Cobra 25 LTD Classic
Contents
1. BRT DIM SWITCH Controls brightness of the LED channel indicator and the multi function meter for optimum intensity for day or nighttime driving CH 19 CH 9 NORMAL SWITCH Used for instant selection of emer gency Channel 9 CH 9 position or information Channel 19 In NORMAL position all 40 CB channels can be accessed by the CHANNEL SELECTOR switch RX TX LED INDICATOR When your radio is in the CB receive mode the LED will be green When in transmit mode the LED will be red Operation Cont 13 SOUNDTRACKER INDICATOR A red LED will illuminate when the Sound Tracker system is engaged on your CB 14 SOUNDTRACKER SWITCH Depressing this button turns on the Sound Tracker system in your CB 15 LED CHANNEL DISPLAY The selected channel will be displayed B Press To Talk Microphone Both the receiver and transmitter are controlled by the Press to Talk switch on the microphone Press the switch and the transmitter is activated release the switch to receive When transmitting hold the microphone two inches from the mouth and speak clearly in a normal voice The microphone provided with your radio is a detachable low impedance dynamic type tindi nm ammuua 1OT L CRT TE Cora row NUT C Rear Panel 1 PUBLIC ADDRESS An external 8 ohm 4 0 watt PA speaker may be con nected to the PA Speaker Jack wh2. Customer Signature Circle One Discover Visa
3. which can assist you by answering the most frequently asked questions about Cobra products 773 889 3087 24 hours a day 7 days a week A Consumer Service Representative can be reached through this same number 8 00 am 8 00 pm Monday through Friday CST Technical assistance is also available on line in the Frequently Asked Question FAQ section at www cobraelec com or by e mail to productinfo cobraelec com 16 17 Warranty and Service Limited Two Year Warranty COBRA ELECTRONICS CORPORATION warrants that its COBRA citizens band CB radio and the component parts thereof will be free of defects in workman ship and materials for period of two 2 year from the date of first consumer pur chase This warranty may be enforced by the first consumer purchaser provided that the product is utilized within the U S A COBRA will without charge repair or replace at its option defective citizens band CB products or component parts upon delivery to the COBRA factory Service Department accompanied by proof of the date of first consumer purchase such as a duplicated copy of a sales receipt You must pay any initial shipping charges required to ship the product for war ranty service The return charges will be at Cobra s expense if the product is repaired or replaced under warranty For further details concerning procedures for obtaining service see the If You Need Service section of the Owner s Manual Exclusi
4. controls the gain to the extent that full talk power is available several inches away from the microphone In the Public Address PA mode the control functions as the volume control Operation Cont 5 10 11 12 RF GAIN Adjust as required to optimize signal This control is used primarily to optimize reception in strong signal areas Gain is reduced by counterclockwise rotation of the control CHANNEL SELECTOR SWITCH This switch selects any one of forty Citizens Band channels desired The selected channel is indicated by the LED readout directly above the channel selector knob S METER Swings proportionally to the strength of the incoming signal during receiving RF METER Swings proportionally to the RF output power while transmitting CB ANL PA SWITCH Selects the mode of operation In the CB ANL po sition the PA function is disabled and the unit will transmit and receive on the selected frequency The PA function should not be used unless a PA speaker is connected In the PA mode incoming CB transmissions will be heard through the PA speaker This allows you to monitor messages when you are not inside your vehicle NOTE ANL Automatic Noise Limiter is a non switchable feature that is always on to reduce background noise NB OFF SWITCH When this switch is in the NB position the RF noise blanker is activated The RF noise blanker is very effective for repetitive impulse noise such as ignition interference
5. the engine block or chassis Connect the black lead to the negative side of the automobile This is usually the chassis of the car Any convenient location with good electrical contact remove paint may be used Plug power cable into jack on back of transceiver In positive ground automobiles the red wire goes to the chassis and the black wire is connected to the ignition switch Mount microphone bracket on right side of the transceiver or near it using two screws supplied When mounting in an automobile place the bracket under the dash so the microphone is readily accessible Installation Cont CB Antenna Since the maximum allowable power output of the transmitter is limited by the FCC the antenna is one important factor affecting transmission distance Only a properly matched antenna system will allow maximum power transfer from the 50 ohm transmission line to the radiating element In mobile installations cars trucks boats etc an antenna system that is non directional should be used A vertically polarized quarter wavelength whip antenna provides the most reli able operation and greatest range Shorter loaded type whip antennas are more attractive compact and adequate for applications where the maximum possible distance is not required Also the loaded whips do not present the problems of height imposed by a full quarter wavelength whip Mobile whip antennas utilize the metal body of the vehicle as a ground plane
6. 31 27 315 12 27 105 32 27 325 13 27 115 33 27 335 14 27 125 34 27 345 15 27 135 35 27 355 16 27 155 36 27 365 17 27 165 37 27 375 18 27 175 38 27 385 19 27 185 39 27 395 20 27 205 40 27 405 The COBRA 25 LTD ST has a vastly superior receiver which includes noise blanker circuitry and an automatic noise limiter The receiver also features increased protection against cross modulation and strong adjacent channel signals To obtain maximum performance please read carefully the descriptions and operating instructions in this manual Fill out below keep for your records Serial No Date of Purchase Dealer Name Keep this manual for detailed information about your Cobra CB radio SAVE YOUR SALES RECEIPT CARTON AND PACKING FOR POSSIBLE FUTURE USE Specifications cont GENERAL Channels 40 Frequency Range 26 965 to 27 405 MHz Frequency Control Phase Lock Loop PLL synthesizer Frequency Tolerance 0 00576 Operating Temperature Range 30 C to 50 C Microphone Plug in dynamic Input Voltage 13 8VDC nom positive or negative ground Transmit AM full mod 1 5A maximum Receive Squelched 0 3A full audio output 1 2A Current Drain nominal Size 89 g D 7 W 2 13 64 Weight 4 lbs Antenna Connector 50 239 Semiconductors 26 transistors 26 diodes 4 integrated circuits Meter Illuminated indicates relative power output and received signal strength TRANSMITTER Power Outpu
7. Amplified power mic CA 75 19 95 POWER NOISE CANCELLING MICROPHONE Amplified power mic with noise cancelling design CA 77 39 95 POWER ECHO MICROPHONE Amplified power mic with echo circuitry CA 79 69 95 ATW 400 High performance magnetic mount antenna ATW 400 39 95 ATW 480 High performance replacement whip antenna Cable and bracket not included ATW 480 29 95 Prices subject to change without notice Illinois residents add 7 Cook Co residents add 75 7 75 total Chicago residents add 1 8 75 total Indiana residents add 596 Michigan residents add 4 96 Ohio residents add 696 Wisconsin residents add 596 If you wish you can order directly from Cobra Order by phone Amount Tax if applicable Shipping handling 3 75 Total Call 1 773 889 3087 Press 1 from the main menu 8a m 8p m M F CST Order by mail or fax Please fill out order form below and mail fax directly to Cobra Mail to Cobra Accessories Dept 6500 W Cortland St Chicago IL 60707 Fax to 1 773 622 2269 Make check or money order no stamps payable to Cobra Electronics and mail with this order form to Cobra Accessories Dept 6500 W Cortland St Chicago IL 60707 Call 773 889 3087 or fax 773 622 2269 for credit card orders Allow 4 to 6 weeks for delivery Offer valid in Continental U S only Please print clearly Name Address Not P O Box City Zip Credit Card No Exp Date
8. PA CB ANL switch into the PA position 3 Depress push to talk switch on mic speak in normal voice 4 Adjust PA speaker volume with front panel DYNAMIKE control When the Volume control is rotated clockwise activity on the CB channel will be heard through the PA speaker 12 How SoundTracker Works SOUNDTRACKER SYSTEM While previous systems only blanked out or limited noise in higher sound frequencies the revolutionary new SoundTracker System actually reduces noise while leaving the signal intact in the reception mode In the transmission mode it actually strengthens the signal providing you with a significant reduction in noise on reception and transmission Sound clarity is measured by the ratio of the signal level to the noise level The higher the signal to noise ratio the better the sound HOW SOUNDTRACKER WORKS On Reception Cuts Noise Coming In With a normal CB distant signals fall below the squelch level and are unintelli gible With a SoundTracker CB the noise level is cut by up to 90 which increases the signal to noise ratio and dramatically improves signal clarity This also allows you to significantly reduce the squelch level which greatly expands your listening range 100 Normal CB Signal SoundTracker CB Signal Signal Signal Squelch Level Signal Squelch Level Near Medium Distance between On Transmission Strengthens Signals Going Out A SoundTrac
9. PRINTED IN HONG KONG OPERATING INSTRUCTIONS FOR YOUR c UND FRACKER SYSTEM CITIZENS BAND 2 WAY MOBILE RADIO Model 25 LTD ST HC obra Cobra Hectronics Corporation 6500 W Cortland Street me Scc ra T N npe Chicago IL 60707 3 e o Ej 25 LTD ST a 3 9 y 1 COBRA ELECTRONICS CORP 1997 480 205 001 How To Use Your HC obra SS UND FRACKER QW SYSTEM Citizens Band 2 Way Mobile Radio Model 25 LTD ST Contents Page The CD SIOEV ME 1 DOUG Tracker System oues ba 1 BS CUE e 2 3 Installation E 4 tei pria mises 4 5 CBANENDA MC 6 Ignition Noise Interference 7 In House GA BA cU cien ga 7 Operation Controls and Indicators 1255 2 me a a rr kite 8 9 10 Operating Procedure to BecelVe u ues toe 11 Operating Procedure to Transmit cac ter elatis 12 How SoundTracker VWOPKS isole aie eb aa en nione 13 Maintenance and Adjustment eese 14 Appendix Ten Code a M 15 A Few Rules That Should Be Obeyed 16 How Your Can Serve YOU 16 Warranty Service I
10. When mounted at a corner of the vehicle they are slightly directional in the direc tion of the body of the vehicle For all practical purposes however the radiation pattern is nondirectional The slight directional characteristic will be observed only at extreme distances A standard antenna connector type SO 239 is provided on the transceiver for easy connection to a standard PL 259 cable termination Cobra loaded type antenna models are highly recommended for most installa tions Consult your Cobra dealer for further details or call 773 889 3087 and speak to a Cobra customer representative When installed in a boat the transceiver will not operate at maximum efficiency without a ground plate unless the vessel has a steel hull Before installing the trans ceiver in a boat consult your dealer for information regarding an adequate ground ing system and prevention of electrolysis between fittings in the hull and water 3 Way Combination Antennas are available which allow operation of all three bands AM FM amp CB using a single antenna However use of this type of antenna usually results in less than normal transmit and receive range when compared to a standard type Single Band antenna designed for CB only The quality of reception of radio signals is highly dependent on the antenna sys tem Call 773 889 3087 for further information Installation Cont Ignition Noise Interference Use of a mobile receiver at low signal leve
11. e is 10 3 Stop transmitting 10 37 Wrecker needed at 10 4 OK message received 10 38 Ambulance needed at 10 5 Relay message 10 39 Your message delivered 10 6 Busy stand by 10 41 Please turn to channel 10 7 Out of service leaving air 10 42 Traffic accident at 10 8 Inservice subject to call 10 43 Traffic Tie up at 10 9 Repeat message 10 44 Ihave a message for you 10 10 Transmission completed 10 45 units within range standing by please report 10 11 Talking too rapidly 10 50 Break channel 10 12 Visitors present 10 60 What is next message number 10 13 Advise Weather Road 10 62 Unable to copy use phone conditions 10 63 Net directed to 10 16 Make pick up at 10 64 Net clear 10 17 Urgent business 10 65 Awaiting your next 10 18 Anything for us message assignment 10 19 Nothing for you return 10 67 units copy to base 10 70 Fire at 10 20 My location is 10 71 Proceed with transmission 10 21 Call by telephone in sequence 10 22 Report in person to 10 77 Negative contact 10 23 Stand by 10 81 Reserve hotel room for 10 24 Completed last assignment 10 82 Reserve room for 10 25 Can you contact 10 84 My telephone number is 10 26 Disregard last information 10 85 My address is 10 27 Iam moving to channel 10 91 Talk closer to mike 10 28 Identify your station 10 93 Check my frequency on 10 29 Time is up for contact this channel 10 30 Does not conform to FCC rules 10 94 Please give me a long count 10 32 Iwill give you a radio check 10 99 Mission co
12. eads of the transceiver to the corresponding terminals of the power packs DO NOT ATTEMPT TO OPERATE THIS TRANSCEIVER BY CONNECTING DIRECTLY TO 120 VAC Temporary Mobile Operation To operate your COBRA transceiver from a car on a temporary basis you may want to purchase an optional cigar lighter adapter from your COBRA dealer This adapter and a magnetic mount antenna allow you to quickly install your trans ceiver for temporary use Controls and Indicators Refer to controls indicators and connectors as illustrated below e zz 19 9 0 9 4 VOL SQL GAIN nor A Front Panel 1 2 3 MICROPHONE CONNECTOR Front panel microphone connector OFF ON VOLUME Turn clockwise to turn power on and set the desired listening volume SQUELCH This control is used to cut off or eliminate receiver back ground noise in the absence of an incoming signal For maximum receiver sensitivity it is desired that the control be adjusted only to the point where the receiver background noise or ambient background noise is eliminated Adjust until the receiver noise disappears This will require the incoming signal to be slightly stronger than the average receiver noise Further clockwise rotation will increase the threshold level which a signal must overcome in order to be heard Only strong signals will be heard at a maximum clockwise setting DYNAMIKE Adjusts the microphone gain in the transmit and PA modes This
13. el Engage the Sound Tracker system by depressing the button labeled ST Listen to the background noise from the speaker Turn the SOUELCH CON TROL slowly clockwise until the noise JUST disappears no signal should be present Leave the control at this setting The squelch is now properly adjust ed The receiver will remain quiet until a signal is actually received Do not advance the control too far or some of the weaker signals will not be heard The revolutionary SoundTracker system allows you to reduce unwanted background noise static and increase the signal for better reception 11 Operation Cont Operating Procedure to Transmit 1 sure the operator has read and understands part 95 F C C Rules and Regulations prior to operating the transmitter 2 Select the desired channel 3 Setthe DYNAMIKE control fully clockwise 4 The receiver and transmitter are controlled by the press to talk switch on the microphone Press the switch and the transmitter is activated release switch to receive When transmitting on a clear channel hold the microphone two inches from the mouth and speak clearly in a normal voice Be sure the antenna is properly connected to the radio before transmitting Prolonged transmitting without an antenna or a poorly matched antenna could cause damage to the transmitter Operating Procedure for Public Address Connect PA speaker to the PA jack provided on the rear panel 1 2 Place
14. en this unit is used as a public address system The speaker should be directed away from the microphone to prevent acoustic feed back Physical separation or isolation of the micro phone and speaker must be employed when operating the PA at high output levels 2 EXTERNAL SPEAKER The External Speaker Jack is used for remote receiver monitoring The external speaker should have 8 ohm impedance and be rated to handle at least 4 0 watts When the external speaker is plugged in the internal speaker is automatically disconnected 10 Operation Cont oN Oo amp WN 4 ANTENNA CONNECTOR This 50 239 connector permits connection of the transmission line cable PL 259 connector to the transceiver POWER This jack permits connection of the DC power to the transceiver A power cord with polarized plug is supplied with the radio The polar ized plug ensures that the power will always be connected properly Operating Procedure to Receive Be sure that the power cord antenna and microphone are connected to the proper connectors before proceeding further The PA CB should be in the CB position Turn the radio ON by rotating the VOLUME CONTROL clockwise Set the RF GAIN CONTROL fully clockwise Set DELTA TUNE CONTROL to center click stop position Rotate SOUELCH CONTROL counterclockwise until incoming signal is heard Set the CHANNEL SELECTOR Switch to the desired channel Set VOLUME CONTROL to a comfortable listening lev
15. esult is a clearer cleaner sounding reception of signals and more powerful transmissions which dramatically improve CB Communications All transmitter adjustments other than those supplied by the manufacturer as front panel operating controls must be made by or under the supervision of the holder of an FCC issued general Radio Telephone Operator s License Replacement or substitution of transistors regular diodes or other parts of a unique nature with parts other than those recommended by Cobra may cause violation of the technical regulations of Part 95 of the FCC Rules or violation of Type Acceptance requirements of Part 2 of the Rules You should read and understand Part 95 included with this unit of the FCC Rules and Regulations before operating your Cobra radio even though the FCC no longer requires you to obtain an operators license Specifications FREQUENCY RANGE The COBRA 25 LTD ST transceiver represents one of the most advanced AM two way radios ever designed for use as a Class D station in the Citizens Radio Service This unit features advanced Phase Lock Loop PLL circuitry providing complete coverage of all 40 channels as shown below Channel Channel Frequency Channel Channel Frequency in MHz in MHz 1 26 965 21 27 215 2 26 975 22 27 225 3 26 985 23 27 255 4 27 005 24 27 235 5 27 015 25 27 245 6 27 025 26 27 265 7 27 035 27 27 275 8 27 055 28 27 285 9 27 065 29 27 295 10 27 075 30 27 305 11 27 085
16. ker CB strengthens the transmit signal by more effectively using the available RF power output of the CB The result is improved transmission signal clarity and an expanded transmission range 13 Maintenance Adjustment The COBRA CB transceiver is specifically designed for the environment encoun tered in mobile installations The use of all solid state circuitry and its light weight result in high reliability Should a failure occur however review the following then if necessary replace parts only with identical parts Do not substitute Refer to the schematic diagram and parts 1 Check connections to the source of power and make sure it is the 13 8 VDC required to operate your radio 2 Check the fuse in the DC power cord The main power lead red wire has a 2 Amp 3AG type fuse in its holder Use only the above specified type and size fuse for maximum protection Failure to do so will void the warranty 3 certain the microphone is properly plugged in 4 Make certain the antenna is properly connected and tuned for minimum SWR NOTE COBRA antennas include full instructions as to how to tune your antenna If you re still in doubt about the procedure contact the COBRA dealer from whom you purchased your radio and antenna for advice If you hired an installer to install your radio and antenna contact the installer If you are unable to correct the problem refer the WARRANTY SERVICE INSTRUCTIONS at the end of thi
17. ll merchandise or professional service 4 Pack unit securely to prevent damage in transit If possible use the original packing material 5 Ship prepaid and insured by way of a traceable carrier to avoid loss in How youn CB transit such as United Parcel Service UPS Roadway Parcel Service RPS Warn of traffic tie ups ahead or First Class Insured Mail to Cobra Factory Service Cobra Electronics Corporation 6500 W Cortland St Chicago IL 60707 Cobra is not respon Provide weather and road information sible for units not received if package has not been properly insured Provide help fast in event of emergency or breakdown 6 If the unit is in warranty upon receipt of your unit it will either be repaired or exchanged depending on the model Please allow approximately 3 to 4 weeks Suggest good spots to eat and sleep before contacting us for status If the unit is out of warranty a letter will auto matically be sent informing you of the repair charge or replacement charge If Make long trips more interesting and help keep you awake you have any questions please call 773 889 3087 for assistance Provide direct contact with your office or home Make friends for you as you travel Provide local information to find you destination Help law enforcement officers by reporting drunk and reckless drivers i i Help Desk P y rep 5 For technical assistance please call our Automated Help Des
18. ls is normally limited by the presence of electrical noise The primary source of noise in automobile installations is from the alternator and ignition system in the vehicle Under most operating conditions when signal level is adequate the background noise does not present a serious problem Also when extremely low level signals are being received the transceiver may be operated with vehicle engine turned off The unit requires very little current and therefore will not significantly discharge the vehicle battery Even though the COBRA 25 LTD ST has an automatic noise limiter in some instal lations ignition interference may be high enough to make good communications impossible The electrical noise may come from several sources Many possibili ties exist and variations between vehicles require different solutions to reduce the noise Consult your COBRA dealer or a 2 way radio technician for help in locat ing and correcting the source of severe noise Base Station Operation Operation from 120VAC House Current To operate your transceiver from your home or office using the regular house current as the power source you will require a 12 VDC power pack that has been specially designed for the purpose It is available as optional equipment from your COBRA dealer It consists of a 120 volt 60 Hz AC to 12 volt DC power con verter that delivers the required power for the operation of the transceiver Simply connect the red and black l
19. mpleted all 10 33 EMERGENCY TRAFFIC units secure 10 34 Trouble at this station 10 200 Police needed at Appendix Cont If You Think You Need Service A Few Rules That Should Be Obeyed If You Think You Need Service Call 773 889 3087 1 You are not allowed to carry on a conversation with another station for more If your product should require factory service please call Cobra than five minutes at a time without taking a one minute break to give others first before sending your unit in This will ensure the fastest a chance to use the channel turnaround time on your repair You may be asked to send your unit to the Cobra factory It will be necessary to 2 Y t allowed to blast others off the air b ing them with eet Le ieee a MSc ee OAM LUE furnish the following in order to have the product serviced and returned illegally amplified transmitter power or illegally high antennas 1 For Warranty Repair include some form of proof of purchase such as a 3 You can t use the CB to promote illegal activities mechanical reproduction or carbon or a sales receipt If you send the 4 original receipt it cannot be returned F OIQIUSTCHOEADONIROSED UAR TORIUEY 2 Send the entire product Must include CB unit and microphone 5 You may not play music in your CB 3 Enclose a description of what is happening with the unit Include a typed or clearly printed name and address of where the unit is to be returned 6 You may not use your CB to se
20. nstructions eee 17 Limited Two Year Warranty i t tae ritate ied rh ertt tnb Rea a prit 18 Ju oig M Inside Back Cover The CB Story The Citizens Band lies between the shortwave broadcast and 10 meter Amateur radio bands and was established by law in 1949 The Class D two way commu nications service was opened in 1959 CB also includes a Class A citizens band and Class C remote control frequencies FCC regulations permit only transmissions one party to another rather than broadcasts to a wide audience Thus advertising is not allowed on CB Channels because that is broadcasting S UND FRACKER QU SYSTEM Cuts Static coming in adds Punch going out Cobra proudly introduces the first Patent Pending technology that dramatically improves the transmission and reception of CB radio signals This revolutionary system reconfigures the transmission signal which allows it to be transferred more effectively through cluttered airwaves It literally punches your message through the hundreds of thousands of signals that are in the air At the same time SoundTracker system dynamically adjusts the relationship between the signal and static commonly referred to as noise This allows Cobra s SoundTracker system to significantly reduce the amount of static on all incoming CB signals The system can be further optimized when two SoundTracker CB s are used to talk to each other The end r
21. ons This limited warranty does not apply 1 to any product damaged by accident 2 in the event of misuse or abuse of the product or as a result of unauthorized alterations or repairs 3 if the serial number has been altered defaced or removed 4 if the owner of the product resides outside the U S A All implied warranties including warranties of merchantability and fitness for a particular purpose are limited in duration to the length of this warranty COBRA shall not be liable for any incidental consequential or other damages including without limitation damages resulting from loss of use or cost of installation Some states do not allow limitations on how long an implied warranty lasts and or do not allow the exclusion or limitation of incidental or consequential damages so the above limitations may not apply to you This limited warranty gives you specific legal rights and you may also have other rights which vary from state to state Cobra Electronics Corporation 6500 W Cortland Street Chicago IL 60707 18 OPTIONAL ACCESSORIES You can find these fine accessories at your local Cobra CB dealer Description Part No Cost Ea X Qty Amount DYNAMIC MICROPHONE Replacement microphone with 4 pin screw on connector CA 73 19 95 DC POWER CORD Exact replacement 426 002 N 001 7 50 MOUNTING BRACKET Exact replacement 251 199 9 001 4 50 MOUNTING BRACKET SCREWS Exact replacements 634 081 9 001 60 ea POWER MICROPHONE
22. s manual for the correct procedure for warranty and post warranty service from COBRA Adjustment Warning Replacement or substitution of certain parts with replacements other than those recommended by COBRA may be a violation of the technical regulations of Part 95 of the FCC Rules or of Type Acceptance requirements of Part 2 of said rules When making adjustments other than transmitter adjustments be sure to re read applicable portions of this instruction manual to make certain you are following correct procedure and that the radio was properly installed etc For technical assistance please call our Automated Help Desk which can assist you by answering the most frequently asked questions about Cobra products 773 889 3087 24 hours a day 7 days a week A Consumer Service Representative can be reached through this same number 8 00 am 8 00 pm Monday through Friday CST Technical assistance is also available on line in the Frequently Asked Question FAQ section at www cobraelec com or by e mail to productinfo cobraelec com 14 Appendix Citizens Band radio operators have largely adopted the 10 code for standard questions and answers Its use permits faster communications and better under standing in noisy areas The following table lists some of the more common codes and their meanings Code Meaning Code Meaning 10 1 Receiving poorly 10 35 Confidential information 10 2 Receiving well 10 36 Correct tim
23. side it Mounting and Connection The transceiver is held in the universal mounting bracket by two thumbscrews permitting adjustment at the most convenient angle A universal mounting bracket is supplied along with self tapping screws and star washers The mounting must be mechanically strong and also provide a good electrical connection to the chassis of the vehicle To mount the transceiver 1 Determine the most convenient location in your vehicle hold the COBRA radio with mounting bracket in the exact location desired If nothing will interfere with mounting it in the desired position remove the mounting bracket and use it as a template to mark the location for the mounting screws 2 Drill necessary holes and secure mounting bracket in location Installation Cont 4 Connect the antenna cable plug to the standard receptacle on the unit Most CB antennas are terminated with a type PL 259 plug which mates with the receptacle marked ANT Connect the red lead of DC power cord to 13 8 VDC In automobile instal lations 13 8 VDC is usually obtained from the accessory contact in the fuse box This prevents the set being left on accidentally and also permits oper ating the unit without the vehicle s engine running Before installing the CB radio visually check the vehicle battery connec tions to determine which battery terminal positive or negative positive is the larger of the two is grounded to
24. t 4 watts Modulation AM Amplitude Modulation Frequency Response 300 to 3000 Hz Output Impedance 50 ohms unbalanced RECEIVER Sensitivity Less than 1 uV for 10dB S N N Selectivity 6dB 7 KHz 60 dB 10 KHz Image Rejection Adjacent Channel Rejection IF Frequencies 80 dB typical 60 dB typical Double Conversion 1st 10 695 MHz 2nd 455 KHz Less than 10 dB change in audio output for inputs from 10 to 50 000 microvolts Adjustable for optimum signal reception Automatic Gain Control AGC RF Gain Control Noise Blanker RF type Squelch Adjustable threshold less than 10 Audio Output Power 4 watts Frequency Response 300 to 3000 Hz Distortion Less than 7 3 watts 1000 Hz 16 ohms round 8 ohms disables internal speaker when connected Built in Speaker External Speaker Not Supplied PA SYSTEM Power Output 4 watts into external speaker External Speaker for PA 8 ohms when PA CB switch is in PA the PA speaker Not Supplied also monitors the receiver separate jack provided SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE 3 Installation Location Plan the location of the transceiver and microphone bracket before starting the installation Select a location that is convenient for operation and does not inter fere with the driver or passengers in the vehicle In automobiles the transceiver is usually mounted to the underneath of the dash panel with the microphone bracket be
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