Uniden UBC72XLT owner manual Simplex Operation, Repeater Operation

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this was the primary way that radio systems operated.

Even today, there are many 2-way radio users who operate using a conventional system:

•Aircraft

•Amateur radio

•PRS (UHF CB) users

•Broadcast AM/FM/TV stations

•Many business radio users

When you want to store a conventional system, all you need to know is the frequencies they operate on. When you are scanning a conventional system, the scanner stops very briefly on each channel to see if there is activity. If there isn’t, the scanner quickly moves to the next channel. If there is, then the scanner pauses on the transmission until it is over.

Simplex Operation

Simplex systems use a single frequency for both transmit and receive. Most radios using this type of operation are limited to line-of-sight operation. This type of radio is frequently used at construction job sites, and with inexpensive consumer radios such as PRS (UHF CB) radios. The range is typically 1.5-12 km, depending upon the terrain and many other factors.

Repeater Operation

Repeater systems use two frequencies: one transmits from the radio to a central repeater; the other transmits from the repeater to other radios in the system. With a repeater-based system, the repeater is located on top of a tall building or on a radio tower that provides great visibility to the area of operation. When a user transmits (on an input frequency), the signal is picked up by the repeater and retransmitted (on an output frequency). The user’s radios always

Understanding Scanning

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Contents UBC72XLT Scanner Precautions PrecautionsUBC72XLT Controls and Display UBC72XLT Controls and DisplayContents Contents Introduction IntroductionFrequency Range Step Mode Transmission MHz KHz Feature Highlights Feature HighlightsAbout This Manual Feature Highlights What is Scanning? What is Searching?Understanding Scanning Conventional ScanningSimplex Operation Repeater OperationWhere To Obtain More Information Information On The InternetIncluded With Your Scanner Included With Your ScannerSetting Up Your Scanner Using Internal BatteriesUsing Non-Rechargeable Batteries Setting Up Your ScannerSetting Up Your Scanner Page Setting Up Your Scanner Using AC Power Connecting the AntennaConnecting an Earphone/Headphone Connecting an Extension SpeakerConnecting an Optional Antenna Attaching the Belt Clip About Your Scanner About Your ScannerLook At The Keypad HoldFunc + Pgm Look At The Display About Your Scanner Service Banks Understanding BanksChannel-Storage Banks Turning On The Scanner Setting Squelch OperationStoring Known Frequencies Into Channels OperationService Search Searching For and Temporarily Storing Active FrequenciesStoring Frequencies into Channels During Service Search Scanning the Stored ChannelsManually Selecting a Channel Special Features Special FeaturesClose CallTM RF Capture Technology Setting the Close Call Options Special Features Using Close Call RF Capture Chain Search Mode Chain SearchChain Search Hold Mode Setting the Search Range Direct Entry SearchDirect Entry Search Hold Mode Search Skip Memory Delay Turning Channel-Storage Banks On and Off Locking Out Channels PriorityUsing Keylock Using the Display BacklightTroubleshooting TroubleshootingTroubleshooting Resetting the Scanner Care and Maintenance CleaningCare and Maintenance General UseRepairs BirdiesSpecifications SpecificationsSeconds Optional Accessories Optional AccessoriesOne Year Limited Warranty One-Year Limited WarrantyUniden Australia PTY Limited Service Division Thank YOU for Buying a Uniden Product
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