Cobra 25nwst Cb Tranciever Manual
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How to Use Your Cobra 25 NW STContents Features...........................................................................................1 The CB Story..................................................................................A1 FCC Regulations FCC Warnings Included Accessories Controls & Indicators................................................................A2 Our Thanks to You......................................................................A3 SoundTracker™ Customer Support Installation Location.......................................................................................2 Mounting and Connection...................................................2 Antennas CB Antenna................................................................................6 Marine Installation...................................................................6 Ignition Noise Interference...................................................7 Operating Your 25 NW ST Turning On Your CB.................................................................8 Setting Channel Selector.......................................................9 To Receive...................................................................................10 Selecting a Channel................................................................10 S-Meter.........................................................................................11 SoundTracker™ System.........................................................12 Activating SoundTracker™ ..................................................13 Dimmer Control........................................................................14 RF Gain Control.........................................................................14 Setting Squelch.........................................................................15 To Transmit.................................................................................17 Setting Dynamike....................................................................18 Transmit.......................................................................................19 RF Meter......................................................................................19 External Speaker.......................................................................20 PA (Public Address)..................................................................21 ANL (Automatic Noise Limiter) Switch.............................23 NB,OFF (Noise Blanker) Switch...........................................23 Temporary Mobile Set-Up.....................................................24 Home And Office Set-Up.......................................................25 How Your CB Can Serve You...................................................27 A Few Rules You Should Know............................................27 Channel 9 Emergency Messages.......................................27 CB 10 Codes...............................................................................29 Frequency Ranges......................................................................31 25 NW ST Specifications..........................................................32 Warranty Information..............................................................33 Optional Accessories.................................................................34 Order Form....................................................................................36 If You Think You Need Service.............................Back CoverFeatures of This Product •40 CB Radio Channels • SoundTracker™ System • Heavy-Duty Dynamic Microphone • Full 4 Watts AM RF Power Ou t p u t •Instant Channel 19 and 9 • Front Panel 4-Pin Microphone Connector • Switchable Noise Blanker • Switchable Automatic Noise Limiter • Adjustable Dynamike Boost • Tactile Controls •Illuminated Front Panel • Dimmer Control •RF Gain •9 ft.mic cord1 CAUTION: TO REDUCE THE RISK OF ELECTRIC SHOCK DO NOT REMOVE COVER (OR BACK) NO USER SERVICEABLE PARTS INSIDE REFER SERVICING TO QUALIFIED SERVICE P E R S O N N E L CAUTIONRISK OF ELECTRIC SHOCK DO NOT OPEN! !25 NWST Manual3.3 6/15/99 12:43 PM Page 1
Installation Installation Location32 Mounting and ConnectionMounting and Connection Hold the radio with the mounting bracket in the exact desired location.If there is no inter- ference, remove the bracket and use it as a template to mark the location for the mount- ing screws.Location Plan location of transceiver and microphone bracket before starting the installation. Select a location that is convenient for operation, yet does not inte rfe re with the dri ver or passenger. The transceiver is usually mounted to the under- side of the dash with the microphone bracket beside it. Note The transceiver is held in the universal mounting bracket by two thumbscrews which allow for adjustment at a convenient angle. The bracket includes two self- tapping screws and star wash- ers. The mounting must be mechanically strong, conve- niently located. continued Drill the holes and secure the bracket.21 Connect the antenna cable plug to the recep- tacle marked “ANT”on the back of the unit.325 NWST Manual3.3 6/15/99 12:43 PM Page 2
Installation Installation54Note Before installing the CB radio, visually check the vehicle’s battery connection to deter- mine which terminal,positive or negative,is grounded (pos- itive is the larger of the two) to the engine block (or chas- sis).A negatively grounded vehicle has its negative lead grounded to the chassis. Note Connecting to an accessory fuse prevents the unit from being left on accidentally,and also per- mits operating the unit without running the engine. Note In positive ground vehicles the red wire goes to the chassis and the black wire is connected to the ignition switch.In a negative grounded vehicle, connect the red lead of the DC power cord to an accessory 12 volt fuse. Connect the black lead to the negative side of the vehicle. This is usually the chassis. Any con- venient location with a good electrical contact (remove paint) may be used.45Plug power cable into back of unit marked “Power”. Be sure to observe polarity markings. Mount the microphone bracket on the right side of the unit (driver’s left) using two screws sup- plied. Bracket should be placed under the dash so microphone is readily accessible.67 Attach the 4-pin microphone cable to recepta- cle on front of unit and Install unit in bracket securely.825 NWST Manual3.3 6/15/99 12:43 PM Page 4
Ignition Noise Interference AntennasUse of a mobile receiver at low signal levels is normally limited by the presence of electrical noise. The primary source of noise in automobiles is from the alternator and ignition system. Typically,when signal level is adequate,the back- ground noise does not present a serious problem. Also,when extremely low level signals are being received,the transceiver may be operated with the vehicle’s engine turned off. The unit requires very little current and therefore will not signifi- cantly discharge the vehicle’s battery. Even though the Cobra 25 NW ST has an auto- matic noise limiter,in some installations ignition interference may be high enough to make good communications impossible. Many possibilities exist and variations between vehicles require different solutions. Consult your COBRA dealer or a 2-way radio technician for help in locating the source of a severe noise. CB Antenna Since the maximum allowable power output of the transmitter is limited by the FCC,the antenna is critical in affecting transmission distance.Only a properly matched antenna system will allow maximum power output.Cobra loaded type antenna models are highly recommended for most installations. Consult your Cobra dealer for further details,or call 773.889.3087 and speak to a Cobra representative. Marine Installation The transceiver will not operate at maximum effi- ciency in a boat without a ground plate,(unless it has a steel hull).Before attempting installation , consult your dealer for information regarding an adequate grounding system and prevention of electrolysis between fittings in the hull and water. CB Antenna7 Note For optimum performance in passenger cars the ideal anten- na location is on the center of the roof. Second choice is on the center of the trunk. Note Because many newer trucks feature fiberglass door skins,the outside mirror must be ground- ed to the chassis via a ground strap,if the antenna is mounted on the mirror bracket. Note 3-way Combination Antennas are also available which allow operation of all three bands (AM-FM & CB),using a single antenna.However,this type of antenna usually results in less than normal transmit and receive range when compared to a standard-type “Single Band”CB antenna.Call 773.889.3087 for further infor- mation.61 A standard antenna connector is provided on the transceiver for easy connection.25 NWST Manual3.3 6/15/99 12:43 PM Page 6
The CB/PA button should be in the CB position.Operation9Operation Turning OnSetting Channel Selector 8Turning On Make sure the power cord,antenna and micro- phone are connected to their proper connectors before starting.Setting Channel Selector 21 Ro t ate the On/Off Volume knob c l oc kw i s eto a normal listening level.Selectone of forty channels and adjust volume. The selected channel is indicated by the LED readout directly above the channel selector knob125 NWST Manual3.3 6/15/99 12:43 PM Page 8
Rotate the On/Off Volume knob clockwise the green RT/TX LED will be illiuminated.Operation11Operation10 S-MeterS-Meter Swings proportionately to strength of incoming signal when receiving. SwitchtoNOR to select desired channel.1 Selecting A ChannelSelecting A Channel Note Switch to 9 (Emergency) or 19 (Information) for instant access to these channels.To Receive1 To Receive25 NWST Manual3.3 6/15/99 12:43 PM Page 10
Operation Operation1312 Activating SoundTracker™Push and releasethe ST button.Red LED is illuminated when SoundTracker™ is turned on.1 The SoundTrackerTM System While previous systems only “blanket out”or limit noise in higher sound frequencies,the revolution- ary new SoundTrackerTM System actually reduces noise while leaving the signal intact in the recep- tion 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 SoundTrackerTM Works On Reception - “Cuts noise coming in” With a normal CB,distant signals fall below the squelch level and are unintelligible. With a SoundTrackerTM CB,the noise level is cut 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. On Transmission - “Strengthens signals going out” A SoundTrackerTM 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. Note SoundTracker™ gives you clearer,cleaner reception to improve CB communications while on the air.Activating SoundTracker™25 NWST Manual3.3 6/15/99 12:43 PM Page 12
Operation Operation1514 RF Gain Control Dimmer ControlRF Gain Control The RF Gain is used to optimize reception in strong or weak signal areas.Dimmer Control Note The RF Gain is used to optimize reception in weak signal areas.Rotatethe DIM knob clockwise for maximum brightness;counter-clockwise for minimum. Rotatethe RF Gain knob counterclockwise to reduce gain in strong signal areas.In weak signal areas turnclockwiseto increase gain.11 Note The Dim controls the brightness of the front panel,signal strength meter and channel display.Gate open Gate closed Setting SquelchFull clockwiserotation closes the gate allowing only very strong signals to enter.Full counterclockwiserotation opens the “gate”allowing all signals in. Setting Squelch Squelch is the “control gate” for incoming signals.2125 NWST Manual3.3 6/15/99 12:43 PM Page 14
To achieve the Desired Squelch Setting (DSS), turn the Squelch control counterclockwise until you hear noise. Now turn the control clockwisejust until the noise stops. This is the DSS setting.1716OperationOperation3Gate set to Desired Squelch Setting (DSS)To Transmit To TransmitCaution! Be sure the antenna is properly connected to the radio before transmitting. Prolonged trans- mitting without an antenna,or a poorly matched antenna, could cause damage to the transmitter. Be sure to read the F.C.C.Rules and Regulations included with this unit before transmitting. Selectdesired channel.125 NWST Manual3.3 6/15/99 12:43 PM Page 16
Setting Dynamike This controls the microphone sensitivity (outgoing audio level).1918Setting Dynamike OperationOperation1 Initially,set fully clockwiseso that maxi- mum voice volume is available. Dynamike may have to be reduced in some conditions.Transmit Push and holdmic button to transmit. Transmitter is now activated. When transmit- ting,hold the microphone two inches from your mouth and speak in a clear,normal voice. Releaseto receive.1 Transmit RF MeterRF Meter This meter swings proportionately to the RF output (outgoing signal) while transmitting.25 NWST Manual3.3 6/15/99 12:43 PM Page 18