Cobra 148GTL-DX Radio Illegal Bandwidth Without Holding Amateur Instruction Manual

Cobra 148GTL-DX Radio Illegal Bandwidth Without Holding Amateur Instruction Manual

Section Introduction

FREQUENCY RANGE

The COBRA 148GTL-DX transceiver represents one of the most advanced SSB/CW/AM/FM two-way radios ever designed for use as the Citizens Radio Service. This unit features advanced Phase Lock Loop (PLL) circuitry, which is used in the AM/FM mode, in the upper and lower single sideband modes and in the CW mode providing complete coverage of all 120 channels shown below.

The COBRA 148GTL-DX has a vastly superior receiver which includes an RF gain control and noise blanker circuitry effective in both AM/FM and SSB/CW modes, and-an-automatic-noise limiter effective in the AM mode. The receiver also features increased protection against cross modulation and strong adjacent channel signals.

To obtain maximum performance from your transceiver, please read carefully the following descriptions and operating instructions.

Section II Specifications

GENERAL

MHz. Hi Band, 27.415 to 27.855 MHz.
Frequency Control| Phase Lock Loop (PLL) synthesizer.
Frequency Tolerance| 0.005%.
Frequency Stability| 0.001%.
Operating Temperature Range| -30°C to +50°C.
Microphone| Plugdn dynamic; with push-to-talk switch — – – and coiled cord.
Input Voltage| 13.8V DC nominal, 15.9V max., 11.7V min. (positive or negative ground). Transmit: AM full mod., 2.2A. SSB 12 watts PEP output, 2A. Receiver: Squelched, 0.3 A. Maximum audio output, 0.7A.
Size| 2-3/8″(H) x 7-7/8″(W)x 9-1/4″(D).
Weight| 51bs.
Antenna Connector| UHF, S0239.
Meter (3-in-1)| Illuminated; indicates relative output power, received signal strength, and SWR.

TRANSMITTER

capacitance Frequency Modulation: FM.
Intermodulation Distortion| SSB: 3rd order, more than ~25 dB. 5th order, more than -35 dB.
SSB Carrier Suppression| 55dB
Unwanted Sideband| 50dB
Frequency Response| AM and FM: 450 to 2500 Hz.
Output Impedance| 50 ohms, unbalanced.
Output Indicators| Meter shows relative RF output power and SWR. Transmit LED glows red when transmitter is in operation.

RECEIVER

Sensitivity| SSB/CW: 0.25 uV for 10 dB (S+N)/N at greater than %-watt of audio output. AM: 0.5 pV for 10 dB (S+N)/N at greater than %-watt of audio output. FM: 1.0 uV for 20 dB (S+N)/N at greater than %-watt of audio output.
---|---
Selectivity| AM/FM: 6.dB @3 KHz, 50 dB @ KHz. SSB/CW: 6 dB @2.1 KHz, 60 dB @3.3 KHz.
Image Rejection| More than 65 dB.
IF Frequency| AM/FM: 10.695 MHz 1st IF, 455 KHz 2nd IF . SSB/CW: 10.695MHz.
Adjacent-Channel Rejection| 60 dB AM/FM & 70 dB SSB/CW.
AM/FM and SSB/CW/RF Gain Control| 45 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 0.5 uV.
ANL| Switchable.
Noise Blanker| RF type, effective on AM/FM and SSB/CW.
External Speaker (Not Supplied)| 8 ohms; disables internal speaker when con- nected.

Section III Installation

LOCATION

Plan the location of the transceiver and microphone bracket before starting the installation. Select a location that is convenient for operation and does not interfere with the driver or passengers in the vehicle. In automobiles, the transceiver is usually mounted below the dash panel, with the microphone bracket beside it.

MOUNTING THE CONNECTION

The COBRA 148GTL-DX is supplied with a universal mounting bracket.

When mounting the bracket and radio to your car, make sure it is mechanically strong. Also provide a good electrical connection to the chassis of the vehicle. Proceed as follows to mount the transceiver: .

1. After you have determined the most convenient location in your vehicle, hold the COBRA 148GTL-DX with mounting bracket iri the exact location desired. If nothing will interfere with mounting it in the desired position, remove the mounting bolts. Before drilling the holes, make sure nothing will interfere with the installation of the mounting bolts.
2. Connect the antenna cable plug to the standard receptacle on the rear panel. Most CB antennas are terminated with a type PL-259 plug and mate with the receptacle.
3. Connect the red DC power input wire (with the fuse) to +13.8V DC. This wire éxtends from the rear panel. In automobile installation, +13.8V DC is usually obtained from the accessory contact on the ignition switch. This prevents the set being left on accidentally when the driver leaves the car and also permits operating the unit without the engine running. Locate the ac- cessory contact on most ignition switches by tracing the power wire from the AM broadcast receiver in the car.
4. Connect the black lead to ~13.8V DC. This is usually the chassis of the car.n Any convenient location with good electrical contact (remove paint) may be used.
5. Mount the microphone bracket on the right side of the transceiver or near the transceiver, using two screws supplied. When mounting in an automobile, place the bracket under the dash so the microphone is readily accessible.

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 automobile installations is from the generator and ignition system in the vehicle. Under most operating conditions, 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 vehicle engine tummed off. The unit requires very little current and therefore will not significantly discharge the vehicle battery.

Even though the COBRA 148GTL-DX has ANL and NB controls, in some :

installations ignition interference may be high enough to make good communications impossible. The electrical noise may come from several sources. Many possibilities exist and variations between vehicles require different solutions to reduce the noise. Consult your COBRA dealer or a 2-way radio technician for help in locating and correcting the source of severe noise.

ANTENNA N

Since the maximum allowable power output of the transmitter is limited by the FCC, the antenna is one 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. In mobile installations (cars, trucks, boats, etc.), an antenna system that is non-directional should be used.

A vertically polarized, quarter-wavelength whip antenna provides the most reliable operation and greatest range. Shorter, loaded-type whip antennas are more attractive, compact and adequate for applications where: the maximum possible distance is not required. Also, the loaded whips do not present the problems of height imposed by a full quarter-wavelength whip. Mobile whip antennas utilize the metal body of the vehicle as a ground plane.

When mounted at a corner of the vehicle they are slightly directional, in the direction of the body of the vehicle. For all practical purpose, however, the radiation pattern is nondirectional. The slight directional characteristic will be observed only at extreme distances. A standard antenna connector (type SO 239) is provided on the transceiver for easy connection to a standard PL 259 cable termination.

If the transceiver is not mounted on a metal surface, it is necessary to run a separate ground wire from the unit to a good metal electrical ground in the vehicle. When installed in a boat, the transceiver will not operate at maximum efficiency without a ground plate, unless the vessel has a steel hull. Before installing the transceiver in a boat, consult your dealer for information regarding an adequate grounding system and prevention of electrolysis between fittings in the hull and water.

TUNING THE ANTENNA FOR OPTIMUM SWR

Since there is such a wide variety of base and mobile antennas, this section will strictly concern itself to the various types of mobile adjustable antennas.

Because the aritenna length is directly related to. the channel frequency, if must be tuned to resonate optimally all 120 channels of the transceiver. Channel 1 requires a longer antenna than Channel 120 because it is lower in frequency. Due to the various methods of adjusting ante chosen what we think is the optimum method:

A. Antennas with adjustment screws (set screws).

1. Start with the antenna extended and tighten the set screw lightly enough so that the antenna can be lightly tapped with your finger for easy adjustment.
2. Set your COBRA 148GTL-DX to Channel 21 @ Mid band. Press the PTT (push-to-talk) switch, and tap the antenna (making it shorter). The SWR meter will show a lower reading each time the antenna is tapped. By continu- ing to shorten the antenna you will notice the SWR reading will reach a low print and then start rising again. This means that you have passed the opti- mum point for Channel 21. Extend the antenna a short distance and again follow the procedure above. : S
   When the lowest point has been reached, switch to Channel @ Low band and then to Channel 40 @ Hi band and compare SWR readings. They sould be almost equal.

B. Antennas which must be cut to proper length.

1. Follow the same procedure as above, but adjust the length by cutting in 1/8″ increments until a good match is obtained.
2. Be very careful not to cut too much at one time, as one it is cut, it can no longer be lengthed.
3. The whip is easily cut by filing a notch all the way around and breaking the piece off with pliers.

NOTE

THE PROPER SETTING IS ACHIEVED WHEN THE SWR IS 1.5 OR BELOW, AND WHEN IT HAS THE SAME READING FOR CHAN- NELS LOW BAND 1 AND HI BAND 40,

If you are having difficulties in adjusting your antenna, check the following:

• A. All doors must be closed when adjusting the antenna.
• B. Make sure the antenna base is grounded.
• C. Check your coaxial cable routing (it may be pinched when routed into the car).
• D. Try a different location on your car (keeping in mind the radiation pattern you wish).
• E. Is the antenna perfectly vertical?
• F. Try a different location in your neigl1horfiood. Stay away from large metal objects when adjusting (metal telephone or light posts, fences, etc.)

NOTE

The COBRA 148GTL-DX will operate into an SWR of 2 to 1 indefinitely and sustain an SWR of 20:1 for a maximum of 5 minutes at rated operating conditions.

BASE STATION OPERATION

(Operating from 120V AC House Current)

To operate your transceiver from your home or office, using the regular house current as the power source, you will require the DYNASCAN Model CA20 Power- Pak which has been specially designed for the purpose. It is available as optional equipment from your dealer. It consists of a precision-built AC- DCpower converter that delivers the required power for the-operation of the transceiver. The CA-20 operates from any 120-volt, 60 Hz power source. Simply connect the red (+) and black (=) leads of the transceiver to the. corresponding terminals of the CA-20.

NOTE

Do not attempt to operate this transceiver by connecting directly to 120 volts AC.

When the CA-20 Power-Pak is used with the transceiver for base station operation, any Citizens Band beam, dipole, ground plane or vertical antenna may be used. A ground plane vertical antenna will provide the most uniform horizon- – tal coverage.

External Speaker

The external speaker jack (EXT. SPK.) on the rear panel is used for remote receiver monitoring. The external speaker should have 8 ohms impedance and be able to handle at least 4 watts. When the external speaker is plugged in, the internal speaker is disconnected.

CW KEY

This jack is for Morse code operation; To operate, connect a CW Key to this jack and place the CW/FM/AM/USB/LSB switch in the CW position.

Section IV Operation

CONTROLS AND INDICATORS

There are thirteen controls and three indicators on the front panel of your COBRA 148GTL-DX.

A. CONTROL FUNCTIONS

1. MIKE GAIN. (inner dual concentric) Adjusts the microphone gain in the transmit and PA modes. This controls the gain to the extent that full talk power is available several inches away from the microphone.

2. OFF/ON/VOLUME (inner dual concentric). Turn clockwise to apply power to the unit and to set the desired listening level. During normal CB operation, the VOLUME control is used to adjust th output level obtained either at the transceiver speaker or the external speaker, if used.

3. SQUELCH (outer dual concentric). This control is used to cut off or eliminate receiver background noise in the absence of an incoming signal. For maximum receiver sensitivity it is desired that the control be adjusted only to the point where the receiver background noise or ambient background  noise is eliminated. Tum fully counterclockwise then slowly clockwise untilthe 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.

4. RF GAIN CONTROL (outer dual concentric). Used to reduce the gain of the RF amplifier under strong signal conditions.

5. SWR CALCONTROL 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 trans ceiver. 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 nearthe middle pf the band such as 21 or the channel you plan to use most frequently. Turn the power on 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 fifgure, 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.

6. S-RF/SWR/CAL SWITCH. When in the S-RF position, the meter swings proportionally to the strength of the received sigrlal. When transmitting, the meter indicates relative RF output power. When in’the “CAL” position, the SWR meter can be calibrated by adjusting __the “SWR CAL” control to the “CAL” mark on the meter face. When in the “SWR” position, the standing wave ratio is measured.

7. MODE (CW/FM/AM/USB/LSB) SWITCH. This switch is used to select CW, FM, AM, LSB or USB mode of operation. Unless the station with which communication is desired is equipped with SSB, the AM or FM mode is normally used. The mode selector switch changes the mode of operation of both transmitter and receiver simultaneously. Tumn to “Receiving SSB signals” for a further explanation of single sideband.

8. VOICE LOCK. Allows variation of the receiver operating frequencies above and below the assigned frequency. Although this control is intended primarily to tune in SSB/CW signals, it may be used to optimize AM/FM signals as described in the Operating Procedure paragraphs. Coarse operates both TX/RX but Fine only in RX.

9. CHANNEL SELECTOR. This switch selects any one of the forty Citizens
   Band channels desired. The selected channel appears on the LED readout directly above the Channel Selector knob.

10. CHANNEL 9 SWITCH. Channel 9 has been reserved emergency communications involving  the immediate safety of life of individuals or immediate protection of properly. Channel 9 may also be used to render assistance’to a motorist.

11. OFF-NB/ANL SWITCH. In the NB/ANL position, the RF noise blanker is activated and automatic noise limiter in the audio circuits is also activated. The F noise blanker is very effective for repetitive impulse noise such as ignition interference.

12. TONE SWITCH-HI/LOW. This switch is used to shape the audio response to the operator’s preference. Bass is increased in the LOW position and treble is increased in the HI position.

13. BAND SELECTOR. This switch selects HI; MID or LOW band of operation.

B. INDICATOR FUNCTIONS

1. SMETER. Swings proportionally to the strength of the incoming signal.
2. RF METER. Swings proportionally to-the RF output power.
3. SWR METER. Swings proportionally to the ratio of standing wave voltage and RF output. 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 humidity, salt spray, vibration or corrosion, the SWR meter reading will rise, thereby indicating that a problem exists. To calibrate, switch to the “CAL” position transmit by pressing the mike switch, and adjust the SWR control to the “CAL” mark on the meter then switch to “SWR” position for the SWR measurement.
4. CHANNEL INDICATOR. Numbered LED indicates the selected channel you wish to operate on. LED indicates “9”” when CH- is switched on. 5. RECEIVER/TRANSMIT INDICATOR. The receiver/transmit LED indicator is located next to the channel indicator. When in receive, the LED will be green. When in transmit the LED will be red.
5. PRESS-TO-TALK MICROPHONE. The receiver and transmitter are controlled by the pressto 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 radios come complete with low-impedance (500 ohm) dynamic microphone. For installation instructions on other microphones, see next section, “ALTERNATE MICROPHONES AND INSTALLATION.”

OPERATING PROCEDURE TO RECEIVE

1. Be sure that power source, microphone and antenna are connected to the proper connectors before going to the next step.
2. Tum unit on by tuning VOL control clockwise on COBRA 148GTL-DX.
3. Set the VOLUME for a comfortable listening level.
4. Set’the MODE switch to the desire mode.
5. Listen to the background noise from the sp/eaker‘ Tumn the SQUELCH control slowly clockwise until the noise JUST disappears (no signal should 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.
6. Set the CHANNEL selector switch to the desired channel.
7. Set the RF gain control fully clockwise for maximum RF gain.
8. Adjust the VOICE LOCK control to clarify the SSB/CW signals or to optimize AM/FM signals.

OPERATING PROCEDURE TO TRANSMIT

1. Select the desired channel of transmission.
2. Set the MIKE GAIN control fully clockwise.
3. If the channel is clear, depress the push-to-talk switch on the microphone and speak in a normal voice.

RECEIVING SSB SIGNALS

There are four types of signals presently used for communications in the . Citizens Band: FM, AM, USB, and LSB. When the MODE switch on your unit is placed in the AM position, only standard double-sideband and in FM position, only frequency deviation, full carrier signals will be detected. An SSB signal may be recognized while in the AM or FM mode by its characteristic “Donald Duck” sound and the inability of the AM or FM detector to produce an intelligible output. The USB and LSB modes will detect upper sideband and lower sideband respectively, and standard AM signals.

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 120 AM channels to 240 SSB channels. The reduction in channel space required also helps in the receiver because only kalf of the noise and interference can be received with 100% of the SSB signal. X 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 modulation is applied to the transmitter’s microphone in the USB mode, the transmitter’s output frequency is increased whereas in the LSB mode the transmitter’s output frequency is decreased. The resuli 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 lowpitched whistle 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.

hus when a voice is used in place of a whistle or tone, in the proper listéning 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.

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 perform- ing the same function as a phonograph speed control. When the speed is set to 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.

OPERATING PROCEDURE TO CW(CARRIER WAVE) MODE

This is communicated by MORSE-CODE. This can be advantageously used especially while channels in busy or communication in long distance.

1.  TRANSMIT. Press CW KEY by MORSE!CODE switching Selector to CW MODE and connecting CW KEY to CW KEY JACK. Your COBRA 148GTLDX transceiver is automatically changed from RX to TX when CW KEY is in (MARK) and keeping the transmitting condition without being transmitted MORSE-CODE during 0.15-second even if CW KEY is in (SPACE). And,thereafter the unit is set in RX condition automatically. Be sure that the CODE transmitted from your station is heard as monitor sound from internal speaker (see Fig. 1).
   

2. RECEIVE. Adjust FINE CONTROL of VOICE LOCK for your desired sound when your transceiver is received MORSE-CODE Signal.

ROGER BEEP

When this switch is placed in the ROGER BEEP position, your radio automatically transmits the audio sign at the end of your transmission. The listener can note easily that your transmission is over through the sign. Please note that this ROGER BEEP transmits 0.15-second at the moment PRESS-TO- TALK SWITCH KNOB is off.

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 afive-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.

4 WIRE MIC CABLE

Pin Number: Mic   Cable Lead

1. Audio Shield
2. Audio Lead
3. Transmit Control 4 Receive Control

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 7/16″ beyond the plastic insulating jacket of the microphone cable.
2. All leads shoudl be cut to the same length. Strip the ends of each wire 1/8″ and tin the exposed wire.

Before begining the actual wiring read carefully, the circuit and wiring information provided with the microphone you select. Use the minimum head required in soldering the connections. Keep the exposed wire.lengths to a minimum to avoid shorting when the microphone plug is reassembled.

Fig. 4. Microphone plug wiring.

1. Remove the retaining screw.

2. Unscrew the housing from the pin receptacle body.

3. Loosen the two cable clamp retainer screws.

4. Feed the microphone cable through the housing, knurled ring and washer as shown Fig. 4.

5. The wires must now be soldered to the pins as indicated in the above wiring tables. If a vise or clamping tool is available it should be used to hold the pin receptacle body during the soldering operation, so that both hands are free to perform the soldering. If a vise or clamping tool is not available, the pin receptacle body can be  heldin a stationary position by inserting it into the microphone jack of the front panel. The numbers of the pins of the microphone plug are shown in Fig. 5, as viewed from the back of the plug. Before soldering the wire to the pins, pre-tin the wire receptacle of each pin of the plug.

6. Fig. 5. Microphone plug pin numbers viewed from rear of pin receptacle.
   Be sure that the housing and the knurled ring of Fig. 3 are pushed back onto the microphone cable before starting to solder. If the washer is not captive to the pin receptacle body, make sure that it is placed on the threaded portion of the pin receptacle body before soldering.
   If the microphone jack is used to hold the pin receptacle during the soldering ~operation, best-results-are-obtained when the connections.to pins 1 and 3 are made first and then the connections to pins 2, 4 and 5. Use a minimum amount of solder and be careful to prevent excessive solder accumulation on pins, which could cause a short between the pin and the microphone plug housing.

7. When all soldering connections to the pins of the microphone plug are complete, push the knurled ring and the housing forward and screw the housing onto the threaded portion of the pin receptacle body. Note the location of the screw clearance hole in the plug housing with respect to the threaded hole in the pin receptacle body. When the housing is completely threaded into the pin receptacle body, a final fraction of a turn either clockwise or counterclockwise may be required to align the screw hole with the threaded hole in the pin receptacle body. When these are aligned, the retaining screw is then screwed into the place to secure the housing to the pin receptacle body.

8. The two cable clamp retainer screws should now be tightened to secure the housing to the microphone cord. If the cutting directions have been carefully followed, the cable clamp should secure to.the insulating jacket of the microphone cable. -~

9. Upon completion of the microphone plug wiring, connect and secure the microphone plug in the transceiver.

Section V Maintenance and Adjustment

The COBRA 148GTL-DX transceiver is specifically designed for the environment encountered in mobile 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 instructions to insure that proper procedures were followed. If a prob- lem still exists, refer to WARRANTY SERVICE INSTRUCTIONS elsewherre in this manual.

Section VI Appendix

Citizens Band radio operators have largely adopted the “10-code™ 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

Code10-1
10-2
10-3| MeaningReceiving poorly Receiving wellStop transmitting.| Code10-2910-30| MeaningTime is up for contactDoes not conform to FCC
---|---|---|---
10-4| OK, message received| | tules
10-5| Relay message| 10-32| I will give you a radio check
10-6| Busy, stand by| 10-33| EMERGENCY TRAFFIC
10-7| Out of service, leaving air| 10-34| Trouble at this station
10-8| In service, subject to call| 10-35| Confidential information
10-9| Repeat message| 10-36| Correct time is
| | 10-37| Wrecker needed at
10-10| Transmission completed,| 10-38| Ambulance needed at
| standing by| 10-39| Your message delivered
10-11| Taking too rapidly| |
10-12| Visitors present| 1041| Please turn to channel
10-13| Advise Weather/Road| 1042| Traffic accident at
| conditions| 10-43| Traffic Tie up at
10-16| Make pick up at| 10-44| I have a message for you
10-17| Urgent business| 10-45| All units within range please
10-18| Anything for us?| | report
10-19| Nothing for you, return to| |
| base| 10-50| Break channel
10-20| My location is| 10-60| What is next message number?
10-21| Call by telephone| 10-62| Unable to copy, use phone
10-22| Report in person to| 10-63| Net directed to
10-23| Stand by| 10-64| Net clear
10-24| Completed last assignment| 10-65| Awaiting your next
10-25| Can you contact| | Message/assignment
10-26| Disregard last information| 10-67| All units comply
10-27| I am moving to channel| |
10-28| Identify your station| 10-70| Fire at

A FEW RULES THAT SHOULD BE OBEYED

1. You must identify your official licensed call sign at the beginning and end of every conversation. –
2. 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.
3. You are not allowed to blast others off the air by over-powering them with illegally amplified transmitter power, or illegally high antennas.
4. You can’t use CB to promote illegal activities.
5. You are not allowed to use profanity.
6. You may not play music in your CB.
7. You may not use your CB to sell merchandise or professional services.

HOW YOUR CB CAN SERVICE YOU

• Wam of traffic tie ups ahead. ‘
• Provide weather and road information.
• Provide help fast in event of emergency or breakdown.
• Suggest good sports 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. e Provide “local information” to find your destination.
• Help law enforcement officers by reporting drunk and reckless drivers.

Colonel Samuel S. Smith of the Missouri Highway Patrol called the numbers of drunken drivers, wrong-way drivers and speeders reported by CBers as “amazing.” He said, that even the “Smokey Bear” warnings don’t shake their beliefs that “the potential benefits of CB radio to law enforcement are so great that they far outweight the disadvantages.” In regards to CB radar warnings to other CBers, Colonel Smith said cheerfully that “We’ve overheard warnings being relayed to truckers long after our operations have been discontinued…so we actually receive a residual benefit from these warnings.”

USE CHANNEL 9 FOR EMERGENCY MESSAGES ONLY

FCC gives the following examples of permitted and prohibited types of communications for use on Channel 9. These are guidelines and are not intended to be all:inclusive.

Permitted: Example Message

Yes: “A tormnado sighted six miles north of town.”
No: “This is observation post number 10. No tornado sighted.”
Yes: “I’am out of gas on Interstate 95.”
No: “I am out of gas in my driveway.”
Yes: “There is a four-car collision at Exit 10 on the Beltway, send police and ambulance.”
No: “Traffic is moving smoothly on the Beltway.”
Yes: “Base to Unit 1, the Weather Bureau has just issued a thunderstorm warning. Bring the sailboat into port.”
No : “Attention all motorists. The Weather Bureau advises that the snow tomorrow will accumulate 4 to 6 inches.”
Yes: “There is-a fire in the building on the corner of 6th and Main Streets.”
No: “This is Halloween patrol unit number 3. Everything is quiet here.”

WARRANTY SERVICE INSTRUCTIONS

1. Refer to the MAINTENANCE section of your Cobra instruction manual for adjustments that may be applicable. : )
2. If the above-mentioned procedures do not correct the problem you are experiencing with your unit, pack it securely (preferably in the original carton or double-packed). Enclose a letter describing the problem and include your name and address. Deliver to, or ship PREPAID (UPS preferred) to the nearest Cobra authorized service agency (see list enclosed with unit). If your list of authorized Cobra service agencies has been misplaced, contact your local dealer for the name of your nearest service agency, or write to:

Service Department

Cobra Product Group DYNASCAN CORPORATION 6460 W. Cortland Street Chicago, Illinois 60635

90 DAY LIMITED WARRANTY WITH 1 YEAR FREE PARTS

DYNASCAN CORPORATION warrants to the original purchaser that its COBRA GTL Citizens Band Radios, and the component parts thereof, will be free from defects in workmanship and materials for a period of 90 days from the date of purchase. Component parts are warranted for one (1) year from the date of purchase.

DYNASCAN will, without charge, repair or replace, at its option, defective radios or component parts upon delivery to an authorized COBRA service station or the factory service department, accompanied by proof of the date of purchase in the form of a sales receipt. After 90 days parts will be supplied at no charge up to one vear from date.of purchase, the original purchaser being responsible for all labor and other charges.

Exclusions: This warranty does not apply in the event of misuse or abuse of the product or as a result of unauthorized alterations or repairs. It is void if the serial number is altered, defaced or removed.

As indicated in your product instruction booklet, certain COBRA models are suitable for dashboard installation without modification of the dash. In ‘other cases professional installation is recommended. In either event, DYNASCAN is not responsible for damages to the product or the automobile resulting from improper installation.

DYNASCAN shall not be liable for any consequential damages, including without limitation damages resulting from loss of use or cost of installation. Some states do not allow limitation of incidental or consequential damages, so the above limitation or exclusion may not apply to you

‘This warranty gives you specific rights and you may also have other rights which vary from state to state.

For your convenience we suggest vou contact your dealer, who may be authorized to make repairs or can refer you to the nearest service station. If warranty service cannot be obtained locally, please send the unit to Cobra Communications Service, 6460 West Cortland Avenue, Chicago, Illinois 60635, properly packaged to avoid damage in shipment.

NOTE

For future reference; jot down the serial number (shown on the FCC identification plate of your COBRA 148GTL-DX) below:

Cobra Communications Product Group
DYNASCAN CORPORATION
6460 W. Cortland Street
Chicago, lIIipois 60635

References

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