![]() ![]() The scanner will stop on an active frequency strong enough to break the radio's squelch setting and resume scanning other frequencies when that activity ceases. ![]() A scanning radio will sequentially monitor multiple programmed channels, or search between user defined frequency limits. ![]() With a radio fixed on a single frequency, much time could pass between transmissions, while other frequencies might be active. Non-broadcast radio systems, such as those used by public safety agencies, do not transmit continuously. Scanners developed from earlier tunable and fixed-frequency radios that received one frequency at a time. Radio scanning serves an important role in the fields of journalism and crime investigation, as well as a hobby for many people around the world. Scanners are often used to monitor police, fire and emergency medical services. Both hand held and desktop models are available. Recent models can follow trunked radio systems and decode APCO-P25 digital transmissions. Today, modern microprocessors have enabled scanners to store thousands of channels and monitor hundreds of channels per second. Early scanners were slow, bulky, and expensive. More often than not, these scanners can also tune to different types of modulation as well ( AM, FM, WFM, etc.). The term scanner generally refers to a communications receiver that is primarily intended for monitoring VHF and UHF landmobile radio systems, as opposed to, for instance, a receiver used to monitor international shortwave transmissions. A scanner (also referred to as a radio scanner) is a radio receiver that can automatically tune, or scan, two or more discrete frequencies, stopping when it finds a signal on one of them and then continuing to scan other frequencies when the initial transmission ceases. ![]()
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