Radio Shack PRO-91 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 Fm Page 3 Wednesday, August 4, 1999 332 PM Frequency Step Transmission Range MHz KHz FCC Notice Scanning LegallyContents Trunk Tracking Special FeaturesGeneral Guide to Scanning Fm Page 8 Wednesday, August 4, 1999 332 PM Using Internal Batteries Power SourcesPreparation Fm Page 10 Wednesday, August 4, 1999 332 PM 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 Fm Page 21 Wednesday, August 4, 1999 332 PM 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 ChannelFm Page 32 Wednesday, August 4, 1999 332 PM Delay Special FeaturesTurning CHANNEL-STORAGE Banks on and OFF Locking OUT Channels PriorityFm Page 35 Wednesday, August 4, 1999 332 PM 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 II systems. Nevertheless, Type I systems are still in useSetting Squelch for the Trunk Tracking Mode Storing Trunked FrequenciesFm Page 42 Wednesday, August 4, 1999 332 PM 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 Fm Page 69 Wednesday, August 4, 1999 332 PM Fm Page 70 Wednesday, August 4, 1999 332 PM Fm Page 71 Wednesday, August 4, 1999 332 PM Limited One-Year Warranty RadioShack Division of Tandy Corporation Fort Worth, Texas

PRO-91 specifications

The Radio Shack PRO-91 is a handheld scanner that appeals to both amateur radio enthusiasts and professionals seeking a reliable and versatile communication device. Known for its user-friendly design and wide range of features, the PRO-91 is an excellent choice for monitoring various frequencies, including VHF and UHF bands.

One of the standout features of the PRO-91 is its capability to scan frequencies in the 25-1300 MHz range, which allows users to listen in on a variety of communications. This includes police, fire, and emergency services, as well as amateur radio transmissions and aircraft communications. The scanner supports both analog and some digital formats, making it adaptable to different communication standards and ensuring users stay updated with relevant broadcasts.

The PRO-91 comes with 200 programmable channels, allowing users to store their favorite frequencies for quick access. It also features a million frequency search capability, enabling it to detect active signals within the scanning range. Additionally, the scanner includes a priority channel function, permitting users to designate a specific frequency to continuously monitor while scanning through other channels.

Another notable characteristic of the PRO-91 is its triple conversion design, which enhances sensitivity and selectivity, resulting in improved audio clarity and reduced interference. The unit is equipped with a robust speaker that delivers clear sound quality, making it easy to understand transmissions even in noisy environments.

Users will appreciate the ergonomic design of the PRO-91, which features intuitive controls and a backlit LCD display for easy visibility, even in low-light conditions. The keypad layout is designed for straightforward operation, allowing even novice users to navigate through menus and settings with ease.

The PRO-91 is powered by a rechargeable battery, offering extended usage without the need for constant battery replacements. Its compact and lightweight construction makes it portable, making it suitable for on-the-go monitoring.

In conclusion, the Radio Shack PRO-91 offers an impressive array of features, technologies, and characteristics that cater to diverse scanning needs. With its wide frequency range, programmable channels, and superior audio quality, it stands out as a reliable choice for anyone looking to explore the world of radio communication. Whether for recreational use or professional monitoring, the PRO-91 ensures users remain connected to the signals that matter most.
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