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Cobra 150GTLDX Owner's Manual

Made by: Cobra
Type: Owner's Manual
Category: Radio
Pages: 17
Size: 0.37 MB

 

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A1 English

Our Thanks to You and 
FCC License Required

Owner’s Manual

AMATEUR 10 METER MOBILE RADIO

150 GTL DX

Printed in Philippines

Part No. 480-216-P

Version A

Nothing

comes close to a Cobra

®

English

Nothing

comes close to a Cobra

®

English

© 2005 Cobra

®

Electronics Corporation

6500 West Cortland Street

Chicago, Illinois 60707 USA

www.cobra.com

Introduction

Our Thanks to You

Thank you for purchasing a Cobra amateur mobile radio. Properly used, 

this Cobra product will give you many years of reliable service.

FCC License Required

The United States Federal Communications Commission (FCC) 

requires that users of the frequencies on which this radio operates 

be licensed. See page 16 for licensing and other FCC information.

The Cobra line of quality products includes:

CB Radios

microTALK

®

Radios

Radar/Laser Detectors

Safety Alert

®

Traffic Warning Systems

Handheld GPS Receivers

Mobile GPS Navigation Systems

HighGear

®

Accessories

CobraMarine™ VHF Radios

Power Inverters

Accessories

 


background image

A1 English

Our Thanks to You and 
FCC License Required

Owner’s Manual

AMATEUR 10 METER MOBILE RADIO

150 GTL DX

Printed in Philippines

Part No. 480-216-P

Version A

Nothing

comes close to a Cobra

®

English

Nothing

comes close to a Cobra

®

English

© 2005 Cobra

®

Electronics Corporation

6500 West Cortland Street

Chicago, Illinois 60707 USA

www.cobra.com

Introduction

Our Thanks to You

Thank you for purchasing a Cobra amateur mobile radio. Properly used, 

this Cobra product will give you many years of reliable service.

FCC License Required

The United States Federal Communications Commission (FCC) 

requires that users of the frequencies on which this radio operates 

be licensed. See page 16 for licensing and other FCC information.

The Cobra line of quality products includes:

CB Radios

microTALK

®

Radios

Radar/Laser Detectors

Safety Alert

®

Traffic Warning Systems

Handheld GPS Receivers

Mobile GPS Navigation Systems

HighGear

®

Accessories

CobraMarine™ VHF Radios

Power Inverters

Accessories

 


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A3 English

Microphone and Features

A2 English

Controls and Indicators

Introduction

Introduction

Features

Microphone

Controls and Indicators

- -

4

341 Operating Frequencies

Allows operation on all 

available frequencies.

- -

4

15 Watts Output Power

Provides maximum 

power on AM and FM.

- -

4

Dual Finals

Provides steady output power.

- -

4

Dual Power

Allows operation on Low and 

High power.

- -

4

SWR Calibration

Allows measurement and adjustment

of the antenna system.

- -

4

Antenna Warning Indicator

Illuminates when the antenna system

needs repair or adjustment.

- -

4

Echo Control

Allows control of echo effect.

- -

4

Talk-Back Control

Allows user to monitor 

feedback of output signal.

- -

4

Large Analog Meter

Provides high visibility of 

status meter.

- -

4

NightWatch™ Panel

Electroluminescent illumination of 

front panel for night operation.

- -

4

4 Pin Front Mic Connector

Allows convenient installation 

in-dash.

- -

4

Frequency Counter Jack

Allows connection of a 6-digit

frequency counter.

- -

4

Mic Gain Control

Allows increased voice clarity by

dynamically boosting microphone.

This Cobra radio has a superior receiver that includes an RF gain control and noise 

blanker circuitry as well as an automatic noise limiter. The receiver also features 

increased protection against cross modulation and strong adjacent signals.

To obtain maximum performance, please read carefully the descriptions and 

operating instructions in this manual.

Frequency

Selector

Dim 

(center knob)

SWR CAL

(outer ring)

Analog

Meter

Antenna
Warning

Indicator

Band 

A / B / C / D

PA / AM / FM

RF Power 

Hi / Low

S/RF / SWR / CAL

RX / TX

Indicator

+10 kHz

/ Off

NB/ANL

/ ANL /

Off

Dual 7 

Segment

Frequency

Display

Antenna
Connector

Press-To-Talk

Button (PTT)

External
Speaker

Connector

Public Address (PA)

Speaker Connector

Microphone

Connector

Microphone Gain

(center knob)

RF Gain 

(outer ring)

Power Cord

Connector

Frequency 

Counter Connector

Off / On / Volume

(center knob)

Squelch

(outer ring)

Echo 

(center knob)

Talk Back 

(outer ring)

WARNING

RISK OF ELECTRIC SHOCK. 

DO NOT OPEN. DO NOT REMOVE

COVER OR BACK. NO USER

SERVICEABLE PARTS INSIDE.

REFER TO SERVICING TO

QUALIFIED SERVICE PERSONNEL.

 


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1

Nothing 

comes close to a Cobra

®

Product Features

Contents

Introduction

Introduction

Our Thanks to You  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A1

FCC License Required  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A1

Controls and Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A2

Microphone  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A3

Features  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . A3

Your Mobile Radio

Specifications  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2

Included in this Package  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

Installation and Connection  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5

Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Controls . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Frequency  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Indicators  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Microphone  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Operating to Receive  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Operating to Transmit  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Maintenance  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Government Regulatory Information  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Alternate Microphones and Installation  . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

ARRL Q Signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

Warranty

Warranty  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Trademark Acknowledgement  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Customer Assistance

Product Service  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Accessories  . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Order Form and Optional Accessories . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

 

 


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3

Nothing 

comes close to a Cobra

®

2

English

Specifications

Specifications

Specifications

General

Frequency Range

28.0 to 29.7 MHz

Frequency Control

Phase Lock Loop (PLL) synthesizer

Frequency Stability

0.005%

Operating 

Temperature Range

-22°F to 122°F (-6°C to + 50°C)

Antenna Impedance

50 ohms

Antenna Connector

Standard SO 239 type

Microphone

Plug-in dynamic with Press-To-Talk switch and coiled cord

Input Voltage

13.8 V DC nominal, 15.9 V max., 10.0 V min.

(positive or negative ground)

Current Drain

Transmit: 3.0 A

Receive (squelched): 0.5 A

Receive (maximum audio output): 1.2 A

Size

2

3

8

" (H) x 7

7

8

" (W) x 9

3

4

" (D)

[6 cm (H) x 20 cm (W) x 24.8 cm (D)]

Weight

4.8 lbs.

Meter (3-in-1)

Illuminated – indicates relative output power, 

received signal strength, and SWR

Built-in Speaker

4 watts

Transmitter

Power Output

Low – 4 watts; High – 15 watts

Frequency Response

300 to 3,000 Hz

Frequency Tolerance

500 Hz

Transmit Distortion

2%

Spurious Harmonic 

Emission

-65 dB

Output Indicators

Meter shows relative RF output power and SWR. 

Transmit LED glows red when transmitter is in operation.

Antenna Warning LED

Glows red when SWR is greater than 3.0.

Specifications

Receiver

Sensitivity

AM: 0.5 µV for 10 dB S/N

FM: 0.25 µV for 12 dB S/N

Audio Frequency 

Response

300 to 3,000 Hz

Maximum Signal 

to Noise Ratio

45 dB

Image Rejection

75 dB

Adjacent 

Channel Rejection

65 dB

RF Gain Control (AGC)

40 dB – adjustable for optimum signal reception

Squelch

Adjustable – threshold less than 0.5 µV

Automatic Noise 

Limiter (ANL)

Switchable

Noise Blanker (NB)

Switchable

Receive Indicators

Meter shows relative signal strength.

Receive LED glows green when receiving a signal.

PA System

Power Output

4 watts into PA speaker

Speaker for PA 

(Not Supplied)

8 ohms

External Speaker

Power Output

4 watts into external speaker

External Speaker 

(Not Supplied)

8 ohms

(Specifications subject to change without notice)

Your Mobile Radio

Your Mobile Radio

 

 


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5

Nothing 

comes close to a Cobra

®

Installation and Connection

4

English

Included in this Package

Your Mobile Radio

Your Mobile Radio

Included in this Package

You should find all of the following items in the package with your radio.

Installation and Connection

Refer to the illustration on page A3 for connection points on the back of the 

unit while installing your radio.

- -

4

Location

Plan the location of the transceiver and microphone brackets 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.

- -

4

Mounting

Your mobile radio 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:

- -

4

Mount the Transceiver

1.

After you have determined the most convenient location in your vehicle, hold the mobile

radio with the mounting bracket in the exact location desired. If nothing will interfere

with mounting it in the desired position, remove the thumbscrews and use the

mounting bracket as a template to mark the holes for the mounting screws. Before

drilling the holes, make sure nothing behind the surface will be damaged or interfere

with the installation.

2.

Connect the antenna cable plug to the standard receptacle (ANT) on the rear panel.

Most 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 +13.8 V DC. This wire extends

from the rear panel. Connect directly to positive terminal (red) of vehicle's battery.

4.

Connect the black lead to -13.8 V DC. This is usually the chassis of the car. Any

convenient location with good electrical contact (remove paint) may be used.

5.

Mount the microphone bracket on either side of the transceiver, using the two screws

supplied. When mounting in an automobile, place the bracket under the dash so the

microphone is readily accessible.

6.

Attach the microphone cable to the connector on the face of the transceiver.

NOTE 

If power cables need to be shorter, we recommend attaching a 10 amp 

fuse to positive cable (red) at least six inches from vehicle’s battery.

Transceiver

Universal Mounting Bracket

Operating Instructions

Microphone

Microphone Bracket

A2 English

Controls and Indicators

Introduction

Controls and Indicators

Frequency

Selector

Dim 

(center knob)

SWR CAL 
(outer ring)

Analog

Meter

Antenna
Warning
Indicator

Band 

A / B / C / D

PA / AM / FM

RF Power 

Hi / Low

S/RF / SWR / CAL

RX / TX
Indicator

+10 kHz

/ Off

NB/ANL

/ ANL /

Off

Dual 7 

Segment

Frequency

Display

Antenna
Connector

External
Speaker

Connector

Public Address (PA)
Speaker Connector

Microphone

Connector

Microphone Gain

(center knob)

RF Gain 

(outer ring)

Power Cord

Connector

Frequency 

Counter Connector

Off / On / Volume

(center knob)

Squelch

(outer ring)

Echo 

(center knob)

Talk Back 

(outer ring)

 


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7

Nothing 

comes close to a Cobra

®

Installation and Connection

6

English

Installation and Connection

Installation and Connection

- -

4

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.

However, when extremely low-level signals are being received, the transceiver may 

be operated with vehicle engine turned off. The unit requires very little current and

therefore will not significantly discharge the vehicle battery.

Even though your mobile radio 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

two-way radio technician for help in locating and correcting the source of severe noise.

- -

4

Antenna

In addition to transmitter power, the antenna is an 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, 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 purposes, however, the radiation pattern 

is non-directional. 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.

Installation and Connection

- -

4

Tuning the Antenna for Optimum SWR

Because such a wide variety of base and mobile antennas are available, this section 

will concern itself only with the usual types of mobile adjustable antennas.

Antenna length is directly related to signal frequency. Therefore, it must be 

tuned to resonate optimally throughout the frequency range of the transceiver. 

Lower frequencies require a longer antenna than higher frequencies.

Due to the various methods of adjusting antennas for proper SWR, we have 

chosen what we think is the optimum method:

A. Antennas with adjustable screws (setscrews).

1.

Start with the antenna extended and tighten the setscrew lightly enough so 

that the antenna can be lightly tapped with your finger for easy adjustment.

2.

Set your mobile radio to your desired operating frequency or the center of 

the range of frequencies you plan to use. Press the PTT (Press-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 continuing to shorten the antenna, you will

notice the SWR reading will reach a low point and then start rising again. 

This means that you have passed the optimum point for the middle frequency.

3.

Extend the antenna a short distance and again follow the procedure above.

4.

When the lowest point has been reached, switch to 28.0 MHz and then 

to 29.7 MHz and compare SWR readings. They should be almost equal.

B. Antennas that must be cut to proper length.

1.

Follow the procedure as in A 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 off the antenna at one time. 

Once it is cut, it can no longer be lengthened.

3.

The whip is easily cut by filing a notch all the way around, 

then 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 the low and high frequencies in the range you plan to use.

Your Mobile Radio

Your Mobile Radio

 

 


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9

Nothing 

comes close to a Cobra

®

Controls

8

English

Installation and Connection 
and Operation

Installation and Connection

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

1.

All doors must be closed when adjusting the antenna.

2.

Make sure the antenna base is grounded.

3.

Check your coaxial cable routing — it may be pinched where routed into the car.

4.

Try a different location on your car — keeping in mind the radiation pattern you want.

5.

Make sure the antenna is perfectly vertical.

6.

Try a different location in your neighborhood. Stay away from large metal objects 

(metal utility or light poles, fences, etc.) when adjusting.

NOTE

The radio will operate into a SWR of 2 to 1 indefinitely and sustain an 

SWR of 20 to 1 for a maximum of 5 minutes at rated operating conditions.

- -

4

External Speaker

The external speaker jack (EXT) 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 

four watts. When the external speaker is plugged in, the internal speaker is disabled.

- -

4

Public Address

To use the transceiver as a public address system, connect an external 8 ohm speaker 

that is able to handle at least four watts to the PA jack on the rear panel. Direct the

speaker away from the microphone to prevent acoustic feedback. Physical separation 

or isolation of the microphone and speaker is important when operating the PA at high

output levels.

Operation

There are 15 controls and 4 indicators on the front panel of your mobile radio. 

These are shown in the illustration on page A2 which may be folded out for 

reference when using this section.

Controls

- -

4

Off / On / Volume

Turn clockwise to apply power to the unit and to set the desired listening level. 

During normal operation, the volume control is used to adjust the output level 

obtained either at the transceiver speaker or the external speaker, if used.

- -

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, it is desired that the control 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 

that a signal must overcome in order to be heard. Only strong signals will be heard 

at the maximum clockwise setting.

- -

4

Microphone Gain

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. In the

Public Address (PA) mode, the control functions as the volume control for the PA speaker.

- -

4

RF Gain

Used to reduce the gain of the RF amplifier when receiving very strong signals.

- -

4

PA / AM / FM

Selects the mode of operation. In the 

AM

and

FM

positions, the PA function is disabled 

and the unit will transmit and receive on the internal speaker. In the PA mode, incoming

transmissions will be heard through the PA speaker. This allows you to monitor messages

while outside of your vehicle. To use the PA feature, a speaker having a voice coil

impedance of 8 ohms and a power handling capability of at least four watts should be

used. This speaker must be plugged into the PA SPKR jack at the rear of the transceiver. 

If the public address feature is to be used primarily for outdoor applications, the use 

of a weatherproof horn-type public address speaker is recommended. The durability of 

this type speaker plus the inherent efficiency of such a speaker will provide more than

adequate results when combined with the high audio output level available from your

radio. With the PA speaker connected as outlined previously, be sure that there is physical

separation between the microphone and the speaker itself. If the speaker is located too

close to the microphone, acoustic feedback will result when the public address system 

is operated at high volume. A directional-type outdoor speaker reduces the amount 

of isolation required. Some experimentation will determine the minimum amount of

isolation required for a given sound level from the public address system.

NOTE

The microphone gain knob also controls the PA volume when in PA mode.

Your Mobile Radio

Your Mobile Radio

 


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11

Nothing 

comes close to a Cobra

®

Controls

10 English

Controls

Controls

- -

4

RF Power Hi / Low

Places the transmitter in high power (15 watts) mode when the switch is in 

the 

hi

position and in low power (4 watts) mode when it is in the 

low

position.

- -

4

S/RF / SWR / CAL

When this switch is in the 

S/RF

position, the display meter swings proportionally 

to the strength of the signal received or the output power being transmitted.

When it is in the 

SWR

position, the standing wave ratio is measured on the display meter.

When it is in the 

CAL

position, the SWR function can be calibrated on the display 

meter by adjusting the SWR CAL control to move the needle to the calibration mark 

on the display meter face.

- -

4

Dim

Adjusts the NightWatch™ panel and meter brightness from min. to max. 

The antenna warning LED is not affected by this control.

- -

4

SWR CAL

This control is used in conjunction with the S/RF / SWR / CAL switch to calibrate the

standing wave ratio circuit to full scale on the display meter in preparation for measuring

the standing wave ratio that the antenna is presenting to the transceiver.

The standing wave ratio can be checked to insure that maximum power is being radiated

for the longest signal range. The antenna must be in good condition, properly adjusted

and matched to your transceiver. The SWR function of the display meter lets you easily

measure your antenna condition. To operate this function, select a frequency near the

middle of the range such as 28.850 MHz or the one you plan to use most. With the power

on, set the S/RF / SWR / CAL switch to the 

CAL

position. Press and hold the microphone

Press-To-Talk button and, using the SWR CAL knob, adjust the meter to the 

CAL

position

indicated on the display meter. Then, while releasing the microphone button, switch the

S/RF / SWR / CAL switch to the 

SWR

position. Again press and hold the microphone

Press-To-Talk button and read the SWR indicated. Lower figures are the better, with 1

being ideal. Generally, readings up to 3 are acceptable, but a reading greater than 3

indicates that you are losing radiated power and antenna adjustment may be advisable.

Controls

- -

4

NB/ANL / ANL / Off

When this switch is in the 

ANL 

position, only the automatic noise limiter in the audio

circuits is activated. When the switch is placed in the 

NB/ANL

position, the RF noise

blanker also is activated. The RF noise blanker is very effective for repetitive impulse 

noise such as ignition interference. When the switch is in the 

off

position, both the 

noise blanker and the automatic noise limiter are disabled.

- -

4

Echo

This control is used to adjust the output level of the echo circuit. It is also detented 

at the fully counter clockwise position to turn off the echo circuit.

- -

4

Talk Back

This control is used to adjust the desired amount of modulation talk back that is 

present at the speaker during transmit.

Your Mobile Radio

Your Mobile Radio

 

 


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13

Nothing 

comes close to a Cobra

®

Frequency

12 English

Frequency

Frequency

Three controls and one indicator are used together to set and display the radio 

frequency on which your mobile radio will receive and transmit signals. In this 

connection, it is important to understand the frequency bands built into the unit 

and the way they are displayed on the Dual 7 Segment Display.

The 10 meter frequency range is broken down into four bands on your 

mobile radio. These are selected using the Band A / B / C / D knob.

Band

Frequency Range — MHz

A

28.000 – 28.495

B

28.500 – 28.995

C

29.000 – 29.495

D

29.500 – 29.700

Within each band, frequencies can be selected in 5 kHz increments, such as 28.005 MHz 

in Band A or 29.455 MHz in Band C. These are selected using the Frequency Selector

knob after the band has been chosen.

- -

4

Dual 7 Segment Frequency Display

Frequencies are displayed on the Dual 7 Segment Frequency Display using a combination

of numerical figures and decimal points. The figures indicate the first two values after the

decimal point in the frequency, such as the 00 in 28.005 MHz. The right hand decimal point

in the display indicates whether the third value after the decimal point in the frequency is 

0 or 5 — if the right hand decimal is visible on the display, the third value is 5; if it is not

visible, the third value is 0. The left hand decimal point in the display (between the two

figures) indicates whether the two values before the decimal point in the frequency are 

28 or 29 — if the left hand decimal is visible on the display, the first two values are 29; 

if it is not visible, the first two values are 28. Refer to the examples in the following table.

Frequency Display

Frequency

0 0

28.000

0 0.

28.005

0.0

29.000

0.0.

29.005

3 5

28.350

4 5.

28.455

2.5

29.250

6.3.

29.635

Frequency

- -

4

Band A / B / C / D

This control selects the desired frequency band.

- -

4

Frequency Selector

This detented control is a 360º multi-position switch used to increase or 

decrease the operating frequency in 5 or 10 kHz steps within the selected band.

- -

4

+10 kHz / Off

When this switch is in the 

off

position, the operating frequency is increased or 

decreased by 5 kHz with each click of the frequency selector knob. When it is in 

the 

+10 kHz

position, faster tuning is available because the operating frequency is

increased or decreased by 10 kHz with each click of the frequency selector knob.

Your Mobile Radio

Your Mobile Radio

Channel Display

88

28/29 MHz

0/5 kHz

 


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15

Nothing 

comes close to a Cobra

®

Operating to Receive and
Transmit

14 English

Indicators and Microphone

Indicators

- -

4

Analog Meter

The meter needle swings proportionally to the strength of the incoming signal 

or RF output power in receive or transmit modes.

When used to tune the antenna or monitor the quality of the coaxial cable and 

RF electrical connections, the needle swings proportionally to the ratio of standing 

wave ratio and RF output. If there is any degradation in these, due to humidity, 

salt, spray, vibration or corrosion, the SWR meter reading will rise, thereby 

indicating that a problem exists.

- -

4

RX / TX Indicator

This indicator glows green when in receive mode and red when in transmit mode.

- -

4

Antenna Warning Indicator

This indicator glows red whenever the standing wave ratio is greater than 3 to 1.

Microphone

The receive and transmit modes are controlled by the Press-To-Talk (PTT) switch 

on the microphone. Press the switch to transmit, release it to receive. When transmitting,

hold the microphone two inches from the mouth and speak clearly in a normal voice. 

To substitute for the supplied low-impedance (500 ohm) dynamic microphone, 

see the alternate microphones and installation section on page 17.

Operating to Receive

To begin operating your radio:

1.

Be sure the power source, microphone and antenna are properly connected.

2.

Turn the unit on by turning the volume knob clockwise and set the volume for a

comfortable listening level.

3.

Set the PA / AM / FM switch to the desired AM or FM.

4.

Set the RF gain control fully clockwise for maximum RF gain.

5.

Listen to the background noise from the speaker, then turn the squelch ring 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.

Select the desired frequency with the band and frequency selector knobs.

7.

Adjust other controls as desired.

Operating to Transmit

To transmit a signal:

1.

Select the desired frequency for transmission if different from the one 

chosen to receive.

2.

Set the microphone gain knob fully clockwise.

3.

If the frequency is clear, depress the Press-To-Talk switch on the 

microphone and speak in a normal voice.

Your Mobile Radio

Your Mobile Radio

 

 


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17

Nothing 

comes close to a Cobra

®

Alternate Microphones 
and Installation

16 English

Maintenance and Government
Regulatory Information

Maintenance

The 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.

NOTE

If the performance described in the operation sections is not obtained, 

review the installation instructions to insure that proper procedures were 

followed. If a problem still exists, refer to the product service section on page 23.

Government Regulatory Information

This device complies with part 15 of the FCC Rules. Operation is subject to the 

condition that this device does not cause harmful interference.

Transmitting using this radio requires an Amateur Radio License. If you live in the 

United States, visit http://www.fcc.gov or http://www.arrl.org for further licensing

information. In Canada, visit http://strategis.ic.gc.ca or http://www.rac.ca/.

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 microphone must be provided with a four-lead cable. 

The audio conductor and its shielded lead comprise two of the leads. The third lead 

is for receive control, the fourth is for transmit control.

The microphone should provide the functions shown in the schematic below.

- -

4

4 Wire Mic Cable

Pin Number

Mic Cable Lead

1

Grounding

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 (see Fig. 2).

2.

All leads should be cut to the same length. Strip the ends of each wire 

1

8

and tin the exposed wire.

Before beginning the actual wiring, read carefully the circuit and wiring 

information provided with the microphone you select. Use the minimum 

heat required in soldering the connections. Keep the exposed wire lengths 

to a minimum to avoid shorting when the microphone plug is reassembled.

Fig. 1  Cobra microphone schematic

Your Mobile Radio

Your Mobile Radio

 


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Alternate Microphones and Installation

19

Nothing 

comes close to a Cobra

®

Alternate Microphones 
and Installation

18 English

Alternate Microphones 
and Installation

Alternate Microphones and Installation

To wire the microphone cable to the plug provided, proceed as follows:

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. 3B.

5.

The wires must now be soldered to the pins as indicated in the wiring table. 

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 held in a stationary position by inserting it into the microphone jack on the 

front panel. The numbers of the pins of the microphone plug are shown in Fig. 4, 

as viewed from the back of the plug. Before soldering the wires to the pins, 

pre-tin the wire receptacle of each pin of the plug.

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 soldering operation,

best results are obtained when the connections to pins 1 and 3 are made first and 

then the connections to pins 2 and 4. 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.

6.

When all soldering connections to the pins of the microphone 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 place to secure the housing to the pin receptacle body.

7.

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 insulation jacket of the microphone cable.

8.

Upon completion of the microphone plug wiring, connect and secure the 

microphone plug in the transceiver.

Fig. 2  Microphone cable preparation

Fig. 3  Microphone plug wiring

Your Mobile Radio

Your Mobile Radio

3

2

4

1

Fig. 4  Microphone plug pin numbers viewed from rear of pin receptacle

 


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21

Nothing 

comes close to a Cobra

®

ARRL Q Signals

20 English

ARRL Q Signals

ARRL Q Signals

The most commonly used are shown 

bold

Some have slightly modified meanings in everyday usage.

The official list follows.

QRA

What is the name of your station? The name of your station is ____.

QRG

Will you tell me my exact frequency (or that of ____)? Your exact frequency 

(or that of ____) is ____ kHz.

QRH

Does my frequency vary? Your frequency varies.

QRI

How is the tone of my transmission? 

The tone of your transmission is ____ (1. Good, 2. Variable, 3. Bad).

QRJ

Are you receiving me badly? I cannot receive you. Your signals are too weak.

QRK

What is the intelligibility of my signals (or those of ____)? 

The intelligibility of your signals (or those of ____) is ____ 

(1. Bad, 2. Poor, 3. Fair, 4. Good, 5. Excellent).

QRL

Are you busy? I am busy (or I am busy with ____). Please do not interfere.

QRM

Is my transmission being interfered with? Your transmission is 

being interfered with ____ (1. Nil, 2. Slightly, 3. Moderately, 

4. Severely, 5. Extremely).

QRN

Are you troubled by static? I am troubled by static ____ (1-5 as under QRM).

QRO

Shall I increase power? Increase power.

QRP

Shall I decrease power? Decrease power.

QRQ

Shall I send faster? Send faster (____ WPM).

QRS

Shall I send more slowly? Send more slowly (____ WPM).

QRT

Shall I stop sending? Stop sending.

QRU

Have you anything for me? I have nothing for you.

QRV

Are you ready? I am ready.

QRW

Shall I inform ____ that you are calling on ____ kHz? Please inform ____ 

that I am calling on ____ kHz.

QRX

When will you call me again? I will call you again at  ____ (on ____ kHz).

QRY

What is my turn? Your turn is numbered ____.

QRZ

Who is calling me? You are being called by ____ (on ____ kHz).

QSA

What is the strength of my signals (or those of ____)? 

The strength of your signals (or those of ____) is ____. 

(1. Scarcely perceptible, 2. Weak, 3. Fairly Good, 4. Good, 5. Very Good).

QSB

Are my signals fading? Your signals are fading.

ARRL Q Signals

QSD

Is my keying defective? Your keying is defective.

QSG

Shall I send ____ messages at a time? Send ____ messages at a time.

QSK

Can you hear me between your signals and if so can I break in on your

transmission? I can hear you between my signals; break in on my transmission.

QSL

Can you acknowledge receipt? I am acknowledging receipt.

QSM

Shall I repeat the last message which I sent you, or some previous message?

Repeat the last message which you sent me (or message(s) number(s) ____).

QSN

Did you hear me (or ____) on ____ kHz? I did hear you (or ____) on ____ kHz.

QSO

Can you communicate with ____ direct or by relay? 

I can communicate with ____ direct (or by relay through ____).

QSP

Will you relay to ____? I will relay to ____.

QST

General call preceding a message addressed to all amateurs 

and ARRL members. This is in effect “CQ ARRL.”

QSU

Shall I send or reply on this frequency (or on ____ kHz)? 

Send or reply on this frequency (or ____ kHz).

QSV

Shall I send a series of Vs on this frequency (or on ____ kHz)? 

Send a series of Vs on this frequency (or on ____ kHz).

QSW

Will you send on this frequency (or on ____ kHz)? 

I am going to send on this frequency (or on ____ kHz).

QSX

Will you listen to ____ on ____ kHz? I am listening to ____ on ____ kHz.

QSY

Shall I change to transmission on another frequency? 

Change to transmission on another frequency (or on ____ kHz).

QSZ

Shall I send each word or group more than once? 

Send each word or group twice (or ____ times).

QTA

Shall I cancel message number ____? Cancel message number ____.

QTB

Do you agree with my counting of words? I do not agree with your 

counting of words. I will repeat the first letter or digit of each word or group.

QTC

How many messages have you to send? I have ____ 

messages for you (or for ____).

QTH

What is your location? My location is ____.

QTR

What is the correct time? The correct time is ____.

QTV

Shall I stand guard for you? Stand guard for me.

QTX

Will you keep your station open for further communication with me? 

Keep your station open for me.

QUA

Have you news of ____? I have news of ____.

Your Mobile Radio

Your Mobile Radio

 

 


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23

Nothing 

comes close to a Cobra

®

Product Service

22 English

Warranty and Trademark

Acknowledgement

Limited Two-Year Warranty

- -

4

For Products Purchased in the U.S.A.

Cobra Electronics Corporation warrants that its Cobra radios, and the component 

parts thereof, will be free of defects in workmanship and materials for a period of 

two years from the date of first consumer purchase. This warranty may be enforced by 

the first consumer purchaser, provided that the product is utilized within the U.S.A. 

Cobra will, without charge, repair or replace, at its option, defective radios, 

products or component parts, accompanied by proof of the date of first 

consumer purchase, such as a duplicated copy of a sales receipt. 

You must pay any initial shipping charges required to ship the product for 

warranty service, but the return charges will be at Cobra’s expense, if the 

product is repaired or replaced under warranty. 

This warranty gives you specific legal rights, and you may also have other 

rights which may vary from state to state.

Exclusions: This limited warranty does not apply:

1) To any product damaged 

by accident; 2) In the event of misuse or abuse of the product or as a result of

unauthorized alterations or repairs; 3) If the serial number has been altered, 

defaced or removed; 4) If the owner of the product resides outside the U.S.A.

All implied warranties, including warranties of merchantability and fitness for 

a particular purpose are limited in duration to the length of this warranty. Cobra 

shall not be liable for any incidental, consequential or other damages; including, 

without limitation, damages resulting from loss of use or cost of installation. 

Some states do not allow limitations on how long an implied warranty lasts 

and/or do not allow the exclusion or limitation of incidental or consequential 

damages, so the above limitations may not apply to you.

- -

4

For Products Purchased Outside the U.S.A.

Please contact your local dealer for warranty information.

Trademark Acknowledgement 

Cobra

®

, Nothing comes close to a Cobra

®

and the snake design are registered 

trademarks of Cobra Electronics Corporation, USA. Cobra Electronics Corporation™ 

is a trademark of Cobra Electronics Corporation, USA.

Product Service

If you have any questions about operation or installing your new 

Cobra product, or if you are missing parts… 

Please call Cobra first! DO NOT RETURN THIS PRODUCT TO THE STORE! 

- -

4

For Products Purchased in the U.S.A.

If your product should require service, please call at 800-638-3680 to obtain 

a repair authorization number and the address to which to send your radio. 

This will ensure the fastest turnaround time on your repair.

It will be necessary to furnish the following to have the product serviced and returned.

1.

For warranty repair include some form of proof-of-purchase, such as 

a mechanical reproduction or carbon of a sales receipt. If you send the 

original receipt, it cannot be returned. 

2.

Send the entire product. 

3. 

Enclose a description of what is happening with the radio. Include a typed 

or clearly printed name and address of where the radio is to be returned. 

4.

Pack radio securely to prevent damage in transit. If possible, use the 

original packing material. 

5.

Ship prepaid and insured by way of a traceable carrier such as 

United Parcel Service (UPS) or Priority Mail to avoid loss in transit.

6.

If the radio is in warranty, upon receipt of your radio, 

it will either be repaired or exchanged. 

Please allow approximately three to four weeks before contacting Cobra for status. 

If the radio is out of warranty, a letter will automatically be sent informing you of 

the repair charge or replacement charge. 

- -

4

For Products Purchased in Canada

For out of warranty service, ship this product prepaid to: AVS Technologies Inc., 

2100 Trans Canada Hwy S., Montreal, Quebec, H9P 2N4. We reserve the right to 

repair or replace the radio with an equivalent product. Please include the following 

information: Date of Purchase, Model Number, Dealer Purchased From, 

Dealer Address, Dealer Phone Number.

- -

4

For Products Used in Canada

Industry Canada Notice

Operation is subject to the following two conditions: 1) this device may not cause

interference, and 2) this device must accept any interference, including interference that

may cause undesired operation of this device.

- -

4

For Products Purchased Outside the U.S.A. or Canada

Please contact your local dealer for product service information.

Warranty

Customer Assistance

 

 


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25

Nothing 

comes close to a Cobra

®

Order Form and 

Optional Accessories

Customer Assistance

Optional Accessories

You can find quality Cobra products and accessories at your local

Cobra dealer, or in the U.S.A., you can order directly from Cobra.

Ordering from U.S.A.

Call 773-889-3087 for pricing or visit www.cobra.com.

For credit card orders,

complete and return this order 

form to fax number 773-622-2269. Or call 773-889-3087 

(Press 1 from the main menu) 8:00 a.m. to 6:00 p.m. CT, 

Monday through Friday.

Make check or money order payable to:  

Cobra Electronics, Attn: Accessories Dept.

6500 West Cortland Street, Chicago, IL 60707 USA

To order online,

please visit our website: www.cobra.com.

The Cobra 
line of quality
products includes:

CB Radios

microTALK

®

Radios

Radar/Laser Detectors 

Safety Alert

®

Traffic 

Warning Systems

Handheld GPS Receivers

Mobile GPS 
Navigation Systems

HighGear

®

Accessories  

CobraMarine™ 
VHF Radios  

Power Inverters

Accessories

Order Form

Name

Address (No P.O. Boxes)

City

State/Province

Zip/Postal Code    

Country

Telephone

Credit Card Number  

Type:     

Visa   

MasterCard   

Discover

Exp. Date

Customer Signature

Item #

U.S. Cost Each

Qty

Amount

U.S. Subtotal

(Tax if Applicable)

Shipping/Handling

Total

Amount

Shipping/Handling*

$10.00 or less. . . . . . . . . . $3.00

$10.01-$25.00 . . . . . . . . . $5.50

$25.01-$50.00 . . . . . . . . . $7.50

$50.01-$90.00 . . . . . . . . $10.50

$90.01-$130.00 . . . . . . . $13.50

$130.01-$200.00 . . . . . . $16.50

$200.01+. . . . . 10% of purchase

*For AK, HI and PR add 

additional $26.95 for FedEx Next
Day or $10.95 for FedEx 2nd
Day. Excludes weekend and
holiday shipments.

Please allow two to three weeks
for delivery in the U.S. Prices
subject to change without notice.

Tax Table

California . . 7.25%
Illinois . . . . 8.75%
Indiana . . . 6%

Michigan . . 6%
Ohio . . . . . 6%
Wisconsin . 5%

24 English

Accessories

Customer Assistance

Dynamic 
External Speaker

HG S100

$21.95

Noise Canceling 
External Speaker

HG S300

$28.95

Accessories

4 Pin Premium 
Noise-Cancelling Microphone

HG M84

$74.95

4 Pin Premium 
Noise-Cancelling Microphone 

HG M84W

$74.95

Wood Grain

 

 


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A1 English

Our Thanks to You and 
FCC License Required

Owner’s Manual

AMATEUR 10 METER MOBILE RADIO

150 GTL DX

Printed in Philippines

Part No. 480-216-P

Version A

Nothing

comes close to a Cobra

®

English

Nothing

comes close to a Cobra

®

English

© 2005 Cobra

®

Electronics Corporation

6500 West Cortland Street

Chicago, Illinois 60707 USA

www.cobra.com

Introduction

Our Thanks to You

Thank you for purchasing a Cobra amateur mobile radio. Properly used, 

this Cobra product will give you many years of reliable service.

FCC License Required

The United States Federal Communications Commission (FCC) 

requires that users of the frequencies on which this radio operates 

be licensed. See page 16 for licensing and other FCC information.

The Cobra line of quality products includes:

CB Radios

microTALK

®

Radios

Radar/Laser Detectors

Safety Alert

®

Traffic Warning Systems

Handheld GPS Receivers

Mobile GPS Navigation Systems

HighGear

®

Accessories

CobraMarine™ VHF Radios

Power Inverters

Accessories