Cobra 25 LTD ST Manuel utilisateur

Installation

Location

Mounting and

Connection

Mounting and Connection

Hold the radio with the mounting bracket in

the exact desired location. f 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 interfere with the driver or passenger.

The transceiver is usually mounted to the under-

side of the dash with the microphone bracket

beside it.

Not

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.

Drill the holes and secure the bracket.

Connect the antenna cable plug to the recep-

tacle marked “ANT” on the back of the unit.

Not

B for installing th CB radio,

visually ch ck th v hicl ’s bat-

t ry conn ction to d t rmin

which t rminal, positiv or

n gativ , is ground d (positiv

is th larg r of th two) to th

ngin block (or chassis). A

n gativ ly ground d v hicl

has its n gativ l ad ground d

to th chassis.

Not

In positive ground vehicles the

red wire goes to the chassis and

the black wire is connected to

the ignition switch.

Installation

Not

Connecting to an accessory fuse

prevents the unit from being left

on accidentally, and also per-

mits operating the unit without

running the engine.

Not

In positive ground vehicles the

red wire goes to the chassis and

the black wire is connected to

the ignition switch.

n 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.

Plug 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.

8Attach the 4-pin microphone cable to

receptacle on the front of the unit and

install unit in bracket securely.

The CB/PA button should be in the

CB position.

OperationOperation

Turning On Setting Channel

Selector

Turning On

Make sure the power cord, antenna and micro-

phone are connected to their proper connectors

before starting.

Setting Channel Selector

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

Rotate the On/Off Volume knob clockwise

the green RT/TX LED and channel display will

be illuminated.

OperationOperation

S-Meter

Swings proportionately to strength of incoming

signal when receiving.

Switch to NORMAL to select desired channel.

Selecting A

Channel

Selecting A Channel

Not

Switch to 9 (Emergency) for

instant access to these channel.

To Receive

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.

Operation

NB, OFF

(Noise Blanker)

Switch

RF Gain Control

Bright/Dim

Switch

RF Gain Control

The RF Gain is used to optimize reception in

strong or weak signal areas.

Bright/Dim Switch

Not

The RF Gain is used to optimize

reception in weak signal areas.

Turn counterclockwise to reduce

gain.

Not

The RF noise blanker is very

effective in reducing repetitive

noises such as ignition interfer-

ence.

Switch to BRT or D M to control brightness

of the channel indicator and multi-function

meter for day or nighttime driving.

Rotate the RF Gain knob counterclockwise

to reduce gain in strong signal areas. n weak

signal areas turn clockwise to increase gain.

B, OFF ( oise Blanker) Switch

Full clockwise rotation closes the gate

allowing only very strong signals to enter.

Full counterclockwise rotation opens the

“gate” allowing all signals in.

To achieve the Desired Squelch Setting (DSS),

turn the Squelch control counterclockwise

until you hear noise. Now turn the control

clockwise just until the noise stops. This is the

DSS setting.

Setting Squelch

Squelch is the “control gate” for incoming signals.

Operation Operation

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 

OPEN

NOISE

WEAK SIGNALS

MEDIUM SIGNALS

STRONG SIGNALS



NOISE

WEAK SIGNALS

MEDIUM SIGNALS

STRONG SIGNALS

G AT E

Gat op n

Gat s t to D sir d

Squ lch S tting (DSS)

Gat clos d

Setting Squelch

Setting Dynamike®

This controls the microphone sensitivity

(outgoing audio level).

To Transmit

Setting

Dynamike®

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.

Be sure to read the F.C.C. Rules

and Regulations included with

this unit before transmitting.

Operation Operation

Select desired channel.

nitially, set fully clockwise so that maxi-

mum voice volume is available. Dynamike®

may have to be reduced in some conditions.

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.

PUSH &

HOLD

Transmit

RF Meter

This meter swings proportionately to the RF

output (outgoing signal) while transmitting.

Operation

PA (Public

Address)

PA (Public Address)

Connect an external PA speaker to the PA jack

on the rear panel.

Not

Speaker should have 8-ohm

impedance and be rated to

handle at least 4.0 watts.

Not

The speaker should be directed

away from the microphone to

prevent acoustic feedback.

Not

When the volume control is

rotated clockwise, activity on

the CB channel will be heard

through the PA speaker.

Set CB/ANL PA switch to PA position.

External Speaker

The external Speaker jack is used for remote

receiver monitoring.

Not

The external speaker should

have 8-ohm impedance and be

rated to handle at least 4.0

watts. When the external speak-

er is plugged in, the internal

speaker is automatically discon-

nected.

Not

Cobra external speakers are

rated at 10 watts. Connect an external speaker to the external

speaker jack on the rear panel.

Temporary Mobile Set-Up

Operation

Temporary

Mobile Set-Up

Temporary Mobile Operation

For temporary mobile operation 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

transceiver for temporary use.

A L (Automatic oise Limiter) Switch

When switched to CB/ANL the Automatic

Noise Limiter is activated. This helps reduce

noise created by the vehicle’s electronics.

Push and hold microphone button and speak

in a normal voice. Your voice will sound on the

PA speaker.

Adjust PA speaker volume with the

Dynamike control.

PUSH &

HOLD

Home And Office Set-Up

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.

Home And Office Set-Up

Warning!

Do not attempt to operate this

transceiver by connecting it

directly to 120 vac.

Connect properly installed and matched base

station antenna.

Simply connect the red (+) and black (-)

leads of the transceiver to the corresponding

terminals of the power pack.

Plug power cable into back of unit marked

“Power”. Be sure to observe polarity markings.

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