Cobra 2010wx Base Cb Tranciever Manual

							40 CHANNEL
SOLID STATE CITIZENS BAND
SSB/AM TWO-WAY  RADIO
BASE STATION
With Seven Weather Channels and
NOAA Emergency Alert Tone
OPERATING INSTRUCTIONS FOR YOUR
Model 2010 GTL WX 
						

							How To  Use Your
SOLID STATE CITIZENS BAND
SSB/AM 2-WAY RADIO BASE STATION
Model 2010 GTL WX
Contents     Page
The CB Story ....................................................................................1
Section I: Introduction .....................................................................2
Section II: Specifications .............................................................3, 4
Section III: Installation ....................................................................5
Section IV: Operation ...............................................................6 - 17
Control Functions ................................................................. 6, 7, 8
Indicator Functions ....................................................................... 9
Operating Procedure to Receive ................................................. 10
Operating Procedure to Transmit ................................................ 10
Operating Procedure to Receive Weather Band .................... 10, 11
Frequency Counter/LCD Digital Clock ........................................ 11
Receiving SSB Signals ........................................................... 13, 13
Section V: Maintenance and Adjustment .......................................14
FCC Warning .............................................................................. 14
Section VI: Appendix .........................................................15, 16, 17
Ten Code .................................................................................... 15
A Few Rules That Should Be Obeyed ......................................... 16
How Your CB Can Serve You ..................................................... 16
Use Channel 9 for Emergency Messages Only ............................ 17
Alternate Microphones and Installation .......................... 18, 19, 20
Warranty Service Instructions ..................................................... 21
Limited One Year Warranty ........................................................ 22
Cobra CB Radio Accessories ..................................Inside Back Cover
Cobra
® 
						

							The Citizens Band lies between the shortwave broadcast and 10-meter Amateur radio
bands, and was established by law in 1949. The Class D two-way communications
service was opened in 1959. (CB also includes a Class A citizens band and Class C
remote control frequencies.)
FCC regulations permit only ÒtransmissionsÓ (one party to another) rather than
ÒbroadcastsÓ (to a wide audience). Thus, advertising is not allowed on CB Channels
because that is Òbroadcasting.Ó
The CB Story
1
Replacement or substitution of transistors, regular diodes or other parts of
a unique nature, with parts other than those recommended by Cobra
Electronics, may cause violation of the technical regulations of Part 95 of
the FCC Rules, or violation of Type Acceptance requirements of Part 2 of the
Rules.
Citizens Band (CB) Radio operators are no longer required to obtain an FCC
license to operate their CB equipment  or provide station identification.
Nevertheless, an operator of a CB radio station is still required to comply
with the communications act and with the rules of CB Radio Operation.
What Is Weather Radio?
NOAA WEATHER RADIO (NWR) is a service of the National Oceanic and Atmo-
spheric Administration (NOAA), of the U.S. Department of Commerce. It provides
continuous, around-the-clock broadcasts of the latest weather information directly
from National Weather Service Offices. The broadcasts are tailored to the weather-
information needs of people within the receiving area. For example, coastal and Great
Lakes stations provide specialized weather information for area boaters, fishermen
and others engaged in marine activities, as well as general weather information for the
public-at-large. Three hundred eighty (380) NWR stations are in operation by the U.S.
Government in addition to several NWR stations that are maintained by private interest
groups.
Under a January 1975 White House policy statement, NOAA Weather Radio was
designated as the sole Government operated radio system to provide direct warnings
into private homes for both natural disasters and nuclear attack. The capability is to
supplement warnings by sirens and by commercial radio and television.
NWR Frequencies and Transmission Characteristics
NWR broadcasts have been allocated seven frequencies within the VHF radio
spectrum reserved for Government use. Assigned frequencies are:
162.400 MHz 162.475 MHz 162.525 MHz
162.425 MHz 162.500 MHz 162.550 MHz
162.450 MHz 
						

							Section I Introduction
FREQUENCY RANGE
The COBRA 2010 GTL WX transceiver represents one of the most advanced AM
base station radios used as a Class D station in the Citizens Radio Service. This
unit features advanced Phase Lock Loop (PLL) circuitry providing complete
coverage of all 40 channels as shown below.
CB Channel Freq.  CB Channel Freq.
Channel in MHz Channel in MHz
1 26.965
2 26.975
3 26.985
4 27.005
5 27.015
6 27.025
7 27.035
8 27.055
9 27.065
10 27.075
11 27.085
12 27.105
13 27.115
14 27.125
15 27.135
16 27.155
17 27.165
18 27.175
19 27.185
20 27.205
The COBRA 2010 GTL WX has a vastly superior receiver which includes noise
blanker circuitry and a switchable automatic noise limiter. The receiver also features
increased protection against cross modulation and strong adjacent
channel signals.
To obtain maximum performance please read carefully the descriptions and
operating instructions in this manual. Fill out below;keep for your records.
21 27.215
22 27.225
23 27.255
24 27.235
25 27.245
26 27.265
27 27.275
28 27.285
29 27.295
30 27.305
31 27.315
32 27.325
33 27.335
34 27.345
35 27.355
36 27.365
37 27.375
38 27.385
39 27.395
40 27.405
Weather Weather Freq.
Channel in MHz
1 162.550
2 162.400
3 162.475
4 162.425
5 162.450
6 162.500
7 162.525
Serial No.
Date of Purchase
Dealer Name
Keep this manual for detailed information about your Cobra CB radio.
SAVE YOUR SALES RECEIPT, CARTON AND PACKING FOR POSSIBLE
FUTURE  USE.
2 
						

							       Section II Specifications
GENERAL
Channels 40.
Frequency Range 26.965 to 27.405 MHz.
Frequency Control Phase Lock Loop (PLL) synthesizer.
Frequency Tolerance±130 Hz Typical.
Operating Temperature Range -30° C to + 50° C.
Microphone Plug-in type; 600W dynamic.
Power Source 120V AC nominal.
13.8V DC nominal.
(Positive or negative ground).
Power Consumption
Transmit: AM full mod., 65 watts.
SSB 70 watts.
Receive: Squelched, 30 watts.
Full audio, 40 watts.
Current Drain (13.8V DC)
Transmit: AM and SSB, 2.2A DC (nominal).
Receive: Full audio output, 1.1A DC
Size 5Ó(H) x 15Ó(W) x 4 7/16Ó(D).
Weight 19 
1/2 lbs. (Including speaker).
Antenna Conductor UHF, S0239.
Semiconductors 12 integrated circuits, 3 FETs,
58 transistors, 79 diodes, 1 LCD.
Meter 1 Illuminated; indicates relative power
output, received signal strength.
Meter 2 Illuminated; indicates standing wave ratio
and level of modulation.
TRANSMITTER
Power Output AM, 4 watts.
SSB, 12 watts, PEP.
Modulation High-and low-level Class B, Amplitude
Modulation.
Intermodulation Distortion SSB: 3rd order, more than -25 dB.
        5th order, more than -35 dB.
SSB Carrier Suppression 55 dB.
Unwanted Sideband 50 dB.
Frequency Response AM and SSB; 300 to 2500 Hz.
Output Impedance 50 ohms, unbalanced
Output Indicators
Meter shows relative RF output power
and SWR. RX/TX USB/LSB AM ANT. icons on
LCD, channel frequency and clock.
3 
						

							Section II Specifications (Cont.)
RECEIVER
Sensitivity SSB: 0.25 
mV for 10dB (S+N)/N at greater
than 1/2-watt of audio output.
AM: 0.5
mV for 10 dB (S+N)/ at greater
than 1/2-watt of audio output.
Selectivity AM: 6dB @ 3 KHz, 50 dB @ 9 KHz.
SSB: 6 dB @ 1.1 KHz, 60 dB @ 2.3 KHz.
Image Rejection More than 65 dB.
IF Frequency AM: 7.8 MHz 1st IF, 455 KHz 2nd IF.
SSB: 7.8 MHz.
Adjacent-Channel Rejection 60 dB AM & 70 dB SSB.
AM and SSB RF Gain Control 40 dB adjustable for optimum signal
reception.
Automatic Gain Control (AGC) Less than 10 dB change in audio output
for inputs from 10 to 100,000 microvolts.
Squelch Adjustable; threshold less than 0.25 mV.
ANL Switchable.
Noise Blanker RF type, effective on AM and SSB.
Voice Lock Range±1.5 KHz.
Audio Output Power 4 watts into 8 ohms.
Frequency Response 300 to 2500 Hz.
Built-in Speaker 8 ohms, round.
External Speaker (Not Supplied) 8 ohms; disables internal speaker
when connected.
CLOCK/COUNTER
Clock 24 hr. time.
Counter Displays transmit and receive frequency.
WEATHER (WX) RECEIVER
Type Single Conversion, Superhet 455Hz IF.
Modulation FM; ± 5 KHz Deviation.
Sensitivity Less than 1mV  for 12dB Sinad.
Frequency Range 162.400 to 162.550 MHz.
Channels 7; 25KHz Spacing.
Frequency Control Crystal.
WX Emergency Warning Phase Lock Loop; 1050Hz.
Audio Output Power 4 watts.
(SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE)
4 
						

							5
Section III Installation
LOCATION
Prior to beginning operation of the transceiver, a basic installation must be prepared.
Installation of the transceiver itself is a rather simple procedure.
In selecting the location for the unit, two basic factors must be considered:
1. Access to a 120V, 60 Hz power source.
2. The location must be convenient for running the antenna lead-in cable if outside
antenna installation is proposed.
BASE STATION ANTENNA
Since the maximum allowable power output of the transmitter is limited by the FCC,
the antenna is the most important factor affecting transmission distance. Only a
properly matched antenna system will allow maximum power transfer from the 50-
ohm transmission line to the radiating element.
The recommended method of antenna tuning is to use the built-in SWR meter to adjust
the antenna tuning for minimum reflected power on channel 21.
The radio may be used with any type of 50-ohm base station antenna. A ground plane
vertical antenna will provide the most uniform horizontal coverage. This type of
antenna is best suited for communication with a mobile unit. For point-to-point
operation where both stations are fixed, a directional beam will usually increase
communicating range since this type of antenna concentrates transmitted energy in
one direction. The beam antenna also allows the receiver to listen in only one
direction thus reducing interfering signals.
Antenna height is an important factor when maximum range is desired. Keep the
antenna clear of surrounding structures or foliage. FCC regulations for base station
antenna height are:
1. Omnidirectional antennas may not be higher than 60 feet above the ground when
using a tower, mast or pole, and no higher than 20 feet above an existing structure.
These are only general regulations applicable to most but not all parts of the nation.
Locations near airports and some military installations are subject to different rules;
therfore, it is best to contact your nearest Federal Communications Commission office
for information regarding your specific area.
MOBILE OPERATION/EMERGENCY POWER OPERATION
It is possible to operate the Cobra 2010 GTL WX from an external 13.8V DC power
supply for emergency conditions or from an automobile battery for mobile operation.
We recommend using a genuine Cobra DC power cord (not supplied). The DC power
cord can be purchased through your local dealer, or direct from Cobra. See CB radio
Accessories on the back page of this manual. 
						

							 Section IV Operation
CONTROLS AND INDICATORS
There are eighteen controls, 2 meters, 1 LCD and 1 jack  on the front panel of your
2010 GTL WX.
A. CONTROL FUNCTIONS
1. POWER SWITCH. Press in to turn on radio. Press in, again, and release to turn off
radio.
2. DYNAMIKE. Adjusts the microphone gain in the transmit  mode. This controls the
gain to the extent that full talk power is available several inches away from the
microphone.
3. VOLUME. Turn clockwise to set the desired listening level.
4. SQUELCH . This control is used to cut off or eliminate receiver background noise
in the absence of an incoming signal. For maximum receiver sensitivity  the control
should be adjusted only to the point where the receiver background noise or
ambient background noise is eliminated. Turn fully counterclockwise then slowly
clockwise until the receiver noise disappears. Any signal to be received must now
be slightly stronger than the average received noise. Further clockwise rotation
will increase the threshold level which a signal must overcome in order to be
heard. Only strong signals will be heard at a maximum clockwise setting.
5. RF GAIN CONTROL. Adjust as required to optimize the signal. This control is
used primarily to optimize reception in strong signal areas. Gain is reduced by
counterclockwise rotation of the control.
SWR  CAL SWR  CALSWRMODCALLSBAMUSB
MINFREQ. CTRCLOCKAM / SSB  BASE  STATION  WITH  WEATHER  ALERT
AM / SSB  BASE  STATION  WITH  WEATHER  ALERT
HOUR
VOICELOCK
MAXMIN
RF GAINDYNAMIKE
POWER
PHONEVOLUME
MICSQUELCH
COARSE
NBSWRCAL 100%
01.52
3MODSIGNAL+30R X
TX
ANTUSB
LSB
AM01
9
810
7
6
5
4
311
12
13
14
15
16
17
18
19
203
2
5
9 34 RF PWR
ANL
TUNING
WX  CH 9
2010  GTL  WX 
6
1
3
2456789
1112
14
15
1610
13
17 
						

							7
Section IV Operation (Continued)
6. SWR CAL CONTROL . In order for you to achieve maximum radiated power and
the longest range, it is important that your antenna be in good condition, properly
adjusted and matched to your transceiver.  The Built-in SWR (standing wave
ratio) meter lets you easily measure your antenna condition. To operate this
function, connect your antenna to the transceiver antenna output connector.
Select a channel near the middle of the band such as 21 or the channel you plan
to use most frequently. Turn the power on, set mode switch to AM, and set the
meter function switch to the CAL position. Press and hold the microphone push-
to-talk button and using the SWR CAL control, adjust the meter to read the CAL
position indicated on the meter face. Then, without releasing the microphone
button, switch the meter function switch to the SWR position and read the SWR
indicated. The lower the figure, the better, with 1 being ideal. Generally
speaking, readings up to 3 are acceptable, but over 3 indicates that you are losing
radiated power and antenna adjustment may be advisable. This feature cannot
be used in Weather Mode.
7. VOICE LOCK FINE/COURSE. Allows variation of the receiver operating fre-
quencies above and below the assigned frequency. Although this control is
intended primarily to tune in SSB signals, it may also be used to optimize AM
signals. This feature cannot be used in the Weather Mode.
8. MODE SWITCH (USB/LSB/AM). This switch selects AM (Amplitutde Modula-
tion), USB (Upper Side Band) or LSB ( Lower Side Band) mode of operation. The
Mode selector switch changes the mode of operation of both the transmitter and
receiver simultaneously. This feature cannot be used in the Weather Mode.
9. CHANNEL SELECTOR. In the CB Mode, this electronic selector selects any one
of the forty Citizens Band channels desired. The selected channel appears on the
LCD readout directly above the Channel Selector knob. In WX Mode, any one
of the 7 Weather Channels will be selected.
10. INSTANT CHANNEL 9 BUTTON. Use to activate Emergency Channel 9 instantly.
11. ANL  SWITCH. In the ANL position, the noise reduction circuits of the Automatic
Noise Limiter are activated.  This feature cannot be used in the Weather Mode.
12. NB SWITCH. When this switch is placed in the NB position the RF noise blanker
is activated. The RF noise blanker is very effective for repetitive impulse noise
such as ignition interference. This feature cannot be used in the Weather Mode.
13. WX/CB SWITCH. Selects the mode of operation. In the CB position, the WX
function is placed in Alert mode and the unit will transmit and receive on the
selected CB frequency. In the WX position, select one of 7 Weather Channels for
continous WX monitoring.
Note: Clock is displayed when in Weather Mode.
14. SWR/SWR CAL/MOD SELECTOR. In the MOD position, the MOD meter is
activated. When in the SWR or SWR CAL positions the SWR meter is activated.
This feature cannot be used in Weather Mode. In USB or LSB mode, the MOD
meter does not operate. 
						

							8
Section IV Operation (Continued)
15. PRESS-TO-TALK MICROPHONE. The receiver and transmitter are controlled by
the press-to-talk switch on the microphone. Press the switch and the transmitter
is activated; release switch to receive. When transmitting, hold the microphone
two inches from the mouth and speak clearly in a normal voice. The radio is
supplied with a low-impedance 500-ohm dynamic desktop microphone. For
installation instructions on other microphones, see ALTERNATE MICROPHONES
AND INSTALLATION.
16. HEAD PHONE JACK. For your individual listening with head phones.
17. EXTERNAL SPEAKER (Optional). The External Speaker Jack is used for remote
receiver monitoring. The external speaker should have 8-ohm impedance and be
rated to handle at least 4.0 watts. When the external speaker is plugged in, the
internal speaker is automatically disconnected.
¥ WX ALERT TONE. If threatening weather is nearby, the National Weather
Service may broadcast a 10 second alert tone. This tone will be heard
through the CB, even if the CB/WX Switch is in the CB mode or the unit
is turned off (see NOTE below). This enables you to monitor CB frequen-
cies and still be warned by the National Weather Service Emergency Alert.
When you hear the Alert, place the CB/WX switch in the WX position. You
will then be able to hear the Weather Warning Broadcast.
NOTE: If you are using the CB mode, remember to change the CB/WX
Switch from CB to WX every so often to make sure you are continually
tuned to the clearest weather band channel in case an alert is broadcast.