Cobra 29 LTD CLASSIC How to Use
How to Use Your
Contents
Features..................................................................................................1
The CB Story.........................................................................................A1
FCC Regulations
FCC Warnings
Included Accessories
Controls & Indicators.......................................................................A2
Our Thanks to You .............................................................................A3
Customer Support
Installation
Location .............................................................................................2
Mounting and Connection .........................................................2
Antennas
CB Antenna.......................................................................................6
Marine Installation .........................................................................6
Ignition Noise Interface .................................................................7
Operating Your 29 LTD Classic
Turning On Your CB........................................................................8
Setting Channel Selector.............................................................9
Calibrate For SWR (Standing Wave Ratio)..............................10
To Receive..........................................................................................13
Selecting a Channel.......................................................................14
S-Meter ...............................................................................................14
NB-ANL/ANL/Off (Noise Blanker/Automatic.........................15
Noise Limiter Switch)
Bright/Dim Switch..........................................................................16
RF Gain Control................................................................................17
Setting Delta-Tune.........................................................................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 LTD Classic Specifications .......................................................33
Warranty Information.....................................................................34
Notes........................................................................................................35
Optional Accessories .......................................................................38
Order Form ...........................................................................................40
If You Think You Need Service...................................Back Cover
Cobra 29 LTD Classic
Features of This Product
• 40 CB Radio Channels
• Heavy-Duty Dynamic
Microphone
• Full 4 Watts AM RF Power Output
• SWR Calibration Meter
• Instant Channel 9
• 4-Pin Microphone Connector
• Delta -Tune
• Switchable Automatic Noise
Limiter & Noise Blanker
• Adjustable Dynamike Boost
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
Installation
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,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 interfere with the driver 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.
2
Drill the holes and secure the bracket.
2
Installation
ANT
PA.SP. EXT.SP.
+POWER –
DATE OF
MFG :JUNE 98
FCC ID:BBO3K229LTD
COBRA
MADE IN CHINA
SERIAL NO.:806135776
PRECISION ENGINEERED PRODUCT OF
COBRA ELECTRONICS CORP. CHICAGO, ILL.60707
Note
Before installing the CB radio,
visually check the vehicle’s
battery connection to determine which terminal, positive
or negative, is grounded (positive is the larger of the two)
to the engine block (or chassis). A negatively grounded
vehicle has its negative lead
grounded to the chassis.
3
Connect the antenna cable plug to the receptacle marked “ANT” on the back of the unit.
continued
Note
In positive ground vehicles the
red wire goes to the chassis and
the black wire is connected to
the ignition switch.
3
Installation
Note
Connecting to an accessory fuse
prevents the unit from being left
on accidentally,and also permits 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.
4
In a negative grounded 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.
4
6
ANT
PA.SP. EXT.SP.
+ POWER–
FCC ID:BBO3K229LTD
COBRA
MADE IN CHINA
SIG 1 3 5 7 9 +30dB
2 3 CAL
RF
SWR
RF
DYNAMIKE
RFGAIN
D
S/RF
SWR
CAL
NB/
ANL
ANL
OFF
C
MIN MAX MIN MAX
SQUELCH
OFF
VOLUME
Plug power cable into back of unit marked
“Power”. Be sure to observe polarity markings.
7
Mount the microphone
bracket on either side of
the unit (driver’s left)
using two screws supplied. Bracket should be
placed under the dash
so microphone is readily
accessible.
Installation
8
Attach the 4-pin microphone cable to
receptacle,on side of unit and install unit on
bracket securely.
5
ANT
PA.SP. EXT.SP.
+ POWER–
DATE OF
MFG :JUNE 98
FCC ID:BBO3K229LTD
COBRA
MADE IN CHINA
SERIAL NO.:806135776
PRECISION ENGINEERED PRODUCT OF
COBRA ELECTRONICS CORP. CHICAGO, ILL.60707
Antennas
CB Antenna
Note
For optimum performance in
passenger cars the ideal antenna 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 grounded to the chassis..
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.Call 773889-3087 for further information.
CB Antenna
Since the maximum allowable power output of
the transmitter is limited by the FCC,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. Consult your Cobra dealer for
further details, or call 773.889.3087 and speak to
a Cobra representative.
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 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
Ignition Noise Interference
Use 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 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 29 LTD Classic 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.
7
Operation
DYNAMIKE
RFGAIN
D
S/RF
SWR
CAL
NB/
ANL
ANL
OFF
CB
PA
B
MIN MAX MIN MAX
SQUELCH
OFF
VOLUME
SIG 1 3 5 7 9 +30dB
2 3 CAL
SWR
RF
RF
DYNAMIKE
RFGAIN
DELTATUNE
S
S/RF
SWR
CAL
NB/
ANL
ANL
OFF
CB
PA
BRT
DIM
CH9
NOR
R
MIN MAX MIN MAX
SQUELCH
OFF
VOLUME
SIG 1 3 5 7 9 +30dB
2 3 CAL
SWR
RF
Turning On
Turning On
Make sure the power cord,antenna and microphone are connected to their proper connectors
before starting.
1
The CB/PA button should be in the
CB position.
2
Rotate the On/Off Volume knob clockwise to
a normal listening level.
8
Operation
RFGAIN
DELTATUNE
SWR CAL
NB/
ANL
ANL
OFF
CB
PA
BRT
DIM
CH9
NOR
RX/TX
Setting Channel Selector
1
Select one of forty channels and adjust
volume.The selected channel is indicated by
the LED readout directly above the channel
selector knob
Setting Channel
Selector
9
RFGAIN
DELTATUNE
SWR CAL
NB/
ANL
ANL
OFF
CB
PA
BRT
DIM
CH9
NOR
RX/TX
Operation
DYNAMIKE
RFGAIN
D
S/RF
SWR
CAL
NB/
ANL
ANL
OFF
CB
PA
B
MIN MAX MIN MAX
SQUELCH
OFF
VOLUME
SIG 1 3 5 7 9 +30dB
2 3 CAL
SWR
RF
Calibrate For
SWR (Standing
Wave Ratio)
Note
Antenna Indicator LED will
illuminate when TX if SWR is
high.
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 optimum performance.
1
Select channel 20.
2
Switch to the CAL position.
10
3
PUSH &
HOLD
RFGAIN
DELTATUNE
SWR CAL
NB/
ANL
ANL
OFF
CB
PA
BRT
DIM
CH9
NOR
RX/TX
SIG 1 3 5 7 9 +30dB
2 3 CALSWR
RF
Push and hold
Operation
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).
mic button.
4
While holding mic
button adjust the
SWR CAL knob so the
meter needle swings
to the CAL ▼ mark on
the meter (located on the right).
continued
11
Operation
DYNAMIKE
RFGAIN
D
S/RF
SWR
CAL
NB/
ANL
ANL
OFF
CB
PA
B
MIN MAX MIN MAX
SQUELCH
OFF
VOLUME
SIG 1 3 5 7 9 +30dB
2 3 CAL
SWR
RF
Note
The reading will be slightly higher on Channels 1 and 40 compared to Channel 20.
Note
When switched to SWR position
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.
5
While still holding down the mic button, set
the S/RF SWR CAL switch to the SWR position,
to read the SWR reading.
6
Repeat the same steps two through five on
Channel 1 and 40.This will check SWR for all
channels.
12
Operation
RF
DYNAMIKE
RFGAIN
DELTATUNE
S
S/RF
SWR
CAL
NB/
ANL
ANL
OFF
CB
PA
BRT
DIM
CH9
NOR
R
MIN MAX MIN MAX
SQUELCH
OFF
VOLUME
SIG 1 3 5 7 9 +30dB
2 3 CAL
SWR
RF
To Receive
1
Rotate the On/Off Volume knob clockwise
the green RT/TX LED will be illuminated.
To Receive
13
Operation
DELTATUNE
SWR CAL
BRT
DIM
CH9
NOR
RX/TX
DYNAMIKE
R
S/RF
SWR
CAL
NB/
ANL
ANL
OFF
C
SQUELCHVOLUME
SIG 1 3 5 7 9 +30dB
2 3 CALSWR
RF
Selecting A
Channel
S-Meter
Selecting A Channel
1
Switch to NOR to select desired channel.
S-Meter
Swings proportionately to strength of incoming
signal when receiving.
1
The S/FR-SWR-CAL switch must be in the
S/RF position to read the meter.
14
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