Information On narrowband

Two-Way Radio Narrowbanding refers to an [http://hraunfoss.fcc.gov/edocs_public/attachmatch/FCC-04-292A1.pdf FCC Order issued in December of 2004] requiring all [http://www.access.gpo.gov/nara/cfr/waisidx_07/47cfr90_07.html CFR 47 Part 90] VHF (150-174 MHz) and UHF (421-512 MHz) PLMR [http://wireless.fcc.gov/services/index.htm?job=service_home&id=private_land_radio (Private Land Mobile Radio)] licensees operating legacy wideband (25 KHz bandwidth) voice or data/SCADA systems to migrate to narrowband (12.5 KHz bandwidth or equivalent) systems by January 1, 2013. [http://wirelessradio.net Further information, updates, and licensee resources are available here]. {{Unreferenced|date=March 2009}} arrowband refers to a situation in radio communications where the [[Bandwidth (signal processing)|bandwidth]] of the message does not significantly exceed the channels [[coherence bandwidth]]. It is a common misconception that narrowband refers to a channel which occupies only a "small" amount of space on the [[electromagnetic spectrum|radio spectrum]]. The opposite of narrowband is [[wideband]]. In the study of wireless [[channel (communications)|channels]], arrowband implies that the channel under consideration is sufficiently narrow that its [[frequency response]] can be considered flat. The message bandwidth will therefore be less than the [[coherence bandwidth]] of the channel. This is usually used as an idealizing assumption; no channel has perfectly [[flat fading]], but the analysis of many aspects of wireless systems is greatly simplified if flat fading can be assumed. Narrowband can also be used with the [[sound|audio]] spectrum to describe sounds which occupy a narrow range of frequencies. In [[telephony]], narrowband is usually considered to cover frequencies 300–3400 Hz. == See also == * [[Land Mobile Radio Service]] * [[Rural Internet]] * [[Broadband]] * [[Wideband]] * [[Ultra-wideband]] ==External links== * [http://www.fcc.gov/ FCC website] * [http://www.wirelessradio.net/ FCC Part 90 LMR VHF/UHF Narrowbanding Information and Licensee Resources] * [http://www.narrowband.us/ Narrowbanding Resource Guide for 2013] [[Category:Radio terminology]] [[de:Schmalbandkommunikation]] [[ja:ナローバンド]] [[no:Smalbånd]]
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