Cobra GR-25LTD ST Operating Instructions Manual

GR25LTDST-English copy 6/21/99 12:00 PM Page 35

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Cobra Electronics Corporation

6500 West Cortland Street

Chicago, IL 60707 USA

www.cobraelec.com

G R

25 LTD ST

O pe rating Instru ctions for your Co b ra GR 25 LTD ST CB Ra d i o

Bedienungsanleitung für lhr Modell Co b ra GR 25 LT D S T C B -

Fu n kg e r ä t
I n s t ru ct i vo de uso de la radio de banda ciudadana (CB) Co b ra

G R 25 LT D S T

I n s t ru ctions d’ u t i l i s ation du po s te de radio CB GR 25 LT D S T
de Co b ra

Is t ruzioni per l’uso del modello Co b ra GR 25 LT D ST Radio CB

Cobra Electronics Corp.© 1999

“Ingenious Prod u cts for Easier Co m m u n i cat i o n .”

GR25LTDST-English copy 6/21/99 12:00 PM Page 37

Our Thanks to You

Thank you for purchasing the Cobra GR 25 LTD ST
CB Radio.Properly used,this Cobra product will
give you many years of reliable service.

SoundTracker

“Cuts noise coming in...strengthens signals
going out.”

This patent-pending technology dramatically
improves transmission and reception of CB
signals.

The revolutionary SoundTrackerTMSystem recon­figures the transmission signal,allowing it to be
transferred more efficiently through cluttered air­waves.

TM

Cobra on the World Wide Web:
Frequently Asked Questions
(FAQ) can be found on-line at:
www.cobraelec.com

At the same time,it significantly reduces the
amount of static on all incoming CB signals.

The end result is a cleaner,clearer reception of
signals and a more powerful transmission,which
dramatically improve CB communications.

A3

GR25LTDST-English copy 6/21/99 12:00 PM Page 38

Controls and Indicators

1. 6 - Pin Mi c ro p h o n eCo n n e cto r

2. Power On/Off/Volume

3. Squelch

4. Tone Control

5. RF Gain

6. Band Selector

7. Channel Selector

8. LED Channel Display
9 Sound Tracker™ LED
1 0 . RX (Receive)/ TX (Transmit)

LED Indicator

11 . Sound Tracker™ On/Off
12 . Channel 19/Channel 9/

Normal Switch

13 . Dimmer Switch
1 4 . CB/PA Switch
1 5 . NB/ANL ANL/Off Switch
1 6 . Signal Strength Meter
1 7 . Microphone

1 6

1

1 7

1 2

1 5

1 31 4

1 0

2 4 536

1 1

Our Thanks to You

Thank you for purchasing the Cobra GR 25 LTD ST
CB Radio.Properly used,this Cobra product will
give you many years of reliable service.

SoundTracker

TM

“Cuts noise coming in...strengthens signals
going out.”

This patent-pending technology dramatically
improves transmission and reception of CB
signals.

The revolutionary SoundTrackerTMSystem recon­figures the transmission signal,allowing it to be
transferred more efficiently through cluttered air­waves.

9

8

At the same time,it significantly reduces the
amount of static on all incoming CB signals.

The end result is a cleaner, clearer reception of
signals and a more powerful transmission,which

7

dramatically improve CB communications.

Cobra on the World Wide Web:
Frequently Asked Questions
(FAQ) can be found on-line at:
www.cobraelec.com

Rear Panel

1 8 . Public Address Speaker Jack
1 9 . External Speaker Jack
2 0 . Antenna Connector
2 1. Power Jack

A2

1 8 1 9

2 0 2 1

A3

GR25LTDST-English copy 6/21/99 11:59 AM Page 1

How to Use Your

Contents
Section A (English)

Features...........................................................................................1

Included Accessories.................................................................A1

Controls & Indicators................................................................A2

Our Thanks toYou......................................................................A3

SoundTracker

Installation

Location.......................................................................................2

Mounting and Connection...................................................2

Antennas

CB Antenna................................................................................6

Marine Installation...................................................................6

Ignition Noise Interference ...................................................7

Operating Your GR 25 LTD ST

Turning On Your CB.................................................................8

Setting Channel Selector.......................................................9

To Receive...................................................................................10

Selecting a Channel................................................................10

Selecting a Channel from Microphone............................11

S-Meter.........................................................................................11

SoundTracker™System.........................................................12

Activating SoundTracker™..................................................13

NB,Off (Noise Blanker) Switch.............................................14

Bright/Mid/Dim Switch..........................................................15

RF Gain Control.........................................................................15

Setting Squelch.........................................................................16

ToTransmit.................................................................................18

Setting Tone Control...............................................................19

Transmit.......................................................................................20

RF Meter......................................................................................20

External Speaker.......................................................................21

PA (Public Address)..................................................................22

Temporary Mobile Set-Up.....................................................24

Home And Office Set-Up.......................................................25

How Your CB Can Serve You...................................................26

A Few Rules You Should Know............................................26

Local Laws or Regulations....................................................27

CB 10 Codes...............................................................................28

Frequency Ranges......................................................................30

GR 25 LTD ST Specifications..................................................31

Optional Accessories.................................................................32

Deutsch................................................................................Abschnitt B

Español.....................................................................................Sección C

Français....................................................................................Section D

Italiano.....................................................................................Sezione E

™

Cobra GR 25 LTD ST

Features of This Product

• 40 German FM Channels
40 European (CEPT) Channels
12 German AM Channels

• SoundTracker™System

• Heavy-Duty Dynamic
Mi c rophone with Channel Ch a n g e r

• Full 4 Watts RF Power Ou t p u t

• Instant Channel 19 and 9

• Front Panel 6-Pin Microphone
Connector

• Switchable Noise Blanker­Automatic Noise Limiter

• RF Gain

• PA Function

• 2.75-metre (9-foot) Microphone
Cord

1

GR25LTDST-English copy 6/21/99 11:59 AM Page 2

InstallationInstallation

Location

Mounting and
Connection

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 self­tapping screws and star
washers.The mounting must
be mechanically strong and
conveniently located.

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 under­side of the dash with the microphone bracket
beside it.

Mounting and Connection

1

Hold the radio with the mounting bracket in
the exact desired location.If there is no inter­ference,remove the bracket and use it as a
template to mark the location for the mount­ing screws.

cb transceiver

3

Connect the antenna cable plug to the recep­tacle marked “ANT” on the back of the unit.

2

Drill the holes and secure the bracket.

continued

32

GR25LTDST-English copy 6/21/99 11:59 AM Page 4

Note
Before installing the CB radio,

visually check the vehicle’s
battery connection to deter­mine which terminal,positive
or negative,is earthed to the
engine block (or chassis). A
negatively earthed vehicle
has its negative lead earthed
to the chassis.

Note

Connecting to a fuse circuit
controlled by the ignition switch
prevents the unit from being left
on accidentally,and also
permits operating the unit
without running the engine.

Note

In positive earth vehicles the red
wire goes to the chassis and the
black wire is connected to the
ignition switch.

4

In a negative earthed vehicle,connect the red
lead of the DC power cord to an accessory 12
volt fuse.

5

Connect the black lead to the negative side of
the vehicle.This is usually the chassis.Any con­venient location with a good electrical contact
(remove paint) may be used.

6

Plug power cable into back of unit marked
“Power”. Be sure to observe polarity markings.

7

Mount the microphone
bracket on the right side
of the unit (nearer the
driver) using two screws
supplied.Bracket should
be placed under the dash
so that microphone is
readily accessible.

InstallationInstallation

8

Attach the 6-pin microphone cable to recepta­cle on front of unit and Install unit in bracket
securely.

54

GR25LTDST-English copy 6/21/99 11:59 AM Page 6

Ignition Noise InterferenceAntennas

CB Antenna

Note

For optimum performance in
passenger cars the ideal
antenna location is on the
centre of the roof.Second
choice is on the centre of the
boot.

Note

Antenna bracket must be
earthed to the chassis of the
vehicle.

CB Antenna

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.

1

A standard antenna connector is provided
on the transceiver for easy connection.

Marine Installation

The transceiver will not operate at maximum effi­ciency in a boat without an earthing plate,(unless
it has a steel hull). Before attempting installation ,
consult your dealer for information regarding an
adequate earthing system and prevention of
electrolysis between fittings in the hull and water.

Use of a mobile receiver at low signal levels is
normally limited by the presence of electrical
noise.The primary source of noise in cars is from
the alternator and the ignition system.Typically,
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
the vehicle’s engine turned off.The unit requires
very little current and therefore will not signifi­cantly discharge the vehicle’s battery.

Even though the Cobra GR 25 LTD ST has an auto­matic 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.

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