Cobra 2010wx Base Cb Tranciever Manual

							9
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 
Section IV Operation (Continued)
INDICATOR FUNCTIONS
1. MODULATION METER. Indicates the percent modulation (AM only).
NOTE
The SWR/SWR CAL/MOD switch must be in the
MOD position to read modulation.
2. SWR METER. Measures the ratio of standing wave voltage of the antenna system.
Used to properly adjust the length of the antenna, and to monitor the quality of
the coaxial cable and all RF electrical connections. If there is any degradation
whatsoever in any of the above, due to humdidity, salt spray, vibration or
corrosion, the SWR meter reading will rise, therby indicating that a problem exists.
To calibrate, switch to the CAL position. Transmit by pressing the mic switch (AM
mode), and adjust the SWR/CAL control to the CAL mark on the meter. Then
switch to SWR position for the SWR measurement.
3. S/RF METER. Indicates relative output power and incoming signal strength.
4. CHANNEL INDICATOR. The selected channel appears on the LCD left of the
channel selector knob.
5. RECEIVE INDICATOR (RX). Appears in LCD.
6. TRANSMIT INDICATOR (TX). Appears in LCD.
7. MODE INDICATOR (USB/LSB/AM). Mode appears in LCD when set by mode
selector.
8. ANTENNA WARNING INDICATOR. Appears on the lower left corner of the LCD
if there is a serious degradation of the antenna system SWR due to humidity, salt
spray, vibration or corrosion.
1234567
8 
						

							10
OPERATING PROCEDURE TO RECEIVE
1. Place the WX/CB Switch in the CB position.
2. Turn the set ON by pressing the POWER Switch.
3. Adjust the VOLUME for a comfortable listening level.
4. Set the Channel selector switch to the desired channel.
5. Set RF GAIN fully clockwise.
6. Set the Mode Selector to desired mode for LSB, AM or USB.
7. Adjust the VOICE LOCK control to clarify the SSB signals or to optimize AM
signals.
8. Listen to the background noise from the speaker. Turn the SQUELCH control
slowly clockwise, until the noise JUST disappears. (No signal should now be
present.) Leave the control at this setting. The SQUELCH is now properly adjusted.
The receiver will remain quiet until a signal is actually received. Do not advance
the control too far, or some of the weaker signals will not be heard.
      Section IV Operation (Continued)
OPERATING PROCEDURE TO TRANSMIT
1. Select the desired channel of transmission.
2. Set the DYNAMIKE control fully clockwise.
3. If the channel is clear, press the push-to-talk switch on the microphone and speak
in a normal voice.
The S-RF meter will indicate relative power output and the modulation meter will
indicate percentage of modulation as you speak into the microphone.
CAUTION
Be sure the antenna is properly connected to the radio before transmitting.
Prolonged transmitting without an antenna or a poorly matched antenna
could cause damage to the transmitter.
OPERATING PROCEDURE TO RECEIVE WEATHER BAND
1. Place WX/CB Switch in the WX position.
2. Turn the Weather Channel Selector (1-7) until you find the Weather
Channel with the clearest reception. Sometimes more than one channel
can be received depending on your location in the broadcast area; how-
ever, the closest broadcast to you will be the one with the clearest signal
(the least static or background noise). 
						

							OPERATING PROCEDURE TO RECEIVE WEATHER BAND continued
3. 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
WX/CB Switch is in the CB mode or the unit is turned off (see NOTE below).
This enables you to monitor CB frequencies and still be warned by the
National Weather Service Emergency Alert. When you hear the alert, place
the WX/CB 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 WX/CB 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.
FREQUENCY COUNTER/LCD DIGITAL CLOCK
1. Located on the right side of the LCD is the Counter/Clock Indicator.
2. For proper procedure to set your LCD Clock, there are the following features:
TIME SET: 2 switches (used to set time).
COUNTER/CLOCK: 1 switch (used to select display).
TO SET TIME
1. Press FREQ. CTR./CLOCK Switch to select the clock.
2. HOUR SWITCH: Press this switch to get correct hour setting.
3. MINUTE SWITCH: Press this switch to get correct minutes setting.
NOTE: the 2010 GTL WX uses a 24-hour clock display (no a.m. or p.m. indi-
cated). Example:
Display Reads Time Is:
01:00 1:00 a.m.
12:00 12:00 noon
18:00 6:00 p.m.
24:00 12:00 midnight
FREQ. CTR./CLOCK:
On power up, the display shows
channel number and frequency being
received. Pressing thr FREQ. CTR./
CLOCK button will select the Clock.
Clock mode only is displayed in the
WX (weather) mode. When switching
out of WX mode, the display will
continue to show the clock until the
FREQ. CTR./CLOCK button is pressed
again.
      Section IV Operation (Continued)
Cobra®2010 GTL WX
R X                                                            L S B
:
HOUR
MIN
FREQ. CTR.
CLOCK
Display in RX mode with Clock showing.11 
						

							12
RECEIVING SSB SIGNALS
There are three types of signals presently used for communications in the Citizens
Band: AM, USB, and LSB. When the MODE switch on your unit is placed in the AM
position, only standard double-sideband, full carrier signals will be detected. An SSB
signal may be recognized while in the AM mode by its characteristic ÒDonald DuckÓ
sound and the inability of the AM detector to produce an intelligible output. The USB
and LSB modes will detect upper sideband and lower sideband respectively, and
standard AM signals.
      Section IV Operation (Continued)
SSB reception differs from standard AM reception in that SSB receiver does not require
a carrier or opposite sideband to produce an intelligible signal. A single-sideband
transmitted signal consists only of the upper or the lower sideband and no carrier is
transmitted. The elimination of the carrier from the AM signal helps to eliminate the
biggest cause of whistles and tones heard on channels which make even moderately
strong AM signals unreadable. Also, SSB takes only half of an AM channel, therefore two
SSB conversations will fit into each channel, expanding the 40 AM channels to 80 SSB
channels. The reduction in channel space required also helps in the receiver because
only 
half of the noise and interference can be received with 100% of the SSB signal.
An SSB signal may be received only when the listening  receiver is functioning in the
same mode. In other words, an upper sideband signal (USB) may be made intelligible
only if the receiver is functioning in the USB position.
If a lower sideband (LSB) signal is heard when the receiver is in the USB  mode, no
amount  of tuning will make the signal intelligible. The reason for this may be
understood if you consider that  when the modulation is applied to the transmitterÕs
microphone in the USB mode, the transmitterÕs output frequency is increased whereas
in the LSB mode the transmitterÕs output frequency is decreased. The result in listening
to the receiver is that when the MODE switch is in the proper position (either USB or
LSB), a true reproduction of single tone of modulation will result, and if the tone is
increased in frequency (such as a low-pitched whistle or a high-pitched whistle) you
will hear the increase in the output tone of the receiver. If the incorrect mode is selected,
an increase in tone of a whistle applied to the transmitter will cause a decrease in the
resultant tone from the receiver.
Thus when a voice is used in place of a whistle or tone, in the proper listening mode
the voice will be received correctly whereas in the incorrect mode, the voice will be
translated backwards and cannot be made intelligible by the voice lock control. When
listening to an AM transmission, a correct sideband is heard in either mode since both
upper and lower sideband are received. 
						

							RECEIVING SSB SIGNALS continued
Once the desired SSB mode has been selected, frequency adjustment may be necessary
in order to make the incoming signal intelligible, the VOICE LOCK control allows the
operator to vary frequency above and below the exact-center frequency of the received
signal. If the sound of the incoming signal is high or low pitched, adjust the operation
of the VOICE LOCK. Consider it as performing the same function as a phonograph
speed control. When the speed is set too high, voices will be high-pitched and if set
too low, voices will be low-pitched. Also, there is only 
one correct speed that will make
a particular record produce the same sound that was recorded. If the record is played
on a turntable that rotates in the wrong direction (opposite sideband) no amount of
speed control (VOICE LOCK) will produce an intelligible sound.
An AM signal received while listening in one of the SSB modes will produce a steady
tone (carrier) in addition to the intelligence, unless the SSB receiver is tuned to exactly
the same frequency by the VOICE LOCK control. For simplicity it is recommended that
the AM modes be used to listen to AM signals.
13
      Section IV Operation (Continued) 
						

							14
 Section V Maintenance and Adjustment
The COBRA 2010 GTL WX transceiver is specifically designed for the environment
encountered in base station installations. The use of all solid state circuitry and its light
weight result in high reliability. Should a failure occur, however, replace parts  only
with identical parts. Do not substitute. Refer to the schematic diagram and parts list.
     NOTE
If the performance described in the OPERATION and MAINTENANCE
AND ADJUSTMENT sections is not obtained, review the operating instru-
ctions to insure that proper procedures were followed. If a problem still
exists, refer to WARRANTY SERVICE INSTRUCTIONS elsewhere in
this manual.
           FCC WARNING
All transmitter adjustments other than those provided on front panel
by the manufacturer must be made by or under the supervision of the
holder of an FCC-issued general radio-telephone operatorÕs license. 
						

							15
10-37 Wrecker needed at
10-38 Ambulance needed at
10-39 Your message delivered
10-41 Please turn to channel
10-42 Traffic accident at
10-43 Traffic Tie up at
10-44 I have a message for you
10-45 All units within range
please report
10-50 Break channel
10-60 What is the next message
number?
10-62 Unable to copy, use
phone
10-63 Net directed to
10-64 Net clear
10-65 Awaiting your next
message/assignment
10-67 All units comply
10-70 Fire at
10-71 Proceed with transmission
in sequence
10-77 Negative contact
10-81 Reserve hotel room for
10-82 Reserve room for
10-84 My telephone number is
10-85 My address is
10-91 Talk closer to mike
10-93 Check my frequency on
this channel
10-94 Please give me a long
count
10-99 Mission completed, all
units secure
10-200 Police needed at
Section VI Appendix
Citizens Band operators have largely adopted the Ò10-codeÓ for standard questions and
answers. Its use permits faster communications and better understanding in noisy
areas. The following table lists some of the more common codes and their meanings.
   10 CODE
  Code   Meaning Code Meaning
10-1 Receiving poorly
10-2 Receiving well
10-3 Stop transmitting
10-4 OK, message received
10-5 Relay message
10-6 Busy, stand by
10-7 Out of service, leaving air
10-8 In service, subject to call
10-9 Repeat message
10-10 Transmission completed,
standing by
10-11 Talking too rapidly
10-12 Visitors present
10-13 Advise Weather/Road conditions
10-16 Make pick up at
10-17 Urgent business
10-18 Anything for us?
10-19 Nothing for you, return to base
10-20 My location is
10-21 Call by telephone
10-22 Report in person to
10-23 Stand by
10-24 Completed last assignment
10-25 Can you contact
10-26 Disregard last information
10-27 I am moving to channel
10-28 Identify your station
10-29 Time is up for contact
10-30 Does not conform to FCC rules
10-32 I will give you a radio check
10-33 EMERGENCY TRAFFIC
10-34 Trouble at this station
10-35 Confidential information
10-36 Correct time is 
						

							16
      Section VI Appendix  (Continued)
A FEW RULES THAT SHOULD BE OBEYED
1. You are not allowed to carry on a conversation with another station for more than
five minutes at a time without taking a one-minute break, to give others a chance
to use the channel.
2. You are not allowed to blast others off the air by over-powering them with
illegally amplified transmitter power, or illegally high antennas.
3. You canÕt use the CB to promote illegal activities.
4. You are not allowed to use profanity.
5. You may not play music in your CB.
6. You may not use your CB to sell merchandise or professional service.
HOW YOUR CB CAN SERVE YOU
¥Warn of traffic tie ups ahead.
¥Provide weather and road information.
¥Provide help fast in event of emergency or breakdown.
¥Suggest good spots to eat and sleep.
¥Make long trips more interesting, and help keep you awake.
¥Provide direct contact with your office or home.
¥Make friends for you as you travel.
¥Provide Òlocal informationÓ to find you destination.
¥Help law enforcement officers by reporting drunk and reckless drivers.
Colonel Samuel S. Smith of the Missouri Highway Patrol called the number of drunken
drivers, wrong-way drivers and speeders reported by CBers as Òamazing.Ó He said,
that even the ÒSmokey BearÓ warnings donÕt shake their beliefs that Òthe potential
benefits of CB radio to law enforcement are so great that they far outweigh the
disadvantages.Ó In regards to CB radar warnings to other CBers, Colonel Smith said
cheerfully that ÒWeÕve overheard warnings being relayed to truckers long after our
operations have been discontinued...so we actually receive a residual benefit from
these warnings.Ó 
						

							Section VI Appendix  (Continued)
17
        USE CHANNEL 9 FOR EMERGENCY MESSAGES ONLY
FCC gives the following examples of permitted and prohibited types of communica-
tions for use on Channel 9. These are guidelines and are not intended to be all-
inclusive.
Permitted Example Message
Yes ÓA tornado sighted six miles north of town.Ó
No ÓThis is observation post number 10. No tornado sighted.Ó
Yes ÓI am out of gas on Interstate 95.Ó
No ÓI am out of gas in my driveway.Ó
Yes There is a four-car collision at Exit 10 on the Beltway, send
police and ambulance.Ó
No ÓTraffic is moving smoothly on the Beltway.Ó
Yes ÓBase to Unit 1, the Weather Bureau has just issued a thunder
storm warning. Bring the sailboat into port.Ó
No ÓAttention all motorists. The Weather Bureau advises that the
snow tomorrow will accumulate 4 to 6 inches.Ó
Yes ÒThere is a fire in the building on the corner of 6th and
Main Streets.Ó
No ÒThis is Halloween patrol unit number 3. Everything is
quiet here.Ò 
						

							      Section IV Operation (Continued)
ALTERNATE MICROPHONES AND INSTALLATION
For best results, the user should select a low-impedance dynamic type microphone
or a transistorized microphone. Transistorized type microphones have a low output
impedance characteristic. The microphones must be provided with a five-lead
cable. The audio conductor and its shielded lead comprise two of the leads. The
third lead is for receive control, the forth is for grounding and fifth is for transmit
control.
The microphone should provide the functions shown in schematic below.
5 WIRE MIC CABLE
Pin Number Mic Cable Lead
1 Audio Lead
2 Audio Shield
3 Receive Control
4 Grounding
5 Transmit Control
   Fig. 1. Cobra 2010 GTL WX microphone schematic.
If the microphone to be used is provided with pre-cut leads, they must be revised
as follows.
1. Cut leads so that they extend 7/16Ó beyond the plastic insulating jacket of the
microphone cable (see Fig. 2.)
2. All leads should be cut to the same length. Strip the ends of each wire 1/8Ó
and tin the exposed wire.
Before beginning the actual wiring, read carefully, the circuit and wiring informa-
tion provided with the microphone you select. Use the minimum lead required in
soldering the connections. Keep the exposed wire lengths to a minimum to avoid
shorting when the microphone plug is reassembled.
Section VI Appendix  (Continued)
18