Cobra Electronics 148.GTL.ST Section V Maintenance and Adjustment, How SoundTracker Works

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148.GTL.ST.MANUAL 10/1/98 10:56 AM Page 21

Section V Maintenance and Adjustment

The COBRA 148 GTL ST 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 problem still exists, refer to WARRANTY SERVICE INSTRUCTIONS elsewhere in this manual.

FCC WARNING

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 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.

How SoundTracker Works

SOUNDTRACKER SYSTEM

While previous systems only “blanked out” or limited noise in higher sound fre- quencies, the revolutionary new SoundTracker System actually reduces noise while leaving the signal intact in the reception mode. In the transmission mode, it actually strengthens the signal, providing you with a significant reduction in noise on reception and transmission.

Sound clarity is measured by the ratio of the signal level to the noise level. The higher the signal-to-noise ratio, the better the sound.

HOW SOUNDTRACKER WORKS

On Reception–“Cuts Noise Coming In”

With a normal CB, distant signals fall below the squelch level and are unintelligi- ble. With a SoundTracker CB, the noise level is cut by up to 90%, which increas- es the signal-to-noise ratio and dramatically improves signal clarity. This also allows you to significantly reduce the squelch level, which greatly expands your listening range.

On Transmission–“Strengthens Signals Going Out”

A SoundTracker CB strengthens the transmit signal by more effectively using the available RF power output of the CB. The result is improved transmission signal clarity and an expanded transmission range.

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Contents Citizens Band SSB/AM 2-WAY Mobile Radio SSB/AM 2-WAY Mobile Radio CB StoryGeneral Section II SpecificationsSection I Introduction Frequency RangeLocation Section III InstallationReceiver PA SystemAntenna Tuning the Antenna for Optimum SWRAntennas with adjustable screws set screws Ignition Noise InterferencePublic Address Controls and IndicatorsSection IV Operation External SpeakerSection IV Operation Receiving SSB Signals Indicator FunctionsOperating Procedure to Receive Operating Procedure to TransmitWire MIC Cable Alternate Microphones and InstallationSection IV Operation FCC Warning Section V Maintenance and AdjustmentHow SoundTracker Works Code Meaning Activating/Testing SoundTrackerSection VI Appendix CodePermitted Example Message FEW Rules That should be ObeyedHOW Your CB can Serve YOU USE Channel 9 for Emergency Messages only6500 W. Cortland Street Chicago, Illinois If You Think You Need ServiceCobra Electronics Corporation Fax to Order by phoneMail to
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