Cobra 148 GTL User Manual

How To Use Your
40-CHANNEL,
CITIZENS BAND
SSB/AM 2-WAY MOBILE RADIO
Model 148 GTL
Contents Page
The CB Story ....................................................................................
1
Section I: Introduction......................................................................2
Section II: Specifications ..............................................................3, 4
Section III: Installation ........................................................5, 6, 7, 8
Section IV: Operation................................................................9 - 17
Controls and Indicators ....................................................................9
A.Control Functions..............................................................9, 10, 11
B.Indicator Functions ......................................................................12
Operating Procedure to Receive......................................................12
Operating Procedure to Transmit ....................................................13
Receiving SSB Signals ..............................................................13, 14
Alternate Microphones and Installation ..............................15, 16, 17
Section V: Maintenance and Adjustment ..................................18 -21
FCC Warning ..................................................................................18
Section VI: Appendix ..........................................................19, 20, 21
Ten Code ........................................................................................19
A few Rules That Should Be Obeyed ..............................................20
How Your CB Can Serve You ..........................................................20
Use Channel 9 for Emergency Messages Only ................................21
Warranty Service Instructions..........................................................22
Limited Two Year Warranty..............................................................23
Cobra CB Radio Accessories ..................................Inside Back Cover
OPERATING INSTRUCTIONS FOR YOUR
40 CHANNEL
CITIZENS BAND
SSB/AM 2-WAY
MOBILE RADIO
Model 148 GTL

Cobra 148 GTL Specifications

General

Operating frequency	26.965 - 27.405 MHz

Weight and Dimensions

Weight	3066 g
Dimensions (WxDxH)	200 x 247 x 60 mm

Summary

The CB Story

Section I Introduction

Section II Specifications

GENERAL

Covers general characteristics like channels, frequency range, and power.

TRANSMITTER

Outlines transmitter capabilities such as power output and modulation.

RECEIVER

Lists receiver specifications including sensitivity and selectivity.

PA SYSTEM

Details specifications related to the Public Address system.

Section III Installation

LOCATION

Advice on selecting an appropriate location for mounting the transceiver.

MOUNTING THE CONNECTION

Step-by-step instructions for mounting the unit and connecting cables.

IGNITION NOISE INTERFERENCE

Discusses methods to mitigate electrical noise interference.

ANTENNA

Information on antenna selection and installation for optimal performance.

Section III Installation (Continued)

TUNING THE ANTENNA FOR OPTIMUM SWR

Detailed steps for tuning the antenna to achieve the best SWR.

EXTERNAL SPEAKER

How to connect and use an external speaker with the unit.

PUBLIC ADDRESS

Instructions for operating the Public Address system feature.

Section IV Operation

CONTROLS AND INDICATORS

Identifies and describes the front panel controls and indicators.

A. CONTROL FUNCTIONS

Detailed explanation of each control's function and adjustment.

B. INDICATOR FUNCTIONS

Explains the meaning and function of the unit's indicators.

OPERATING PROCEDURE TO RECEIVE

Step-by-step guide for receiving radio transmissions.

Section IV Operation (Continued)

OPERATING PROCEDURE TO TRANSMIT

Step-by-step guide for transmitting radio signals.

RECEIVING SSB SIGNALS

How to properly receive Single Sideband (SSB) signals.

Section IV Operation (Continued)

RECEIVING SSB SIGNALS

Explains how to receive and tune SSB signals, and the effect of mode selection.

Section IV Operation (Continued)

ALTERNATE MICROPHONES AND INSTALLATION

Instructions for connecting and installing alternative microphones.

Section IV Operation (Continued)

Section V Maintenance and Adjustment

FCC WARNING

Important warnings regarding FCC regulations and part substitutions.

Section VI Appendix

10 CODE

Lists common CB radio 10-codes and their meanings for communication.

A FEW RULES THAT SHOULD BE OBEYED

Key rules and regulations for operating CB radio transmissions.

HOW YOUR CB CAN SERVE YOU

Examples of how a CB radio can be useful for various situations.

Section VI Appendix (Continued)

USE CHANNEL 9 FOR EMERGENCY MESSAGES ONLY

Guidelines for permitted and prohibited communications on Channel 9.

If You Need Service

LIMITED TWO YEAR WARRANTY

COBRA CB RADIO ACCESSORIES