Connecting AN EARPHONE/ Headphones | Radio Shack 20-521 instruction

CONNECTING AN EARPHONE/ HEADPHONES

For private listening, you can plug an earphone or mono headphones (such as Cat. No. 33-178 or 20-

210)into the jack on top of your scanner. This auto- matically disconnects the internal speaker.

Listening Safely

To protect your hearing, follow these guidelines when you use an earphone or headphones.

•Do not listen at extremely high volume levels. Extended high-volume listening can lead to per- manent hearing loss.

•Set the volume to the lowest setting before you begin listening. After you begin listening, adjust the volume to a comfortable level.

•Once you set the volume, do not increase it. Over time, your ears adapt to the volume level, so a vol- ume level that does not cause discomfort might still damage your hearing.

Traffic Safety

Do not use an earphone or headphones with your scanner when operating a motor vehicle in or near traf- fic. Doing so can create a traffic hazard and could be il- legal in some areas.

If you use an earphone or headphones with your scan- ner, be very careful. Do not listen to a continuous broadcast. Even though some earphones/headphones let you hear some outside sounds when listening at normal volume levels, they still can present a traffic hazard.

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Radio Shack 20-521 owner manual Connecting AN EARPHONE/ Headphones, Listening Safely, Traffic Safety

Contents

PRO-91 150-Channel Handheld Trunking Scanner Features Page Frequency Step Transmission Range MHz KHz FCC Notice Scanning Legally Contents Trunk Tracking Special FeaturesGeneral Guide to Scanning Page Using Internal Batteries Power SourcesPreparation Page Charging Nickel-Cadmium Batteries Using AC Power Using Vehicle Battery Power Plug the adapter’s barrel plug into your scanner’s Connecting the Antenna Connecting an Optional Antenna Traffic Safety Connecting AN EARPHONE/ HeadphonesListening Safely Connecting AN Extension Speaker Attaching the Belt Clip About Your Scanner Look AT the Keypad Look AT the Display Page Understanding Banks Service BanksChannel Storage Banks Monitor Memories Turning on the Scanner and Setting Squelch Operation Storing Known Frequencies Into Channels Searching for and Temporarily Storing Active Frequencies Limit Search Direct Search Service Bank Search Search Skip Memory Listening to the Monitor Memories Moving a Frequency from a Monitor Memory to a Channel Scanning the Stored Channels Manually Selecting a ChannelPage Delay Special FeaturesTurning CHANNEL-STORAGE Banks on and OFF Locking OUT Channels PriorityPage Using the Keylock Using the Display BacklightChanging Search Speeds Normal Search Hypersearch Turning the Battery Save Function OFF/ON Turning the KEY Tone OFF/ON Skipping Data Signals Trunk Tracking Types of Trunking Systems Setting the Scanner to the Trunk Tracking Mode Setting Squelch for the Trunk Tracking Mode Storing Trunked FrequenciesPage Scanning a Trunked Bank Monitoring an Active ID Temporarily Storing an ID into the Monitor ID Memory Unlocking a Single ID Locking Out IDsUnlocking All IDs Using Trunk Tracking Scan Delay Monitoring IDs Channel Activity Bars Scan Lists Manually Storing IDs into Scan Lists Moving IDs to Scan Lists Deleting a Stored ID Scanning the Scan Lists Scanning Type I and Hybrid Trunked Systems Programming a Fleet Map Size Fleets Subfleets IDs Blocks Used E1P1 E1P2 E1P3 Size E1P4 E1P5 E1P6 Size Selecting a Preset Fleet Map Programming a Hybrid System General Guide to Scanning Guide to FrequenciesNational Weather Frequencies Canadian Weather Frequencies Guide to the Action Bands Typical Band UsagePrimary Usage VHF Band Band Allocation Abbreviations Very High Frequency VHF Ultra High Frequency UHF Frequency Conversion Troubleshooting Problem Possible Remedy Cause Error Adjust squelch for Resetting the Scanner Care and Maintenance Specifications Power Requirement AA Alkaline Batteries 6.0 VDC Page Page Limited One-Year Warranty RadioShack Division of Tandy Corporation Fort Worth, Texas