Radio Shack 20-521 manual

3.If you are installing alkaline batteries, use a pointed object such as a pencil to set ALKALINE JACK NI-CDinside the compartment to ALKALINE. Or, if you are installing nickel-cadmium batteries, set it to NI-CD.

Warning: Never set ALKALINE JACK NI-CD to NI-CD if you are installing non-rechargeable bat- teries. Non-rechargeable batteries can get hot or explode if you try to recharge them.

4.Install two batteries in the compartment and two in the cover as indicated by the polarity symbols (+ and –) marked inside those locations.

Cautions:

•Use only fresh batteries of the required size and recommended type.

•Always remove old or weak batteries. Batteries can leak chemicals that destroy electronic cir- cuits.

•Do not mix old and new batteries, different types of batteries (standard, alkaline, or rechargeable), or rechargeable batteries of dif- ferent capacities.

5.Replace the cover.

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Radio Shack 20-521 owner manual

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 Changing Search Speeds Using the KeylockUsing the Display Backlight 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 National Weather Frequencies General Guide to ScanningGuide to Frequencies Canadian Weather Frequencies Primary Usage Guide to the Action BandsTypical Band 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