Radio Shack 20-521 owner manual Setting the Scanner to the Trunk Tracking Mode

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The fleets might be the police department, the fire de- partment, utilities, and city administration. The police might decide to further divide its fleet into subfleets such as dispatch, tactical operations, detectives, north, south, east and west side patrols, and supervisors. All the available police radios would then be assigned to one of the police subfleets, letting the police centralize their communications and control the type of users on a single system. Determining the exact fleet-subfleet hierarchy for a particular area is referred to as fleet map programming.

The disadvantage of a Type I system is that the brief burst of data sent when a user transmits must contain the radio’s ID and its fleet and subfleet. This is three times the amount of data a Type II system radio sends. Since the data capacity of Type I systems is limited and the amount of data increases with each user, Type I systems usually accommodate fewer users than Type

IIsystems. Nevertheless, Type I systems are still in use.

There are also hybrid systems which are a combination of both Type I and Type II. Your scanner defaults to monitor Type II systems, but you can change to Type I or a hybrid of Type I and Type II systems by selecting a preprogrammed fleet map or creating a custom fleet map for your area (see “Scanning Type I and Hybrid Trunked Systems” on Page 50).

You do not need to determine the fleet-subfleet hierar- chy for Type II systems unless you are tracking hybrid systems that contain both Type I and Type II systems.

SETTING THE SCANNER TO THE TRUNK TRACKING MODE

Press TRUNK to switch between conventional scanning and trunk tracking.

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Contents PRO-91 150-Channel Handheld Trunking Scanner Features Page Frequency Step Transmission Range MHz KHz FCC Notice Scanning LegallyContents 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 AntennaTraffic Safety Connecting AN EARPHONE/ HeadphonesListening Safely Connecting AN Extension Speaker Attaching the Belt ClipAbout 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 OperationStoring Known Frequencies Into Channels Searching for and Temporarily Storing Active Frequencies Limit SearchDirect Search Service Bank Search Search Skip Memory Listening to the Monitor Memories Moving a Frequency from a Monitor Memory to a ChannelScanning 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 HypersearchTurning the Battery Save Function OFF/ON Turning the KEY Tone OFF/ONSkipping Data Signals Trunk Tracking Types of Trunking SystemsSetting 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 MemoryUnlocking a Single ID Locking Out IDsUnlocking All IDs Using Trunk Tracking Scan Delay Monitoring IDsChannel Activity Bars Scan Lists Manually Storing IDs into Scan ListsMoving IDs to Scan Lists Deleting a Stored IDScanning the Scan Lists Scanning Type I and Hybrid Trunked SystemsProgramming 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 FrequenciesGuide to the Action Bands Typical Band UsagePrimary Usage VHF BandBand Allocation AbbreviationsVery High Frequency VHF Ultra High Frequency UHF Frequency Conversion Troubleshooting Problem Possible Remedy CauseError 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