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How to Use Your 

Cobra 25 NW ST

Contents

Features

...........................................................................................1

The CB Story
Controls & Indicators

................................................................A2

Our Thanks to You

......................................................................A3

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

Features of This Product

• 40 CB Radio Channels

• SoundTracker

™ 

System 

• Heavy-Duty Dynamic

Microphone 

• Full 4 Watts AM RF Power Output

• 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 cord

1

CAUTION: TO REDUCE THE RISK OF ELECTRIC 

SHOCK DO NOT REMOVE COVER (OR BACK)

NO USER SERVICEABLE PARTS INSIDE

REFER SERVICING TO QUALIFIED SERVICE 

PERSONNEL

CAUTION

RISK OF ELECTRIC SHOCK

DO NOT OPEN

!

!

Summary of Contents for Cobra 25 NW ST

Page 1: ... 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 Features of This Product 40 CB Radio Channels SoundTracker System Heavy Duty Dynamic Microphone Full 4Watts AM RF Power Output Instant...

Page 2: ... 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 th...

Page 3: ...ive 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 4 5 Plug power cable into back of unit marked Power Be sure to observe polarity markings Mount the microphone bracket on the right side of t...

Page 4: ...e power output of the transmitter is limited by the IC FCC the antenna is critical in affecting transmission dis tance 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 Marine Installation The transceiver will not operate at maximum effi ciency in a boat...

Page 5: ...d micro phone are connected to their proper connectors before starting Setting Channel Selector 2 25 NW ST 1 Rotate the On Off Volume knob clockwise to a normal listening level Select one of forty channels and adjust volume The selected channel is indicated by the LED readout directly above the channel selector knob 1 MIN MAX MIN MAX 25 NW ST 25 NW ST ...

Page 6: ...ion 10 S Meter S Meter Swings proportionately to strength of incoming signal when receiving Switch to NOR to select desired channel 1 Selecting A Channel Selecting A Channel Note Switch to 9 Emergency or 19 Information for instant access to these channels 25 NW ST To Receive 1 To Receive 25 NW ST 25 N ...

Page 7: ...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...

Page 8: ...Dim controls the brightness of the front panel signal strength meter and channel display NOISE WEAK SIGNALS MEDIUM SIGNALS STRONG SIGNALS G AT E C L O S E D NOISE WEAK SIGNALS MEDIUM SIGNALS STRONG SIGNALS NOISE WEAK SIGNALS MEDIUM SIGNALS STRONG SIGNALS G AT E O P E N NOISE WEAK SIGNALS MEDIUM SIGNALS STRONG SIGNALS Gate open Gate closed Setting Squelch Full clockwise rotation closes the gate all...

Page 9: ... 3 NOISE WEAK SIGNALS MEDIUM SIGNALS STRONG SIGNALS G AT E Gate set to Desired Squelch Setting DSS SIG 1 3 5 7 9 30dB RF MIN MAX MIN MAX OFF 25 NW ST To Transmit To Transmit Caution 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 Select desired channel 1 MIN MAX M...

Page 10: ...y have to be reduced in some conditions SIG 1 3 5 7 9 30dB RF MIN MAX MIN MAX OFF 25 NW ST Transmit Push and hold mic 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 Release to receive 1 PUSH HOLD Transmit RF Meter RF Meter This meter swings proportionately to the RF output outgoing signal while tra...

Page 11: ...LL 60707 Connect an external speaker to the external speaker jack on the rear panel 1 PA Public Address PA Public Address Connect an external PA speaker to the PA jack on the rear panel Note Speaker should have 8 ohm impedance and be rated to handle at least 4 0 watts Note The speaker should be directed away from the microphone to prevent acoustic feedback Note Activity on the CB channel will be h...

Page 12: ...the Automatic Noise Limiter is activated This helps reduce noise created by the vehicle s electronics SIG 1 3 5 7 9 30dB RF MIN MAX M OFF 25 NW ST 1 When switched to NB position the RF Noise Blanker is activated providing increased noise filtration When switched to OFF position Noise Blanking Filtration will be turned off NB OFF Noise Blanker Switch Note The RF noise blanker is very effective in r...

Page 13: ...O3K229LTD COBRA MADE IN CHINA SERIAL NO 806135776 PRECISION ENGINEERED PRODUCT OF COBRA ELECTRONICS CORP CHICAGO ILL 60707 Base Station Operation From 120V AC House Current Base Station Operation From 120V AC House Current To operate your transceiver from home or office you will need a 13 8 volt DC Power Pack rated at a minimum of 2 amps and a properly installed base station antenna Warning Do not...

Page 14: ...annel 9 Emergency Messages Note If no response on channel 9 try channels 19 or 14 Warn of traffic problems Provide weather and road data Provide help in event of an emergency Provide direct contact with home or office Assist police by reporting erratic drivers Get local information to find destination Communicate with family and friends Suggest spots to eat and sleep Keep you alert while traveling...

Page 15: ...ol number 3 All quiet CB 10 Codes Citizen Bands have adopted the 10 CODES for standard questions and answers These codes provide quick and easy communication especially in noisy areas Following are some of the more common codes and meanings Code Meaning 10 1 Receiving poorly 10 2 Receiving well 10 3 Stop transmitting 10 4 OK message received 10 5 Relay message 10 6 Busy stand by 10 7 Out of servic...

Page 16: ...serve hotel room for 10 82 Reserve room for 10 85 My address is 10 91 Talk closer to mic 10 93 Check my frequency on this channel 10 94 Give me a long count 10 99 Mission completed all units secure 10 200 Police needed at The COBRA 25 NW ST transceiver represents one of the most advanced AM two way radios used as a Class D station in the Citizens Radio Service This unit features advanced Phase Loc...

Page 17: ... dB 7 KHZ 60 dB 10KHZ IMAGE REJECTION 80 dB TYPICAL ADJACENT CHANNEL REJECTION 60 dB TYPICAL IF FREQUENCIES DOUBLE CONVERSION 1ST 10 695 MHZ 2ND 455 KHZ AUTOMATIC GAIN CONTROL AGC LESS THAN 10 dB CHANGE IN AUDIO OUTPUT FOR INPUTS FROM 10 TO 50 000 MICROVOLTS RF GAIN RANGE 40 dB NOISE BLANKER RF TYPE SQUELCH ADJUSTABLE THRESHOLD LESS THAN 1µV AUDIO OUTPUT POWER 4 WATTS FREQUENCY RESPONSE 300 TO 300...

Page 18: ...ional Accessories Optional Accessories 35 34 21 Base Loaded Magnet Mount Antenna HG A1000 39 95 38 Base Loaded Magnet Mount Antenna HG A1500 59 95 4 Pin Premium Noise Cancelling Microphone Wood Grain HG M84W 89 95 4 Pin Replacement Dynamic Microphone HG M73 24 95 4 Pin Noise Canceling Microphone HG M77 39 95 Dynamic External Speaker HG S100 34 95 Noise Canceling External Speaker HG S300 39 95 Powe...

Page 19: ...ulations IC 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 broad casting What s Included with Your 25 NW ST 1 CB transceiver 6 DC power cord 2 Microphone 3 Transceiver bracket 1 4 Microphone bracket 5 Operating Manual 25 NW ST CB Radio Operating Instructions for your Cobra 25 NW...

Page 20: ...technology dramatically improves transmission and reception of CB signals The revolutionary SoundTrackerTM System recon figures the transmission signal which allows it to be transferred more efficiently through cluttered airwaves At the same time it significantly reduces the amount of static on all incoming CB signals The end result is a cleaner clearer sounding reception of signals and a more pow...

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