Cobra Electronics 148 GTL CB Story, Section I Introduction, Frequency Range, MHz

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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 communi- cations 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.”

NOTICE:

Replacement or substitution of transistors, regular diodes or other parts of a unique nature, with parts other than those recommended by Cobra, may cause violation of the techni- cal 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.

An operator of a CB radio station is required to comply with the communications act and with the rules of CB Radio Operation.

Serial No.

Date of Purchase

Dealer Name

Keep this manual for detailed information about your Cobra CB radio.

SAVE YOUR SALES RECEIPT, THE CARTON AND “PACKING” MATERIALS FOR POSSIBLE FUTURE USE.

Section I Introduction

FREQUENCY RANGE

The COBRA 148GTL transceiver represents one of the most advanced SSB/AM two- way radios ever designed for use as a Class D station in the Citizens Radio Service. This unit features advanced Phase Lock Loop (PLL) circuitry, which is used in the AM mode and in the upper and lower single sideband modes, providing complete cover age of all 40 channels shown below.

Channel

Channel Frequency

Channel

Channel Frequency

 

in MHz

 

in MHz

1

26.965

21

27.215

2

26.975

22

27.225

3

26.985

23

27.255

4

27.005

24

27.235

5

27.015

25

27.245

6

27.025

26

27.265

7

27.035

27

27.275

8

27.005

28

27.285

9

27.065

29

27.295

10

27.075

30

27.305

 

 

 

 

11

27.085

31

27.315

12

27.105

32

27.325

13

27.115

33

27.335

14

27.125

34

27.345

15

27.135

35

27.355

16

27.155

36

27.365

17

27.165

37

27.375

18

27.175

38

27.385

19

27.185

39

27.395

20

27.205

40

27.405

 

 

 

 

The COBRA 148GTL has a vastly superior receiver which includes an RF gain con- trol and noise blanker circuitry effective in both AM and SSB modes., and an auto- matic 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 please read carefully the descriptions and oper- ating instructions in this manual.

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Contents Citizens Band SSB/AM 2-WAY Mobile Radio Frequency Range CB StorySection I Introduction Channel Channel FrequencyTransmitter Section II SpecificationsGeneral ReceiverMounting the Connection Section III InstallationLocation Ignition Noise InterferenceAntennas which must be cut to proper length Tuning the Antenna for Optimum SWRAntennas with adjustable screws set screws External SpeakerControl Functions Controls and IndicatorsSection IV Operation Indicator Functions Operating Procedure to ReceiveOperating Procedure to Transmit Receiving SSB SignalsAlternate Microphones and Installation Wire MIC CableSection IV Operation FCC WarningCode Section VI AppendixFEW Rules That should be Obeyed Code MeaningPermitted Example Message If You Need ServiceUSE Channel 9 for Emergency Messages only Order by phone Cobra Electronics Corporation6500 W. Cortland Street Chicago, Illinois Cobra Electronics Corporation