Cobra_148nwst Cb Tranciever_manual

How to Use Your 
Cobra 148 NW STContents
Features..................................................................................................1
The CB Story.........................................................................................A1
FCC Regulations
FCC Warnings
Included Accessories
Controls & Indicators.......................................................................A2
Our Thanks to You.............................................................................A3
SoundTracker™...

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...

Installation Installation54Note
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.
Note
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...

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...

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 knob1148 NW ST manual 3.3  6/15/99...

Rotate the       On/Off Volume knob clockwise
the green RT/TX LED will be illuminated.Operation11Operation10
S-MeterTo Receive1
To ReceiveThe     S/RF-SWR-CAL switch must be in the
S/RF position to read the meter.1 S-Meter
Swings proportionately to strength of incoming
signal when receiving.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...

Operation Operation1312
Activating
SoundTracker™Push and releasethe        ST button.Red LED 
is illuminated when SoundTracker™ is 
turned on.1 Activating SoundTracker™NB-ANL/ANL/
OFF (Noise
Blanker/
Automatic
Noise Limiter)
Switch 
Hi/Low/ Tone
ControlHi/Low Tone ControlNote
The RF Noise Bl a n ker is  ve ry
e f fe ct i ve  in reducing re pe t i t i ve
noises such as ignition 
i n te rfe re n ce.
The Automatic Noise Limiter
helps reduce noise created by
the vehicle’s electronics.NB-ANL/ANL/OFF (Noise...

Operation Operation1514
RF Gain ControlRF Gain Control
The RF Gain is used to optimize reception in
strong or weak signal areas.
Dimmer ControlDimmer Control
Controls the brightness of the front panel,signal
strength meter and channel displayNote
The RF Gain is used to optimize
reception in weak signal areas.
Rotatethe       RF Gain knob counterclockwise
to reduce gain in strong signal areas.In weak 
signal areas turnclockwiseto increase gain. For maximum brightness turnclockwise;
counterclockwisefor...

Full      clockwiserotation closes the gate
allowing only very strong signals to enter.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.Setting Squelch 
Squelch is the “control gate” for incoming signals.1716OperationOperation13Gate set to Desired 
Squelch Setting (DSS)
Gate closed
Setting SquelchFull      counterclockwiserotation opens the
“gate”allowing...

While holdingmic 
button adjustthe 
SWR CAL knob so the
meter needle swings
to the CAL tmark on
the meter (located on the right).If optimum
signal is not achieved (less than 3) a slight
adjustment to the length of the antenna must
be made. Recalibrate.
Repeat the same steps on Channel 1 and 40.
Continue holding the mic button and turn the
SWR CAL knob to the SWR position for SWR
measurement.Operation Operation
Calibrate For
SWR (Standing
Wave Ratio)1918Note
Calibration must be made in an
open area (never...