Radio Shack 20-521 owner manual Frequency Step Transmission Range MHz KHz

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Flexible Antenna with BNC Connector — provides excellent reception and is designed to help prevent an- tenna breakage. Or, you can connect an external an- tenna.

Monitor Memories — let you temporarily store up to 5 frequencies or IDs.

Memory Backup — keeps the frequencies stored in memory for an extended time if the PRO-91 loses pow- er.

Three Power Options — let you power the scanner using internal batteries, external AC power using an optional AC adapter/charger, or DC power using an op- tional DC cigarette-lighter power cable.

Key Confirmation Tones — the scanner sounds a tone when you perform an operation correctly, and an error tone if you make an error.

Battery Save — saves battery power when the scan- ner does not detect any transmissions for more than 5 seconds when a channel is manually selected.

Battery Low Alert — warns you when battery power gets low.

Your scanner can receive these bands:

Frequency	Step	Transmission
Range (MHz)	(kHz)
29–29.7	5	10-Meter Ham Band
29.7–50	5	VHF Lo
50–54	5	6-Meter Ham Band
108–136.9750	12.5	Aircraft
137–144	5	Military Land Mobile
144–148	5	2-Meter Ham Band
148–174	5	VHF Hi
406–420	12.5	Federal Government
420–450	12.5	70-cm Ham Band
450–470	12.5	UHF Standard Band
470–512	12.5	UHF “T” Band
806–956	12.5	Public Service
		“800” Band, except
		cellular band

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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