfor this CB is under a vehicle’s dash-board. However, if you use the TRC-498 as a base station, you can place iton a desk, shelf, or table (see “Usingthe Transceiver as a Base Station” onPage 9).

If you are mounting the CB in a vehi-cle, choose a location where:

• You can easily reach the CB.

• Wires and cables are clear of thevehicle’s pedals or other movingparts.

• The CB is not directly in front ofheating vents.

• All wires and cables can reachtheir connection points.


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Caution: If you use the CB in a vehi-cle, mount it securely to avoid damageto the CB or vehicle or injury to anyonein the vehicle during sudden starts orstops.

Follow these steps to mount the CBusing the supplied hardware.

1. Using the mounting bracket as atemplate, mark the positions forthe screw holes on the mountingsurface.

2. In each marked location, drill ahole slightly smaller than the sup-plied mounting screws.

Caution: Be careful not to drillinto objects behind the mountingsurface.

3. Mount the bracket to the mountingsurface with the supplied 6 mmbolts, spring washers, plain wash-ers, and nuts.

Note: If you cannot reach behindthe mounting surface to attach the

nuts on the bolts, use the supplied6 mm self-tapping screws andplain washers to secure thebracket.

4. Attach the CB to the mountingbracket using the supplied rubberwashers and mounting knobs.

CONNECTING AN ANTENNA

There are many different types of CBantennas for mobile CBs. Each typehas its own benefits, so choose theone that best meets your needs. Yourlocal RadioShack store sells a wide va-riety of antennas.

Note: If you are using this CB as abase station, see “Using the Trans-ceiver as a Base Station” on Page 9.

When you choose an antenna, keep inmind that, for the best performance,you should mount the antenna:

• As high as possible on the vehicle

• As far as possible from sources ofelectrical noise

• Vertically


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Once you choose an antenna, followits mounting instructions. Then routethe cable to the transceiver and con-nect the cable to the ANT jack on theback of the transceiver.

Cautions:

• Avoid routing the cable next tosharp edges or moving parts,which might damage the cable.

• Do not run the cable next to powercables or other radio antenna ca-bles.

• Do not run the cable through theengine compartment or otherareas that produce extreme heat.

To achieve your radio’s maximumrange, adjust the antenna’s StandingWave Ratio (SWR) using an SWRmeter (not supplied).

Follow the instructions supplied withthe SWR meter and antenna to adjustyour antenna’s SWR to the lowest pos-sible value. SWR values of 2.0:1 aregenerally acceptable, with readings of1.5:1 or lower being more desirable.

CONNECTING THE MICROPHONE

1. Press the tab on the side of thesupplied microphone’s plug andinsert the plug into the micro-phone jack on the side of thetransceiver. Be sure the tab isaligned with the jack’s notch.

2. Slide the microphone onto themicrophone holder.

Caution: To disconnect the micro-phone from the transceiver, press thetab on the side of the plug. Then pullout the plug. Never pull on the micro-phone cable.

To Antenna


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CONNECTING OPTIONAL SPEAKERS

You can connect your transceiver to anexternal CB speaker and/or a PA (pub-lic address) speaker.

Note: When you connect an externalor PA speaker, the CB’s internalspeaker disconnects.

Using an External CB Speaker

The external speaker you use with thetransceiver should have an impedanceof 8 ohms and be able to handle 3 to 10watts of power, such as RadioShackCat. No. 21-549. The speaker cablemust have a 1/8-inch plug.

To connect the external speaker to thetransceiver, insert the speaker cable’splug into the EXT SPKR jack on theback of the CB.

To an 8-ohm,3- to 10-WattSpeaker

PowerConnections

Connecting a PA Speaker

The PA speaker should have an im-pedance of 8 ohms and be able to han-dle at least 5 watts of power, such asany of the RadioShack Powerhorn® se-ries speakers. The speaker cable musthave a 1/8-inch plug.

If your PA speaker does not alreadyhave a 1/8-inch plug, we recommendconnecting the PA speaker with aphono plug-to-wire cable, available atyour local RadioShack store.

To connect the PA speaker to thetransceiver, insert the speaker cable’splug into the PA SPKR jack on the backof the CB.

Note: The speaker should be at least 6feet from the CB.

To an 8-ohm,5-Watt or GreaterSpeaker

PowerConnections


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USING VEHICLE BATTERY POWER

Follow these steps to connect thetransceiver to vehicle battery power.

1. Connect the red wire (with the in-line fuse holder) on the back ofthe transceiver to a point in yourvehicle’s fuse block that haspower only when the ignition is inthe ACC (accessory) or ON posi-tion.

2. Connect the black wire to a metalpart of the vehicle’s frame (chas-sis ground).

Caution: Do not connect theblack wire to a non-metallic (plas-tic) part, or to any part insulatedfrom the vehicle’s chassis by anon-metallic part.

USING THE TRANSCEIVER AS A BASE STATION

Although this transceiver is designedmainly for mobile use, you can alsouse it as a base station with an ACpower source.

For base station installation, you needthese items:

• 12-volt DC power supply that cansupply at least 1.5 amps (such asCat. No. 22-120)

Caution: Most 12-volt DC powersupplies plug into a standard ACoutlet to produce DC power.Before connecting your CB to a12-volt DC power supply, readand follow the instructionsincluded with the power supply.

• Base station antenna (such asCat. No. 21-967)

• Coaxial antenna cable and con-nectors

Note: Your local RadioShackstore carries coaxial antennacable and connectors.

Black Wireto Ground

Red Wire to SwitchedAccessoryTerminal


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Follow these steps to install the CB asa base station.

1. Mount the base station antennaas described in its owner’s man-ual.

Warning: Use extreme cautionwhen you install or remove a basestation CB antenna. If the antennastarts to fall, let it go. It could con-tact overhead power lines. If theantenna touches a power line,contact with the antenna, mast,cable, or guy wires can causeelectrocution and death. Call thepower company to remove theantenna. Do not attempt to do soyourself.

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

Black Wireto Negative Terminal ofDC PowerSupply

Red Wire to Positive Terminal of

SupplyDC Power

Antenna

3. Connect the transceiver’s blackpower wire to the negative (–) ter-minal on the DC power supply.

4. Connect the transceiver’s red wire(with the in-line fuse) to the posi-tive (+) terminal on the DC powersupply.

5. Connect the DC power supply to astandard AC outlet.


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OPERATIONCaution: To prevent damage to theCB, be sure you connect an antennaand the microphone before you usethe CB.

Before you use your CB, you shouldknow how to use it effectively andcourteously. “Operational Hints” con-tains information that will help you getmore enjoyment from your CB.

RECEIVING TRANSMISSIONS AND ADJUSTING SQUELCH

1. Set CB/PA to CB.

2. Turn SQUELCH fully counterclock-wise.

3. Turn RF GAIN fully clockwise.

4. Turn on the transceiver by turningVOLUME clockwise until it clicks.The channel display lights and thechannel appears.

5. Set OUT/CH9 to OUT to select achannel other than Channel 9 (theemergency channel).

6. Rotate the channel selector untilthe display shows the desiredchannel.

7. Adjust VOLUME to a comfortablelistening level.

8. To cut out background noise be-tween transmissions, wait untilthere is no signal, then slowly turnSQUELCH clockwise until thebackground noise stops.


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Note: To receive very weak sig-nals, turn SQUELCH counterclock-wise. You hear noise betweentransmissions, but you also hearweak transmissions (those notstrong enough to break through ahigher squelch setting).

9. When the transceiver receives asignal, the RX SIGNAL indicatorslight. If the received signal is dis-torted, decrease the overall signallevel by rotating RF GAIN counter-clockwise.

10. Set the noise reduction switch tothe proper setting to eliminate thetype of noise you are hearing.

NR — to reduce background noise

TR — to eliminate tones, hetero-dynes, whistles, and whines

11. To turn off the CB, turn VOLUMEcounterclockwise until you hear itclick. The display and indicatorsturn off.

TRANSMITTING

Note: We recommend you try receiv-ing before you transmit.

1. Follow Steps 1–7 in “ReceivingTransmissions and AdjustingSquelch.”

2. To transmit, press the talk buttonon the microphone. Hold the mi-crophone 2–3 inches from yourmouth and speak in a normal toneof voice, then release the talk but-ton. The TX POWER meter lights.

Notes:

• Usually, all four LEDs light. Iffewer than four light, you mighthave a weak power source orimproper power or antennaconnections.


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• The MOD (modulation) lightflickers as you speak. If the indi-cator lights continuously, youare speaking too loudly. If itlights dimly, you might bespeaking too softly.

3. To turn off the CB, turn VOLUMEcounterclockwise until you hear itclick. The display and indicatorsturn off.

USING THE DIGITAL SIGNAL PROCESSOR

The DSP circuit eliminates steadytones or squeals and reduces noise inthe voice band. To activate the DSPcircuit, press DSP. The DSP indicatorlights.

Note: The DSP circuit works only whilereceiving transmissions.

To deactivate the DSP circuit, pressDSP again. The DSP indicator turnsoff.

SELECTING THE EMERGENCY CHANNEL

Important: Channel 9 is reserved formotorist assistance and for reportingemergency information about acci-dents, hazardous road conditions, andso on. Always give emergency mes-sages priority on Channel 9.

To select the emergency channel(Channel 9), set OUT/CH9 to CH9. 9flashes on the display, and the trans-ceiver stays on Channel 9.

Note: You can also select Channel 9using the rotary selector when OUT/CH9 is set to OUT. 9 still appears onthe display, but it does not flash.

To select another channel, set OUT/CH9 to OUT. The previously selectedchannel number appears on the dis-play.

MOD


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USING THE PA AMPLIFIER

Your CB has a built-in PA (public ad-dress) amplifier. With an optional PAspeaker, you can turn your radio into amobile public address system.

Follow these steps to use the PA am-plifier after you connect an externalPA speaker (see “Connecting a PASpeaker” on Page 8).

1. Turn on the transceiver. Then setCB/PA to PA. PA appears on thedisplay.

2. To transmit, press the talk buttonon the microphone. Hold the mi-crophone 2–3 inches from yourmouth and speak in a normal toneof voice.

3. Turn VOLUME for the desired vol-ume level. If you hear a high-pitched squeal, adjust VOLUMEuntil the squeal stops.

Note: The speaker should be atleast 6 feet from the CB.

4. To end PA operation, turn thetransceiver off. Or, set CB/PA toCB for CB communication.

CB PA


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OPERATIONAL HINTS

Like most activities, CB radio has itscustoms and courtesies. The followingtips will help you get the most enjoy-ment from your CB.

COMMON USES FOR A CB

Personal Uses

• Keep in touch with home whiledriving to work, to the store, or toa social activity. Let your familyknow you are tied up in traffic orthat you will stop by the store onthe way home.

• If you are a two-car (or more) fam-ily, CB radios are great for com-municating with family memberswhile they are in their cars.

• Contact friends or neighbors —find out “what’s happening” orplan a get-together.

• Ever have car trouble or run out ofgas on the highway? What an as-surance it is to be able to radio forassistance!

• Camping, fishing, and other sportsare more fun with a CB radio.Locate a buddy or find out “what’scooking” back at camp.

Business Uses

• For security officers, a CB is morethan a convenience — it is a mustfor both safety and efficiency.

• Truck drivers and delivery person-nel can learn road and traffic con-ditions and get assistance inlocating destinations. A CB radiois also good company on those“long hauls.”

• On construction crews, a CB radioquickly pays for itself when youare calling for additional materialsor coordinating the activities of dif-ferent work crews.


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MAXIMUM RANGE

The maximum range and quality of CBradio transmissions vary dependingon the following conditions:

• The type and quality of antennaused

• The height of the antenna’smounting location — the higherthe antenna, the better the sig-nal’s range

• The surrounding terrain — moun-tains and tall buildings limit therange

• Weather conditions

• The number of nearby radiosoperating on the same channel

• Standing wave ratio (SWR) be-tween the antenna and the CB.

Note: Your CB radio’s transmissionrange is generally line-of-sight.

TRANSMISSION COURTESY

Please follow these guidelines of radiocourtesy when using your CB.

• Wait for a pause in someoneelse’s transmission before youask for a break.

• If you do not receive an answer toyour call after a second attempt,sign off and wait several minutesbefore trying again.

• Do not hold down the Talk buttonwhen you are not talking. (This iscalled dead keying.)

• Assist callers with directions,information about road conditions,and any other reasonable re-quests.


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USING COMMON 10-CODES

Citizen’s band operators and CB radio users have largely adopted the 10-codes forstandard questions and answers. These codes permit faster communication andbetter intelligibility in noisy areas.

This table lists codes adopted by the Associated Public-Safety Communications Of-ficers (APCO).

Code Meaning

10-1 Your signal is bad.

10-2 Your signal is good.

10-3 Stop transmitting.

10-4Message received and under-stood.

10-5 Relay information to _____.

10-6 I am busy or are you busy?

10-7 Out of service.

10-8 In service.

10-9 Repeat last message.

10-10 Negative (NO).

10-11 _____ in service.

10-12 Stand by.

10-13Report road/weather condi-tions.

10-14 Information.

10-15 Message delivered.

10-16 Reply to message.

Code Meaning

10-17 En route.

10-18 Urgent.

10-19 Contact _____.

10-20 What is your location?

10-21 Call _____ by telephone.

10-22 Cancel last message.

10-23 Arrived at the scene.

10-24 Assignment complete.

10-25 Meet _____.

10-26Estimated time of arrival is _____.

10-30 Use caution.

10-31 Pick up.

10-33Emergency traffic. Clear the channel.

10-34 What time is it?

10-41 Switch to Channel xx.

10-62 Cannot understand.


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TROUBLESHOOTING

If at any time you suspect that your CB is not working as it should, refer to the fol-lowing chart to see if you can eliminate the problem. If these solutions do not solvethe problem, do not attempt repairs or adjustment yourself. The CB should be ser-viced only by a qualified radio technician. If you still have problems, take your CB toa local RadioShack store for assistance.

Symptom Solution

CB has trouble receiving.

Turn transceiver power on.

Microphone connected? Secure connections.

Antenna connected? Secure connections.

Too much squelch? Adjust as needed.

Radio not on operating channel? Switch to active channel.

Set CB/PA to CB.

Adjust VOLUME.

Adjust RF GAIN.

CB has trouble transmit-ting.

Turn transceiver power on.

Antenna connected? Secure connections.

All connections free of corrosion? Clean and tighten.

Microphone connector loose? Firmly press in jack.

Set CB/PA to CB.

Radio not on operating channel? Switch to an active channel.

Talk button fully pressed in? Press completely.


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Radio does not work at all.

Power connected? Secure connections.

Microphone connected? Secure connections.

Fuse needs replacing? Replace with identical fuse. See “Replacing the Fuse” on Page 22.

Cannot select a channel.

Set CB/PA to CB.

Set OUT/CH9 to OUT.

Talk button fully pressed in? Press completely.

PA does not work.

Connect a PA speaker. Secure connections.

Set CB/PA to PA.

Adjust VOLUME.

Sound is distorted.

Adjust RF GAIN.

Set the noise reduction switch to NR or TR.

Adjust VOLUME.

Symptom Solution


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REDUCING NOISE

Because your CB is exceptionally qui-et, any noise you hear is probably froman external source in your vehicle suchas the alternator, another radio orspark plugs.

The transceiver uses an ANL (Auto-matic Noise Limiter) circuit and a DSP(Digital Sound Processor) circuit to re-duce noise. However, if possible, try toeliminate the noise by finding itssource.

You can determine the noise’s sourceby turning off the engine and operatingthe CB with your vehicle’s ignition setto ACC. If the noise is reduced, theproblem is in your vehicle’s ignition orelectrical system.

Here are a few hints to help you re-duce or eliminate such noise:

• Make all CB power and antennawires as short as possible.

• Route the power wires away fromthe antenna wires.

• Be sure that the chassis groundconnection is secure.

• Replace old ignition wires withnew, high-voltage, noise suppres-sion wires.

• Install noise suppressors on yourspark plugs, or install new sparkplugs that have built-in noise sup-pressors.

• If problems persist, check youralternator/generator and regula-tor gauges. You can reduce thenoise from these sources by usingbypass capacitors at the variousoutput voltage points.

Your local RadioShack store has awide selection of noise suppressionaccessories.


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CARE AND MAINTENANCE

Your RadioShack TRC-498 40-Channel CB Mobile Transceiver is an example of su-perior design and craftsmanship. The following suggestions will help you care foryour CB so you can enjoy it for years.

Keep the CB dry. If it gets wet, wipe it dry immediately. Liquids cancontain minerals that can corrode electronic circuits.

Handle the CB gently and carefully. Dropping it can damage circuitboards and cases and can cause the CB to work improperly.

Use and store the CB in normal temperature environments. Temper-ature extremes can shorten the life of electronic devices, damagebatteries, and distort or melt plastic parts.

Keep the CB away from dust and dirt, which can cause prematurewear of parts.

Wipe the CB with a damp cloth occasionally to keep it looking new.Do not use harsh chemicals, cleaning solvents, or strong detergentsto clean the CB.

Modifying or tampering with the CB’s internal components can cause a malfunctionand might invalidate its warranty and void your FCC authorization to operate it. Ifyour CB is not performing as it should, take it to your local RadioShack store for as-sistance.

CLEANER


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REPLACING THE FUSE

The TRC-498’s 2-amp in-line fusehelps protect your CB from powersurges and short circuits. When re-placement is required, use a 2-amp,slow-blow glass fuse, such as Cat. No.270-1023.

Follow these steps to replace the fuse.

1. Make sure the power source andCB are both off.

2. Hold the fuse holder by both ends,push the ends together, twist oneend counterclockwise, then pullthem apart.

3. Remove the old fuse and inspectits condition. If it is blown and re-quires replacement, insert a newone of the same type and rating. Ifit is not blown, reinsert it.

4. Push the fuse holder endstogether and twist one end clock-wise.


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SPECIFICATIONS

RECEIVER

Frequency Coverage ................All 40 CB Channels (Class D) 26.965–27.405 MHzSensitivity for 10dB S/N ................................................................................ 0.5 mVSquelch Sensitivity at Tight ........................................................................1000 mVOverall Audio Fidelity for 450–2500 Hz .......................................................... –6 dBMaximum Audio Output Power .................................................................... 6 WattsCross Modulation ............................................................................................ 50 dBRF Gain Control Range (at 10 dB Input) ........................................................ 45 dB

TRANSMITTER

Frequency Coverage ................All 40 CB Channels (Class D) 26.965–27.405 MHzFrequency Tolerance .................................................................................. ±100 HzCarrier Power at No Modulation ............................................................... 3.9 WattsSpurious Emission ........................................................................................ –70 dBCurrent Drain at No Modulation ................................................................. 1100 mAModulation Frequency Response for 450–2500 Hz ....................................... –6 dBMicrophone Sensitivity for 50% Modulation ..................................................... 1 mV

PUBLIC ADDRESS AMPLIFIER

Maximum Output Power .............................................................................. 6 WattsMicrophone Sensitivity for 4 Watts Output Power ........................................... 3 mVFrequency Response for 450–2500 Hz .......................................................... –6 dBCurrent Drain at Maximum Output Power ..................................................1000 mA

DSP NOISE REDUCTION

Background Noise Reduction ..................................................................... 6–12 dBTone Attenuation for 450–2500 Hz ................................................................. 25 dB

GENERAL

Power Requirements ................... 12 Volts DC, Negative Ground/120 V DC, 60 HzDimensions (HWD) ........................... 15/8 ¥ 59/16 ¥ 83/8 inches (42 ¥ 141 ¥ 213 mm)Weight ............................................................................................. 2 lb 3 oz (1 kg)Included Accessories .................................. Microphone Hanger, Mounting Bracket

Specifications are typical, individual units might vary. Specifications are subjectto change and improvement without notice.


RadioShackA Division of Tandy Corporation

Fort Worth, Texas 76102

811080500A7A6 Printed in China

RadioShack Limited Warranty

This product is warranted against defects for 90 days from date of purchase fromRadioShack company-owned stores and authorized RadioShack franchisees and deal-ers. Within this period, we will repair it without charge for parts and labor. Simply bringyour RadioShack sales slip as proof of purchase date to any RadioShack store. War-ranty does not cover transportation costs. Nor does it cover a product subjected to mis-use or accidental damage. EXCEPT AS PROVIDED HEREIN, RadioShack MAKES NO EXPRESS WARRANTIESAND ANY IMPLIED WARRANTIES ARE LIMITED IN DURATION TO THE DURATIONOF THE WRITTEN LIMITED WARRANTIES CONTAINED HEREIN. Some states donot permit limitation or exclusion of implied warranties; therefore, the aforesaid limita-tion(s) or exclusion(s) may not apply to the purchaser. This warranty gives you specific legal rights and you may also have other rights which vary fromstate to state.

We Service What We Sell 10/95


trc-498 - cb tricks

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