Cobra 2010WX User Guide

OPERATING INSTRUCTIONS FOR YOUR

40 CHANNEL

SOLID STATE CITIZENS BAND

SSB/AM TWO-WAY RADIO

BASE STATION

With Seven Weather Channels and

NOAA Emergency Alert Tone

Model 2010 GTL WX

How To Use Your

Cobra

SOLID STATE CITIZENS BAND

SSB/AM 2-WAY RADIO BASE STATION

Model 2010 GTL WX

Contents Page

The CB Story.................................................................................... 1

Section I: Introduction..................................................................... 2

Section II: Specifications ............................................................. 3, 4

Section III: Installation .................................................................... 5

Section IV: Operation............................................................... 6 - 17

Control Functions ................................................................. 6, 7, 8

Indicator Functions....................................................................... 9

Operating Procedure to Receive ................................................. 10

Operating Procedure to Transmit................................................ 10

Operating Procedure to Receive Weather Band.................... 10, 11

Frequency Counter/LCD Digital Clock........................................ 11

Receiving SSB Signals........................................................... 13, 13

Section V: Maintenance and Adjustment ....................................... 14

FCC Warning.............................................................................. 14

Section VI: Appendix ......................................................... 15, 16, 17

Ten Code.................................................................................... 15

A Few Rules That Should Be Obeyed ......................................... 16

How Your CB Can Serve You ..................................................... 16

Use Channel 9 for Emergency Messages Only ............................ 17

Alternate Microphones and Installation .......................... 18, 19, 20

Warranty Service Instructions ..................................................... 21

Limited One Year Warranty........................................................ 22

Cobra CB Radio Accessories.................................. Inside Back Cover

The CB Story

The Citizens Band lies between the shortwave broadcast and 10-meter Amateur radio bands, and was established by law in 1949. The Class D two-way communications service was opened in 1959. (CB also includes a Class A citizens band and Class C remote control frequencies.)

FCC regulations permit only “transmissions” (one party to another) rather than “broadcasts” (to a wide audience). Thus, advertising is not allowed on CB Channels because that is “broadcasting.”

Replacement or substitution of transistors, regular diodes or other parts of a unique nature, with parts other than those recommended by Cobra Electronics, may cause violation of the technical regulations of Part 95 of the FCC Rules, or violation of Type Acceptance requirements of Part 2 of the Rules.

Citizens Band (CB) Radio operators are no longer required to obtain an FCC license to operate their CB equipment or provide station identification. Nevertheless, an operator of a CB radio station is still required to comply with the communications act and with the rules of CB Radio Operation.

What Is Weather Radio?

NOAA WEATHER RADIO (NWR) is a service of the National Oceanic and Atmospheric Administration (NOAA), of the U.S. Department of Commerce. It provides continuous, around-the-clock broadcasts of the latest weather information directly from National Weather Service Offices. The broadcasts are tailored to the weatherinformation needs of people within the receiving area. For example, coastal and Great Lakes' stations provide specialized weather information for area boaters, fishermen and others engaged in marine activities, as well as general weather information for the public-at-large. Three hundred eighty (380) NWR stations are in operation by the U.S. Government in addition to several NWR stations that are maintained by private interest groups.

Under a January 1975 White House policy statement, NOAA Weather Radio was designated as the sole Government operated radio system to provide direct warnings into private homes for both natural disasters and nuclear attack. The capability is to supplement warnings by sirens and by commercial radio and television.

NWR Frequencies and Transmission Characteristics

NWR broadcasts have been allocated seven frequencies within the VHF radio spectrum reserved for Government use. Assigned frequencies are:

162.400 MHz 162.475 MHz 162.525 MHz

162.425 MHz 162.500 MHz 162.550 MHz

162.450 MHz

Section I Introduction

FREQUENCY RANGE

The COBRA 2010 GTL WX transceiver represents one of the most advanced AM base station radios used as a Class D station in the Citizens Radio Service. This unit features advanced Phase Lock Loop (PLL) circuitry providing complete coverage of all 40 channels as shown below.

CB Channel Freq. CB Channel Freq.

Channel in MHz Channel in MHz

1 26.965 2 26.975 3 26.985 4 27.005 5 27.015

6 27.025 7 27.035 8 27.055 9 27.065

10 27.075 11 27.085

12 27.105 13 27.115 14 27.125 15 27.135

16 27.155 17 27.165 18 27.175 19 27.185 20 27.205

The COBRA 2010 GTL WX has a vastly superior receiver which includes noise blanker circuitry and a switchable automatic noise limiter. The receiver also features increased protection against cross modulation and strong adjacent channel signals.

21 27.215 22 27.225 23 27.255 24 27.235 25 27.245

26 27.265 27 27.275 28 27.285 29 27.295 30 27.305

31 27.315 32 27.325 33 27.335 34 27.345 35 27.355

36 27.365 37 27.375 38 27.385 39 27.395 40 27.405

Weather Weather Freq. Channel in MHz

1 162.550 2 162.400 3 162.475 4 162.425 5 162.450 6 162.500 7 162.525

To obtain maximum performance please read carefully the descriptions and operating instructions in this manual. Fill out below;keep for your records.

Serial No. Date of Purchase Dealer Name Keep this manual for detailed information about your Cobra CB radio.

SAVE YOUR SALES RECEIPT, CARTON AND PACKING FOR POSSIBLE FUTURE USE.

Section II Specifications

GENERAL

Channels 40. Frequency Range 26.965 to 27.405 MHz. Frequency Control Phase Lock Loop (PLL) synthesizer. Frequency Tolerance ±130 Hz Typical. Operating Temperature Range -30° C to + 50° C. Microphone Plug-in type; 600Ω dynamic. Power Source 120V AC nominal.

13.8V DC nominal. (Positive or negative ground).

Power Consumption

Current Drain (13.8V DC) Size 5”(H) x 15”(W) x 4 7/16”(D).

Weight 19 1/2 lbs. (Including speaker). Antenna Conductor UHF, S0239. Semiconductors 12 integrated circuits, 3 FETs,

Meter 1 Illuminated; indicates relative power Meter 2 Illuminated; indicates standing wave ratio

Transmit Receive

58 transistors, 79 diodes, 1 LCD. output, received signal strength. and level of modulation.

: AM full mod., 65 watts.

SSB 70 watts.

: Squelched, 30 watts.

Full audio, 40 watts.

: AM and SSB, 2.2A DC (nominal).

: Full audio output, 1.1A DC

TRANSMITTER

Power Output AM, 4 watts.

SSB, 12 watts, PEP.

Modulation High-and low-level Class B, Amplitude

Modulation.

Intermodulation Distortion SSB: 3rd order, more than -25 dB.

5th order, more than -35 dB. SSB Carrier Suppression 55 dB. Unwanted Sideband 50 dB. Frequency Response AM and SSB; 300 to 2500 Hz. Output Impedance 50 ohms, unbalanced Output Indicators

Meter shows relative RF output power and SWR. RX/TX USB/LSB AM ANT.icons on LCD, channel frequency and clock.

Section II Specifications (Cont.)

RECEIVER

Sensitivity SSB: 0.25 µV for 10dB (S+N)/N at greater

than 1/2-watt of audio output. AM: 0.5µV for 10 dB (S+N)/ at greater than 1/2-watt of audio output.

Selectivity AM: 6dB @ 3 KHz, 50 dB @ 9 KHz.

SSB: 6 dB @ 1.1 KHz, 60 dB @ 2.3 KHz. Image Rejection More than 65 dB. IF Frequency AM: 7.8 MHz 1st IF, 455 KHz 2nd IF.

SSB: 7.8 MHz. Adjacent-Channel Rejection 60 dB AM & 70 dB SSB. AM and SSB RF Gain Control 40 dB adjustable for optimum signal

reception. Automatic Gain Control (AGC) Less than 10 dB change in audio output

for inputs from 10 to 100,000 microvolts. Squelch Adjustable; threshold less than 0.25 µV. ANL Switchable. Noise Blanker RF type, effective on AM and SSB. Voice Lock Range ±1.5 KHz. Audio Output Power 4 watts into 8 ohms. Frequency Response 300 to 2500 Hz. Built-in Speaker 8 ohms, round. External Speaker (Not Supplied) 8 ohms; disables internal speaker

when connected.

CLOCK/COUNTER

Clock 24 hr. time. Counter Displays transmit and receive frequency.

WEATHER (WX) RECEIVER

Type Single Conversion, Superhet 455Hz IF. Modulation FM; ± 5 KHz Deviation. Sensitivity Less than 1µV for 12dB Sinad. Frequency Range 162.400 to 162.550 MHz. Channels 7; 25KHz Spacing. Frequency Control Crystal. WX Emergency Warning Phase Lock Loop; 1050Hz. Audio Output Power 4 watts.

(SPECIFICATIONS SUBJECT TO CHANGE WITHOUT NOTICE)

Section III Installation

LOCATION

Prior to beginning operation of the transceiver, a basic installation must be prepared. Installation of the transceiver itself is a rather simple procedure.

In selecting the location for the unit, two basic factors must be considered:

1. Access to a 120V, 60 Hz power source.

2. The location must be convenient for running the antenna lead-in cable if outside

antenna installation is proposed.

BASE STATION ANTENNA

Since the maximum allowable power output of the transmitter is limited by the FCC, the antenna is the most important factor affecting transmission distance. Only a properly matched antenna system will allow maximum power transfer from the 50ohm transmission line to the radiating element.

The recommended method of antenna tuning is to use the built-in SWR meter to adjust the antenna tuning for minimum reflected power on channel 21.

The radio may be used with any type of 50-ohm base station antenna. A ground plane vertical antenna will provide the most uniform horizontal coverage. This type of antenna is best suited for communication with a mobile unit. For point-to-point operation where both stations are fixed, a directional beam will usually increase communicating range since this type of antenna concentrates transmitted energy in one direction. The beam antenna also allows the receiver to "listen" in only one direction thus reducing interfering signals.

Antenna height is an important factor when maximum range is desired. Keep the antenna clear of surrounding structures or foliage. FCC regulations for base station antenna height are:

1. Omnidirectional antennas may not be higher than 60 feet above the ground when

using a tower, mast or pole, and no higher than 20 feet above an existing structure.

These are only general regulations applicable to most but not all parts of the nation. Locations near airports and some military installations are subject to different rules; therfore, it is best to contact your nearest Federal Communications Commission office for information regarding your specific area.

MOBILE OPERATION/EMERGENCY POWER OPERATION

It is possible to operate the Cobra 2010 GTL WX from an external 13.8V DC power supply for emergency conditions or from an automobile battery for mobile operation. We recommend using a genuine Cobra DC power cord (not supplied). The DC power cord can be purchased through your local dealer, or direct from Cobra. See CB radio Accessories on the back page of this manual.

Section IV Operation

CONTROLS AND INDICATORS

There are eighteen controls, 2 meters, 1 LCD and 1 jack on the front panel of your 2010 GTL WX.

POWER

VOLUME

PHONE

MIC

RF PWR

DYNAMIKE

16 17

SQUELCH

R X

+30

SIGNAL

TX ANT

AM / SSB BASE STATION WITH WEATHER ALERTAM / SSB BASE STATION WITH WEATHER ALERT

RF GAIN

MIN

MAX

VOICELOCK

COARSE

2010 GTL WX

USB

HOUR

LSB

FREQ. CTR

LSB

CLOCK

MIN

SWR CALSWR CAL

MOD

100%

ANL

1.5

CAL

SWR

CAL

MOD

CH 9

TUNING

10 13

A. CONTROL FUNCTIONS

1. POWER SWITCH. Press in to turn on radio. Press in, again, and release to turn off

radio.

2. DYNAMIKE. Adjusts the microphone gain in the transmit mode. This controls the gain to the extent that full talk power is available several inches away from the microphone.

3. VOLUME. Turn clockwise to set the desired listening level.

4. SQUELCH . This control is used to cut off or eliminate receiver background noise

in the absence of an incoming signal. For maximum receiver sensitivity the control should be adjusted only to the point where the receiver background noise or ambient background noise is eliminated. Turn fully counterclockwise then slowly clockwise until the receiver noise disappears. Any signal to be received must now be slightly stronger than the average received noise. Further clockwise rotation will increase the threshold level which a signal must overcome in order to be heard. Only strong signals will be heard at a maximum clockwise setting.

5. RF GAIN CONTROL. Adjust as required to optimize the signal. This control is used primarily to optimize reception in strong signal areas. Gain is reduced by counterclockwise rotation of the control.

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