How to Use Your
Cobra 29 NW ST
Contents
Features..................................................................................................1
Controls & Indicators.......................................................................A1
Installation
Location .............................................................................................2
Mounting and Connection .........................................................2
Antennas
Features of This Product
CB Antenna.......................................................................................6
Marine Installation .........................................................................6
Ignition Noise Interference ..........................................................7
Operating Your 29 NW ST
•
•
•
40 CB Radio Channels
SoundTracker™ System
Turning On Your CB........................................................................8
Setting Channel Selector.............................................................9
Calibrate For SWR (Standing Wave Ratio)..............................10
To Receive..........................................................................................12
Selecting a Channel.......................................................................13
S-Meter ...............................................................................................13
Heavy-Duty Dynamic
Microphone
•
•
•
•
Full 4 Watts AM RF Power Output
SWR Calibration Meter
™
SoundTracker System ................................................................14
™
Activating SoundTracker ..........................................................15
Instant Channel 19 and 9
NB-ANL/ANL/Off (Noise Blanker/Automatic.........................16
Noise Limiter Switch)
Front Panel 4-Pin Microphone
Connector
Tone Hi/Nor.......................................................................................17
RF Gain Control................................................................................17
Dimmer Switch................................................................................18
Setting Squelch ...............................................................................18
To Transmit........................................................................................20
Setting Dynamike...........................................................................20
Transmit..............................................................................................21
RF Meter.............................................................................................22
External Speaker .............................................................................23
PA (Public Address) ........................................................................24
Home And Office Set-Up .............................................................26
Temporary Mobile Set-Up ...........................................................27
How Your CB Can Serve You..........................................................28
A Few Rules You Should Know..................................................28
Channel 9 Emergency Messages..............................................28
CB 10 Codes......................................................................................30
Frequency Ranges.............................................................................32
29 NW ST Specifications.................................................................33
Warranty Information .....................................................................34
Optional Accessories.................................................................35-36
•
•
Delta -Tune
Switchable Automatic Noise
Limiter & Noise Blanker
•
•
Adjustable Dynamike Boost
Tactile Controls
• Illuminated Front Panel
• Dim Control
• RF Gain
• 9 ft. Mic Cord
CAUTION
RISK OF ELECTRIC SHOCK
!
DO NOT OPEN
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
!
1
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Installation
Installation
FCC ID:BBO3K229LTD
ANT
COBRA
PA.SP. EXT.SP.
+POWER–
MADE IN CHINA
CT OF
CAGO, ILL.60707
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.
6
Plug power cable into back of unit marked
“Power”. Be sure to observe polarity markings.
Note
In positive ground vehicles the
red wire goes to the chassis and
the black wire is connected to
the ignition switch.
7
Mount the microphone
bracket on either side of
the unit (driver’s left)
using two screws sup-
plied. Bracket should be
placed under the dash
so microphone is readily
accessible.
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 (or chas-
sis). A negatively grounded
vehicle has its negative lead
grounded to the chassis.
4
5
In a negative grounded vehicle, connect the
red lead of the DC power cord to an accessory
12 volt fuse.
29 NW ST
SWR
2
3
CAL
S/RF
SWR
NB/
ANL
ANL
C
R
RF
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.
SIG 1
3
5
7
9
+30dB
P
CAL
OFF
VOL
SQL
DYNAMIKE
RFGA
OFF
MIN
MAX MIN
8
Attach the 4-pin microphone cable to recepta-
cle on front of unit and Install unit in bracket
securely.
4
5
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Antennas
Ignition Noise Interference
Use of a mobile receiver at low signal levels is
CB Antenna
CB Antenna
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.
Since the maximum allowable 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.
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 ground
strap, if the antenna is mounted
on the mirror bracket.
Even though the Cobra 29 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.
DATE OF
FCC ID:BBO3K229LTD
MFG :JUNE 98
ANT
COBRA
PA.SP. EXT.SP.
+POWER–
MADE IN CHINA
SERIAL NO.:806135776
PRECISION ENGINEERED PRODUCT OF
COBRA ELECTRONICS CORP. CHICAGO, ILL.60707
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.
1
A standard antenna connector is provided
on the transceiver for easy connection.
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.
6
7
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Operation
Operation
Turning On
Setting Channel Selector
Turning On
Setting Channel
Selector
Make sure the power cord, antenna and micro-
phone are connected to their proper connectors
before starting.
29 NW ST
TONE
CH19
NB/
ANL
ANL
CB
HI
RX/TX
CH9
NOR
PA
NOR
OFF
29 NW ST
RFGAIN
DIMMER
SWR CAL
SWR
RF
2
3
CAL
S/RF
SWR
NB/
ANL
ANL
CB
SIG 1
3
5
7
9
+30dB
PA
CAL
OFF
VOL
SQL
DYNAMIKE
RFGAIN
AX MIN
MAX MIN
MAX
1
Select
one of forty channels and adjust
OFF
MIN
MAX MIN
MAX
volume. The selected channel is indicated by
the LED readout directly above the channel
selector knob
1
The CB/PA button should be in the
CB position.
29 NW ST
TONE
S/RF
SWR
NB/
ANL
ANL
CH
CH
CB
HI
9
PA
NOR
CAL
OFF
NO
DIMMER
RFGAIN
VOL
SQL
DYNAMIKE
MIN
M
2
Rotate the On/Off Volume knob
a normal listening level.
clockwise to
8
9
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Operation
Operation
Calibrate for SWR (Standing Wave Ratio)
Calibrate For
SWR (Standing
Wave Ratio)
SWR calibration is done to properly adjust the
length of the antenna and to monitor the quality
of the coaxial cable and all RF connections.
This calibration is critical in order to achieve opti-
mum performance.
PUSH &
HOLD
Note
Calibration must be made in an
open area (never in a garage).
Vehicle doors must be closed. No
one should be standing near the
antenna. (See your antenna
directions for more complete
information).
29 NW ST
TONE
CH19
CH9
NB/
ANL
ANL
CB
HI
RX/TX
PA
NOR
OFF
NOR
E
RFGAIN
DIMMER
SWR CAL
3
Push and hold mic button.
Note
AX MIN
MAX MIN
MAX
29 NW ST
The reading will be slightly high-
er on Channels 1 and 40 com-
pared to Channel 20.
TONE
NB/
ANL
ANL
CH19
CH9
CB
HI
RX/TX
1
Select
channel 20.
PA
NOR
OFF
NOR
E
RFGAIN
DIMMER
SWR CAL
29 NW ST
SWR
RF
2
3
CAL
S/RF
SWR
NB/
CB
ANL
ANL
MAX MIN
MAX
MIN
MAX
SIG 1
3
5
7
9
+30dB
PA
CAL
OFF
VOL
SQL
DYNAMIKE
RFGAIN
4
While holding mic
button adjust the
SWR CAL knob so the
meter needle swings
to the CAL ▼ mark on
SWR
RF
2
3
CAL
OFF
MIN
MAX MIN
MAX
SIG 1
3
5
7 9 +30dB
the meter (located on the right).
2
Switch to the CAL position.
continued
10
11
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Operation
Operation
Selecting A Channel
Selecting A
Channel
29 NW ST
SWR
RF
2
3
CAL
S/RF
SWR
NB/
ANL
ANL
CB
SIG 1
3
5
7
9
+30dB
PA
CAL
OFF
TONE
CH19
B
HI
Note
RFGAIN
VOL
SQL
DYNAMIKE
RX/TX
CH9
NOR
Note
Switch to 9 (Emergency) or 19
(Information) for instant access
to these channels.
A
NOR
When switched to SWR posi-
tion the meter needle should
ideally be as far to the left as
possible. Anything over 3 is
not acceptable. A slight
antenna height adjustment
(higher or lower) may be
required. Repeat relcalibration
steps.
IN
DIMMER
SWR CAL
OFF
MIN
MAX MIN
MAX
MAX MIN
MAX
5
6
While still holding down the mic button, set
the S/RF SWR CAL switch to the SWR position,
to read the SWR reading.
1
Switch to NOR to select desired channel.
Repeat the same steps two through five on
Channel 1 and 40. This will check SWR for all
channels.
S-Meter
S-Meter
Swings proportionately to strength of incoming
signal when receiving.
To Receive
To Receive
29 N
NB/
ANL
ANL
29 NW ST
TONE
S/RF
SWR
NB/
ANL
ANL
CH19
CH9
SWR
RF
2
3
CAL
S/RF
SWR
CB
HI
9
PA
NOR
CAL
OFF
NOR
SIG 1
3
5
7 9 +30dB
VOL
SQL
DYNAMIKE
RFGAIN
DIMMER
OFF
CAL
VOL
SQL
DYNAMIKE
MIN
MA
1
The S/RF-SWR-CAL switch must be in the
S/RF position to read the meter.
1
Rotate the
On/Off Volume knob clockwise
the green RT/TX LED will be illuminated.
12
13
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Operation
Operation
TM
The SoundTracker System
Activating SoundTracker™
Activating
SoundTracker™
While previous systems only “blanket out” or limit
noise in higher sound frequencies, the revolution-
TM
ary new SoundTracker System actually reduces
TONE
Note
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.
HI
RX/TX
SoundTracker™ gives you
clearer, cleaner reception to
improve CB communications
while on the air.
NOR
DIMMER
MIN
MAX
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.
1
Push and release the
is illuminated when SoundTracker™ is
turned on.
ST button. Red LED
TM
How SoundTracker Works
On Reception - “Cuts noise coming in”
With a normal CB, distant signals fall below
the squelch level and are unintelligible. With a
TM
SoundTracker 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”
TM
A SoundTracker 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.
14
15
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Operation
Operation
NB-ANL/ANL/OFF (Noise
Blanker/Automatic Noise Limiter) Switch
Tone Hi/Nor
This switch is used to shape the Audio Response
to the operators preference.
NB-ANL/ANL/
OFF (Noise
Blanker/
Tone Hi/Nor
Automatic
Noise Limiter)
Switch
29 NW ST
SWR
RF
2
3
CAL
S/RF
SWR
NB/
ANL
ANL
CB
TONE
CH19
B
HI
RX/TX
SIG 1
3
5
7
9
+30dB
CH9
NOR
PA
CAL
OFF
A
NOR
RFGAIN
VOL
SQL
DYNAMIKE
IN
DIMMER
SWR CAL
OFF
MIN
MAX MIN
MAX
MAX
MIN
MAX
Note
The RF noise blanker is very
effective in reducing repetitive
noises such as ignition interfer-
ence.
1
When switched to ANL the Automatic Noise
Limiter is activated. This helps reduce noise
created by the vehicle’s electronics.
1
When set in HI the treble is increased.
RF Gain Control
RF Gain Control
When switched to NB/ANL position the RF
Noise Blanker is also activated, providing
increased noise filtration.
The RF Gain is used to optimize reception in
strong or weak signal areas.
When switched to OFF position all noise
filtration will be turned off.
29 NW ST
TONE
CH19
SWR
2
3
CAL
S/RF
SWR
NB/
ANL
ANL
HI
CB
CH9
NOR
SIG 1
3
5
7
9
+30dB
NOR
CAL
OFF
Note
DIMMER
VOL
SQL
DYNAMIKE
RFGAIN
The RF Gain is used to optimize
reception in weak signal areas.
MIN
MA
OFF
MIN
MAX MIN
MAX
1
Rotate the
RF Gain knob counterclockwise
to reduce gain in strong signal areas. In weak
signal areas turn clockwise to increase gain.
16
17
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Operation
Operation
Gate open
Dimmer Switch
Dimmer Switch
29 NW ST
TONE
HI
STRONG SIGNALS
MEDIUM SIGNALS
WEAK SIGNALS
NOISE
NOR
DIMMER
29 NW ST
TONE
Note
HI
R
MIN
MA
The Dimmer controls the
brightness of the front panel,
signal strength meter and
channel display.
DIMMER
DYNAMIKE
RFGAIN
2
Full
counterclockwise rotation opens the
“gate” allowing all signals in.
MIN
MAX
29 NW ST
TONE
HI
1
Rotate the
Dimmer knob clockwise for maxi-
mum brightness; counter-clockwise for minimum.
NOR
DIMMER
Gate set to Desired
Setting Squelch
Squelch is the “control gate” for incoming signals.
Setting Squelch
Squelch Setting (DSS)
MIN
MA
STRONG SIGNALS
MEDIUM SIGNALS
WEAK SIGNALS
NOISE
Gate closed
29 NW ST
TONE
HI
STRONG SIGNALS
3
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.
NOR
DIMMER
MEDIUM SIGNALS
WEAK SIGNALS
NOISE
MIN
M
1
Full
clockwise rotation closes the gate
allowing only very strong signals to enter.
18
19
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Operation
Operation
To Transmit
Transmit
To Transmit
Transmit
29 NW ST
TONE
CH19
NB/
ANL
ANL
Caution!
CB
HI
PUSH &
HOLD
RX/TX
CH9
NOR
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.
PA
NOR
OFF
RFGAIN
DIMMER
SWR CAL
AX MIN
MAX MIN
MAX
1
Select desired
channel.
1
Setting Dynamike
|