Cobra Electronics 150GTLDX Two
Contents
1. Tuning the Antenna for Optimum SWR Because such a wide variety of base and mobile antennas are available this section will concern itself only with the usual types of mobile adjustable antennas Antenna length is directly related to signal frequency Therefore it must be tuned to resonate optimally throughout the frequency range of the transceiver Lower frequencies require a longer antenna than higher frequencies Due to the various methods of adjusting antennas for proper SWR we have chosen what we think is the optimum method A Antennas with adjustable screws setscrews 1 Start with the antenna extended and tighten the setscrew lightly enough so that the antenna can be lightly tapped with your finger for easy adjustment oet your mobile radio to your desired operating frequency or the center of the range of frequencies you plan to use Press the PTT Press To Talk switch and tap the antenna making it shorter The SWR meter will show a lower reading each time the antenna is tapped By continuing to shorten the antenna you will notice the SWR reading will reach a low point and then start rising again This means that you have passed the optimum point for the middle frequency Extend the antenna a short distance and again follow the procedure above When the lowest point has been reached switch to 28 0 MHz and then to 29 7 MHz and compare SWR readings They should be almost equal B Antennas that must be cut2. SWR CAL outer ring Dual 7 Segment Frequency Display Frequency Selector Antenna Connector Frequency Counter Connector Microphone Press To Talk e Button PTT Features A WARNING RISK OF ELECTRIC SHOCK DO NOT OPEN DO NOT REMOVE COVER OR BACK NO USER SERVICEABLE PARTS INSIDE REFER TO SERVICING TO QUALIFIED SERVICE PERSONNEL P 341 Operating Frequencies Allows operation on all available frequencies gt 15 Watts Output Power Provides maximum power on AM and FM Dual Finals Provides steady output power gt Dual Power Allows operation on Low and High power SWR Calibration Allows measurement and adjustment of the antenna system gt Antenna Warning Indicator Illuminates when the antenna system needs repair or adjustment gt Echo Control Allows control of echo effect gt Talk Back Control Allows user to monitor feedback of output signal Large Analog Meter Provides high visibility of status meter gt NightWatch Panel Electroluminescent illumination of front panel for night operation gt 4 Pin Front Mic Connector Allows convenient installation in dash gt Frequency Counter Jack Allows connection of a 6 digit frequency counter gt Mic Gain Control Allows increased voice clarity by dynamically boosting microphone This Cobra radio has a superior receiver that includes an RF gain control and noise blank
3. N Cobra Owner s Manual RF POWER SIRF MB ANL RX TK i HI 10KHz P P ec l P ae ED ii LOW OFF Cobra 150 GTL DX lg gt Nice AMATEUR 10 METER MOBILE RADIO Printed in Philippines Part No 480 216 P Version A Nothing comes close to a Cobra English Introduction k Our Thanks to You Thank you for purchasing a Cobra amateur mobile radio Properly used this Cobra product will give you many years of reliable service FCC License Required The United States Federal Communications Commission FCC requires that users of the frequencies on which this radio operates be licensed See page 16 for licensing and other FCC information 2005 Cobra Electronics Corporation 6500 West Cortland Street Chicago Illinois 60707 USA www cobra com English Introduction Introduction Controls and Indicators S RF SWR CAL e RX TX RF Power Indicator Hi Low e NB ANL PA AM FM dob EET Off Off Analog Band Meter AIB C D d S Cobra 150 GTL DX IPNCHTVVATCH Microphone Gain Microphone center knob Connector RF Gain e outer ring Off On Volume center knob Squelch outer ring Public Address PA Speaker Connector External Speaker Connector Power Cord Connector English center knob Talk Back outer ring 3 9 Antenna Warning Echo Indicator Dim center knob
4. The wires must now be soldered to the pins as indicated in the wiring table If a vise or clamping tool is available it should be used to hold the pin receptacle body during the soldering operation so that both hands are free to perform the soldering If a vise or clamping tool is not available the pin receptacle body can be held in a stationary position by inserting it into the microphone jack on the front panel The numbers of the pins of the microphone plug are shown in Fig 4 as viewed from the back of the plug Before soldering the wires to the pins pre tin the wire receptacle of each pin of the plug Be sure that the housing and the knurled ring of Fig 3 are pushed back onto the microphone cable before starting to solder If the washer is not captive to the pin receptacle body make sure that it is placed on the threaded portion of the pin receptacle body before soldering If the microphone jack is used to hold the pin receptacle during soldering operation best results are obtained when the connections to pins 1 and 3 are made first and then the connections to pins 2 and 4 Use a minimum amount of solder and be careful to prevent excessive solder accumulation on pins which could cause a short between the pin and the microphone plug housing When all soldering connections to the pins of the microphone are complete push the knurled ring and the housing forward and screw the housing onto the threaded portion of the pin receptacle bo
5. Radio ARRL Q Signals QSD QSG QSK Is my keying defective Your keying is defective Shall send messages at a time Send messages at a time Can you hear me between your signals and if so can I break in on your transmission can hear you between my signals break in on my transmission Can you acknowledge receipt am acknowledging receipt Shall repeat the last message which sent you or some previous message Repeat the last message which you sent me or message s number s Did you hear me or on kHz did hear you or on KHz Can you communicate with direct or by relay can communicate with direct or by relay through Will you relay to will relay to General call preceding a message addressed to all amateurs and ARRL members This is in effect CQ ARRL shall send or reply on this frequency or on kHz send or reply on this frequency or KHz shall send a series of Vs on this frequency or on KHz send a series of Vs on this frequency or on KHz Will you send on this frequency or on kHz am going to send on this frequency or on KHz Will you listen to on kHz am listening to on kHz Shall change to transmission on another frequency Change to transmission on another frequency or on kHz Shall send each word or group more than once send each word or group twice or times Shall cancel message number Cancel message number Do you agree with my counting of w
6. to change without notice The Cobra line of quality products includes CB Radios microTALK Radios Radar Laser Detectors Safety Alert Traffic Warning Systems Handheld GPS Receivers Mobile GPS Navigation Systems HighGear Accessories CobraMarine VHF Radios Power Inverters Accessories State Province Zip Postal Code Country Type OVisa O MasterCard O Discover Exp Date U S Cost Each Qty Amount Tax Table California 7 25 Michigan 6 Illinois 8 75 Ohio 6 Indiana 6 Wisconsin 5 U S Subtotal Tax if Applicable Shipping Handling Total Optional Accessories You can find quality Cobra products and accessories at your local Cobra dealer or in the U S A you can order directly from Cobra Ordering from U S A Call 773 889 3087 for pricing or visit www cobra com For credit card orders complete and return this order form to fax number 773 622 2269 Or call 773 889 3087 Press 1 from the main menu 8 00 a m to 6 00 p m CT Monday through Friday Make check or money order payable to Cobra Electronics Attn Accessories Dept 6500 West Cortland Street Chicago IL 60707 USA To order online please visit our website www cobra com Nothing comes close to a Cobra 25 The Cobra line of quality products includes CB Radios microTALK Radios Radar Laser Detectors Safety Alert Traffic Warning Systems Handheld GPS Receivers Mobile GPS Navigation Syste
7. to proper length 1 Follow the procedure as in A above but adjust the length by cutting in increments until a good match is obtained Be very careful not to cut too much off the antenna at one time Once it is cut it can no longer be lengthened The whip is easily cut by filing a notch all the way around then breaking the piece off with pliers NOTE The proper setting is achieved when the SWR is 1 5 or below and when it has the same reading for the low and high frequencies in the range you plan to use Nothing comes close to a Cobra A Your Mobile Radio Installation and Connection If you are having difficulties in adjusting your antenna check the following 1 All doors must be closed when adjusting the antenna 2 Make sure the antenna base is grounded 3 Check your coaxial cable routing it may be pinched where routed into the car 4 Try a different location on your car keeping in mind the radiation pattern you want 9 Make sure the antenna is perfectly vertical 6 Try a different location in your neighborhood Stay away from large metal objects metal utility or light poles fences etc when adjusting NOTE The radio will operate into a SWR of 2 to 1 indefinitely and sustain an SWR of 20 to 1 for a maximum of 5 minutes at rated operating conditions External Speaker The external speaker jack EXT on the rear panel is used for remote receiver monitoring The external speak
8. Grounding 2 Audio Lead 3 Transmit Control 4 Receive Control If the microphone to be used is provided with pre cut leads they must be revised as follows 1 Cut leads so that they extend s beyond the plastic insulating jacket of the microphone cable see Fig 2 2 All leads should be cut to the same length Strip the ends of each wire 14 and tin the exposed wire Before beginning the actual wiring read carefully the circuit and wiring information provided with the microphone you select Use the minimum heat required in soldering the connections Keep the exposed wire lengths to a minimum to avoid shorting when the microphone plug is reassembled Nothing comes close to a Cobra e Your Mobile Radio Alternate Microphones lati Alternate Microphones and Installation Fig 2 Microphone cable preparation Fig 3 Microphone plug wiring English 7 36 1 8 STRIP amp TIN KNURLED RING HOUSING Y i CABLE CLAMP RETAINER SCREW 12 RETAINING SCHEW A MICROPHONE CONNECTOR ASSEMBLY Alternate Microphones Qo lati Your Mobile Radio Alternate Microphones and Installation To wire the microphone cable to the plug provided proceed as follows 1 Remove the retaining screw 2 Unscrew the housing from the pin receptacle body 3 4 Feed the microphone cable through the housing knurled ring and Loosen the two cable clamp retainer screws washer as shown Fig 3B
9. Variable 3 Bad Are you receiving me badly cannot receive you Your signals are too weak What is the intelligibility of my signals or those of The intelligibility of your signals or those of is 1 Bad 2 Poor 3 Fair 4 Good 5 Excellent Are you busy am busy or am busy with Please do not interfere Is my transmission being interfered with Your transmission is being interfered with 1 Nil 2 Slightly 3 Moderately 4 Severely 5 Extremely Are you troubled by static am troubled by static 1 5 as under QRM Shall increase power Increase power Shall decrease power Decrease power shall send faster Send faster WPM shall send more slowly Send more slowly ____ WPM Shall I stop sending Stop sending Have you anything for me have nothing for you Are you ready am ready Shall inform that you are calling on kHz Please inform that am calling on KHz When will you call me again I will call you again at on kHz What is my turn Your turn is numbered Who is calling me You are being called by on kHz What is the strength of my signals or those of The strength of your signals or those of is 1 Scarcely perceptible 2 Weak 3 Fairly Good 4 Good 5 Very Good Are my signals fading Your signals are fading QSL QSM QSN QSO QSP QST QSU QSV QSW QSX QSY QSZ QTA QTB QTC QTH QTR QTV QTX QUA Your Mobile
10. control gt SWR CAL This control is used in conjunction with the S RF SWR CAL switch to calibrate the standing wave ratio circuit to full scale on the display meter in preparation for measuring the standing wave ratio that the antenna is presenting to the transceiver The standing wave ratio can be checked to insure that maximum power is being radiated for the longest signal range The antenna must be in good condition properly adjusted and matched to your transceiver The SWR function of the display meter lets you easily measure your antenna condition To operate this function select a frequency near the middle of the range such as 28 850 MHz or the one you plan to use most With the power on set the S RF SWR CAL switch to the CAL position Press and hold the microphone Press To Talk button and using the SWR CAL knob adjust the meter to the CAL position indicated on the display meter Then while releasing the microphone button switch the S RF SWR CAL switch to the SWR position Again press and hold the microphone Press To Talk button and read the SWR indicated Lower figures are the better with 1 being ideal Generally readings up to 3 are acceptable but a reading greater than 3 indicates that you are losing radiated power and antenna adjustment may be advisable English M o A Your Mobile Radio Controls NB ANL ANL Off When this switch is in the ANL position only the automatic noise limiter in the audio c
11. dy Note the location of the screw clearance hole in the plug housing with respect to the threaded hole in the pin receptacle body When the housing is completely threaded into the pin receptacle body a final fraction of a turn either clockwise or counterclockwise may be required to align the screw hole with the threaded hole in the pin receptacle body When these are aligned the retaining screw is then screwed into place to secure the housing to the pin receptacle body The two cable clamp retainer screws should now be tightened to secure the housing to the microphone cord If the cutting directions have been carefully followed the cable clamp should secure to the insulation jacket of the microphone cable Upon completion of the microphone plug wiring connect and secure the microphone plug in the transceiver iS Nothing comes close to a Cobra Your Mobile Radio ARRL Q Signals The most commonly used are shown bold Some have slightly modified meanings in everyday usage The official list follows QRA QRG QRH QRI QRJ QRK QRL QRM QRN QRO QRP QRQ QRS QRT QRU QRV QRW QRX QRY QRZ QSA QSB English What is the name of your station The name of your station is Will you tell me my exact frequency or that of Your exact frequency or that of is KHz Does my frequency vary Your frequency varies How is the tone of my transmission The tone of your transmission is 1 Good 2
12. engers in the vehicle In automobiles the transceiver is usually mounted below the dash panel with the microphone bracket beside it Mounting Your mobile radio is supplied with a universal mounting bracket When mounting the bracket and radio to your car make sure it is mechanically strong Also provide a good electrical connection to the chassis of the vehicle Proceed as follows to mount the transceiver gt Mount the Transceiver 1 After you have determined the most convenient location in your vehicle hold the mobile radio with the mounting bracket in the exact location desired If nothing will interfere with mounting it in the desired position remove the thumbscrews and use the mounting bracket as a template to mark the holes for the mounting screws Before drilling the holes make sure nothing behind the surface will be damaged or interfere with the installation 2 Connect the antenna cable plug to the standard receptacle ANT on the rear panel Most antennas are terminated with a type PL 259 plug and mate with the receptacle 3 Connect the red DC power input wire with the fuse to 13 8 V DC This wire extends from the rear panel Connect directly to positive terminal red of vehicle s battery 4 Connect the black lead to 13 8 V DC This is usually the chassis of the car Any convenient location with good electrical contact remove paint may be used 9 Mount the microphone bracket on either side of the transceiver
13. er Assistance Product SCI VICE E oe 23 ACCCSSONCS cens acc axdtemd sr dini wes eudt d edad qe dm dep dd 24 Order Form and Optional Accessories 0 0 0 0 cece eee eee 25 Nothing comes close to a Cobra n e Your Mobile Radio Specifications Frequency Range Frequency Control Frequency Stability Operating Temperature Range Antenna Impedance Antenna Connector Microphone Input Voltage Current Drain Size Weight Meter 3 in 1 Built in Speaker 28 0 to 29 7 MHz Phase Lock Loop PLL synthesizer 0 005 22 F to 122 F 6 C to 50 C 50 ohms otandard SO 239 type Plug in dynamic with Press To Talk switch and coiled cord 13 8 V DC nominal 15 9 V max 10 0 V min positive or negative ground Transmit 3 0 A Receive squelched 0 5 A Receive maximum audio output 1 2 A 2 H x 77 W x 9 D 6 cm H x 20 cm W x 24 8 cm D 4 8 Ibs Illuminated indicates relative output power received signal strength and SWR 4 watts Power Output Frequency Response Frequency Tolerance Transmit Distortion opurious Harmonic Emission Output Indicators Antenna Warning LED 2 English Low 4 watts High 15 watts 300 to 3 000 Hz 900 Hz 2 65 dB Meter shows relative RF output power and SWR Transmit LED glows red whe
14. er circuitry as well as an automatic noise limiter The receiver also features increased protection against cross modulation and strong adjacent signals To obtain maximum performance please read carefully the descriptions and operating instructions in this manual English Introduction e ac Introduction Our Thanks to You MP A1 FCC License Required 0 0 cc cc ccc cee eens A1 Contos ANG MACAO ict taney Para fera dca CARCER SIREC o E EUR A2 Venom qeC T T A3 acid F A3 Your Mobile Radio SOCCIIGATOMS xcacunnarankd ucc acea kaaa a Grade d cR SR RCROR GRE eia d 2 Included in this Package audae cd x deae eg X ER dE ORO a e pe cn tre a 4 Installation and Connection 00 0 c cece mmm D OE a iu cit PE EE oe EE made S TE 8 Pin e vous ae buen E Saad wae E he E EEE 9 Frequency ieiseeseeh mana har ar aan 12 Hcr P T E 14 Vilfego 9 DUI REPRESENTS TTE TIT TT TET 14 Operating to Receive 0 ccc RR 15 Operating to Transmit u usc a decade oc e cl we wate icd 15 MGINECHANCE RRTRETTTQTTETOOOOTTTTOT OTI TTE 16 Government Regulatory Information 0 0 cece eee eee 16 Alternate Microphones and Installation 0 0 cece eee 17 ARRL Q Signals 0 0 0 tte teens 20 Warranty rcg ereer le hee te siege oD se hc th ae gene ee dy gees 22 Trademark Acknowledgement 0 cc cee eee eee ees 22 Custom
15. er should have 8 ohms impedance and be able to handle at least four watts When the external speaker is plugged in the internal speaker is disabled Public Address To use the transceiver as a public address system connect an external 8 ohm speaker that is able to handle at least four watts to the PA jack on the rear panel Direct the speaker away from the microphone to prevent acoustic feedback Physical separation or isolation of the microphone and speaker is important when operating the PA at high output levels Operation There are 15 controls and 4 indicators on the front panel of your mobile radio These are shown in the illustration on page A2 which may be folded out for reference when using this section English Your Mobile Radio Controls Off On Volume Turn clockwise to apply power to the unit and to set the desired listening level During normal operation the volume control is used to adjust the output level obtained either at the transceiver speaker or the external speaker if used gt Squelch This control is used to cut off or eliminate receiver background 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 Turn fully counterclockwise then slowly clockwise until the receiver noise disappears Any signal to be received must now be s
16. he source of severe noise gt Antenna In addition to transmitter power the antenna is an 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 etc an antenna system that is non directional should be used A vertically polarized quarter wavelength whip antenna provides the most reliable 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 When mounted at a corner of the vehicle they are slightly directional in the direction of the body of the vehicle For all practical purposes however the radiation pattern is non directional 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 If the transceiver is not mounted on a metal surface it is necessary to run a separate ground wire from the unit to a good metal electrical ground in the vehicle s English Your Mobile Radio Installation and Connection
17. include the following information Date of Purchase Model Number Dealer Purchased From Dealer Address Dealer Phone Number For Products Used in Canada Industry Canada Notice Operation is subject to the following two conditions 1 this device may not cause interference and 2 this device must accept any interference including interference that may cause undesired operation of this device gt For Products Purchased Outside the U S A or Canada Please contact your local dealer for product service information Nothing comes close to a Cobra 23 4 Customer Assistance Accessories 4 Pin Premium Noise Cancelling Microphone HG M84 74 95 Dynamic External Speaker HG S100 21 95 24 English 4 Pin Premium Noise Cancelling Microphone HG M84W 74 95 Wood Grain Noise Canceling External Speaker HG S300 28 95 Customer Assistance Order Form Name Address No P O Boxes City Telephone Credit Card Number Customer Signature Amount Shipping Handling 10 00 or less 3 00 10 01 25 00 5 50 25 01 50 00 7 50 50 01 90 00 10 50 90 01 130 00 13 50 130 01 200 00 16 50 200 01 10 of purchase For AK HI and PR add additional 26 95 for FedEx Next Day or 10 95 for FedEx 2nd Day Excludes weekend and holiday shipments Please allow two to three weeks for delivery in the U S Prices subject
18. ircuits is activated When the switch is placed in the NB ANL position the RF noise blanker also is activated The RF noise blanker is very effective for repetitive impulse noise such as ignition interference When the switch is in the off position both the noise blanker and the automatic noise limiter are disabled gt Echo This control is used to adjust the output level of the echo circuit It is also detented at the fully counter clockwise position to turn off the echo circuit gt Talk Back This control is used to adjust the desired amount of modulation talk back that is present at the speaker during transmit Nothing comes close to a Cobra I Your Mobile Radio Frequency Three controls and one indicator are used together to set and display the radio frequency on which your mobile radio will receive and transmit signals In this connection it is important to understand the frequency bands built into the unit and the way they are displayed on the Dual 7 Segment Display The 10 meter frequency range is broken down into four bands on your mobile radio These are selected using the Band A B C D knob Band Frequency Range MHz A 28 000 28 495 B 28 500 28 995 C 29 000 29 495 D 29 500 29 700 Within each band frequencies can be selected in 5 kHz increments such as 28 005 MHz in Band A or 29 455 MHz in Band C These are selected using the Frequency Selector knob after the band has been cho
19. lation section on page 17 English Operating to Receive and Operating to Receive To begin operating your radio 1 2 Be sure the power source microphone and antenna are properly connected Turn the unit on by turning the volume knob clockwise and set the volume for a comfortable listening level 3 oet the PA AM FM switch to the desired AM or FM 4 Set the RF gain control fully clockwise for maximum RF gain 9 Listen to the background noise from the speaker then turn the squelch ring slowly clockwise until the noise just disappears no signal should be present Leave the control at this setting The squelch is now properly adjusted 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 6 Select the desired frequency with the band and frequency selector knobs 7 Adjust other controls as desired Operating to Transmit To transmit a signal 1 2 3 select the desired frequency for transmission if different from the one chosen to receive set the microphone gain knob fully clockwise If the frequency is clear depress the Press To Talk switch on the microphone and speak in a normal voice Nothing comes close to a Cobra 15 e Your Mobile Radio Maintenance The transceiver is specifically designed for the environment encountered in mobile installations The use of all solid s
20. lightly stronger than the average received noise Further clockwise rotation will increase the threshold level that a signal must overcome in order to be heard Only strong signals will be heard at the maximum clockwise setting gt Microphone Gain Adjusts the microphone gain in the transmit and PA modes This 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 for the PA speaker gt RF Gain Used to reduce the gain of the RF amplifier when receiving very strong signals gt PA AM FM selects the mode of operation In the AM and FM positions the PA function is disabled and the unit will transmit and receive on the internal speaker In the PA mode incoming transmissions will be heard through the PA speaker This allows you to monitor messages while outside of your vehicle To use the PA feature a speaker having a voice coil impedance of 8 ohms and a power handling capability of at least four watts should be used This speaker must be plugged into the PA SPKR jack at the rear of the transceiver If the public address feature is to be used primarily for outdoor applications the use of a weatherproof horn type public address speaker is recommended The durability of this type speaker plus the inherent efficiency of such a speaker will provide more than adequate results when combined with the high audio ou
21. ms HighGear Accessories CobraMarine VHF Radios Power Inverters Accessories Nothing comes close to a Cobra English
22. n the operating frequency is increased or decreased by 5 kHz with each click of the frequency selector knob When it is in the 10 kHz position faster tuning is available because the operating frequency is increased or decreased by 10 kHz with each click of the frequency selector knob Nothing comes close to a Cobra 13 Your Mobile Radio Indicators gt Analog Meter The meter needle swings proportionally to the strength of the incoming signal or RF output power in receive or transmit modes When used to tune the antenna or monitor the quality of the coaxial cable and RF electrical connections the needle swings proportionally to the ratio of standing wave ratio and RF output If there is any degradation in these due to humidity Salt spray vibration or corrosion the SWR meter reading will rise thereby indicating that a problem exists RX TX Indicator This indicator glows green when in receive mode and red when in transmit mode Antenna Warning Indicator This indicator glows red whenever the standing wave ratio is greater than 3 to 1 Microphone The receive and transmit modes are controlled by the Press To Talk PTT switch on the microphone Press the switch to transmit release it to receive When transmitting hold the microphone two inches from the mouth and speak clearly in a normal voice To substitute for the supplied low impedance 500 ohm dynamic microphone see the alternate microphones and instal
23. n transmitter is in operation Glows red when SWR is greater than 3 0 e Your Mobile Radio Specifications Sensitivity AM 0 5 uV for 10 dB S N FM 0 25 uV for 12 dB S N Audio Frequency Response 300 to 3 000 Hz Maximum Signal to Noise Ratio ve HE Image Rejection 75 dB Adjacent 65 dB Channel Rejection RF Gain Control AGC 40 dB adjustable for optimum signal reception squelch Adjustable threshold less than 0 5 uV Automatic Noise Limiter ANL E Noise Blanker NB owitchable Receive Indicators Meter shows relative signal strength Receive LED glows green when receiving a signal PA System Power Output 4 watts into PA speaker Speaker for PA Not Supplied External Speaker Power Output 4 watts into external speaker 8 ohms External Speaker Not Supplied Ne Specifications subject to change without notice Nothing comes close to a Cobra 5 Included in this Package You should find all of the following items in the package with your radio Universal Mounting Bracket Operating Instructions Your Mobile Radio Installation and Connection Refer to the illustration on page A3 for connection points on the back of the unit while installing your radio Location Plan the location of the transceiver and microphone brackets before starting the installation Select a location that is convenient for operation and does not interfere with the driver or pass
24. ords do not agree with your counting of words will repeat the first letter or digit of each word or group How many messages have you to send have messages for you or for What is your location My location is What is the correct time The correct time is Shall stand guard for you Stand guard for me Will you keep your station open for further communication with me Keep your station open for me Have you news of have news of Nothing comes close to a Cobra 21 Limited Two Year Warranty For Products Purchased in the U S A Cobra Electronics Corporation warrants that its Cobra radios and the component parts thereof will be free of defects in workmanship and materials for a period of two years from the date of first consumer purchase 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 radios products or component parts 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 warranty service but the return charges will be at Cobra s expense if the product is repaired or replaced under warranty This warranty gives you specific legal rights and you may also have other rights which may vary from state to state Exclusions This limited wa
25. rranty 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 For Products Purchased Outside the U S A Please contact your local dealer for warranty information Trademark Acknowledgement Cobra Nothing comes close to a Cobra and the snake design are registered trademarks of Cobra Electronics Corporation USA Cobra Electronics Corporation is a trademark of Cobra Electronics Corporation USA 22 English Customer Assistance Product Service If you have any questions about operation or installing your new Cobra product or if you are missing parts Please call Cobra first DO NOT RETURN THIS PRODUCT TO THE STORE For Products Purchased in the U S A If your product sho
26. sen Dual 7 Segment Frequency Display Frequencies are displayed on the Dual 7 Segment Frequency Display using a combination of numerical figures and decimal points The figures indicate the first two values after the decimal point in the frequency such as the 00 in 28 005 MHz The right hand decimal point in the display indicates whether the third value after the decimal point in the frequency is 0 or 5 if the right hand decimal is visible on the display the third value is 5 if it is not visible the third value is 0 The left hand decimal point in the display between the two figures indicates whether the two values before the decimal point in the frequency are 28 or 29 if the left hand decimal is visible on the display the first two values are 29 If it is not visible the first two values are 28 Refer to the examples in the following table Channel Display Frequency Display Frequency 00 28 000 m D gt 0 0 28 005 f j m 0 0 29 000 i 8005 cum e 39 28 350 4 5 28 455 25 29250 28 29 MHz 0 5 kHz 6 3 29 635 i2 English Your Mobile Radio Frequency gt BandA B C D This control selects the desired frequency band gt Frequency Selector This detented control is a 360 multi position switch used to increase or decrease the operating frequency in 5 or 10 kHz steps within the selected band gt 10 kHz Off When this switch is in the off positio
27. tate circuitry and its light weight result in high reliability Should a failure occur however replace parts only with identical parts Do not substitute NOTE If the performance described in the operation sections is not obtained review the installation instructions to insure that proper procedures were followed If a problem still exists refer to the product service section on page 23 Government Regulatory Information This device complies with part 15 of the FCC Rules Operation is subject to the condition that this device does not cause harmful interference Transmitting using this radio requires an Amateur Radio License If you live in the United States visit http www fcc gov or http www arrl org for further licensing information In Canada visit http strategis ic gc ca or http www rac ca English Alternate Microphones Qo nd Installation Your Mobile Radio Alternate Microphones and Installation For best results the user should select a low impedance dynamic type microphone or a transistorized microphone Transistorized type microphones have a low output impedance characteristic The microphone must be provided with a four lead cable The audio conductor and its shielded lead comprise two of the leads The third lead is for receive control the fourth is for transmit control The microphone should provide the functions shown in the schematic below gt 4 Wire Mic Cable Pin Number Mic Cable Lead 1
28. tput level available from your radio With the PA speaker connected as outlined previously be sure that there is physical separation between the microphone and the speaker itself If the speaker is located too close to the microphone acoustic feedback will result when the public address system is operated at high volume A directional type outdoor speaker reduces the amount of isolation required Some experimentation will determine the minimum amount of isolation required for a given sound level from the public address system NOTE The microphone gain knob also controls the PA volume when in PA mode Nothing comes close to a Cobra 3 Your Mobile Radio Controls gt RF Power Hi Low Places the transmitter in high power 15 watts mode when the switch is in the hi position and in low power 4 watts mode when it is in the low position gt S RF SWR CAL When this switch is in the S RF position the display meter swings proportionally to the strength of the signal received or the output power being transmitted When it is in the SWR position the standing wave ratio is measured on the display meter When it is in the CAL position the SWR function can be calibrated on the display meter by adjusting the SWR CAL control to move the needle to the calibration mark on the display meter face gt Dim Adjusts the NightWatch panel and meter brightness from min to max The antenna warning LED is not affected by this
29. uld require service please call at 800 638 3680 to obtain a repair authorization number and the address to which to send your radio This will ensure the fastest turnaround time on your repair It will be necessary to furnish the following to have the product serviced and returned 1 For warranty repair include some form of proof of purchase such as a mechanical reproduction or carbon of a sales receipt If you send the original receipt it cannot be returned 2 Send the entire product 3 Enclose a description of what is happening with the radio Include a typed or clearly printed name and address of where the radio is to be returned 4 Pack radio securely to prevent damage in transit If possible use the original packing material 9 Ship prepaid and insured by way of a traceable carrier such as United Parcel Service UPS or Priority Mail to avoid loss in transit 6 If the radio is in warranty upon receipt of your radio It will either be repaired or exchanged Please allow approximately three to four weeks before contacting Cobra for status If the radio is out of warranty a letter will automatically be sent informing you of the repair charge or replacement charge gt For Products Purchased in Canada For out of warranty service ship this product prepaid to AVS Technologies Inc 2100 Trans Canada Hwy S Montreal Quebec H9P 2N4 We reserve the right to repair or replace the radio with an equivalent product Please
30. using the two screws Supplied When mounting in an automobile place the bracket under the dash so the microphone is readily accessible 6 Attach the microphone cable to the connector on the face of the transceiver NOTE If power cables need to be shorter we recommend attaching a 10 amp fuse to positive cable red at least six inches from vehicle s battery Nothing comes close to a Cobra 5 Your Mobile Radio Installation and Connection gt Ignition Noise Interference Use of a mobile receiver at low signal levels is normally limited by the presence of electrical noise The primary source of noise in automobile installations is from the generator and ignition system in the vehicle Under most operating conditions when signal level is adequate the background noise does not present a serious problem However 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 your mobile radio has ANL and NB controls in some installations ignition interference may be high enough to make good communications impossible The electrical noise may come from several sources Many possibilities exist and variations between vehicles require different solutions to reduce the noise Consult your Cobra dealer or a two way radio technician for help in locating and correcting t
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