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A '''scanner''' is a [[radio]] [[receiver]] generally capable of picking up [[Amplitude_modulation|AM]] and [[FM]] (and sometimes [[Single-sideband modulation|SSB]]) radio [[signal (disambiguation)|signal]]s anywhere from 100 [[kHz]] to 3.3 [[GHz]] (as a comparison, the standard
Radio scanners first became [[popular]] and widely available during [[Citizens'_band_radio|CB Radio]]'s heyday in the 1970s. The first scanners used [[Crystal_radio_receiver|crystal]]s and had only a few programmable [[channel]]s. Modern scanners allow thousands of frequencies to be stored in various 'memory banks' and can scan at a very fast rate due to modern micro-processors, they even allow scanning of the specific [[DCS]] or [[CTCSS]] code used on a specific frequency should it have multiple users. One memory bank can be assigned to overseas broadcasters, another can be for local [[marine]] communications and yet an other for local [[police]] frequencies that can be switched depending on the user's [[preference]]. Many modern [[amateur radio]] (transceive-capable) hand-helds (H/T's) are being designed with advanced wide-band scanning features for little more [[money]] than their receive-only cousins and are usually more ruggedly built. Lists of local frequencies are often available through the [[internet]] or local amateur radio clubs. A telescoping (extendable) [[Antenna_(electronics)|antenna]] is a good idea for optimum performance if you are monitoring a wide variety of bands (longer for lower frequencies).
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