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In the study of wired channels, narrow band implies that the channel over 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. That is, no channel has perfectly , but the analysis of many aspects of wireless systems is greatly simplified if flat fading can be assumed.
Narrow band can also be used with the audio spectrum to describe sounds which occupy a narrow range of frequencies.
In telephony, narrow band is usually considered to cover frequencies 300–3400 Hz.
Two-way radio narrow band
Two-Way Radio Narrow banding refers to a U.S. Federal Communications Commission (FCC) Order issued in December 2004 requiring all CFR 47 Part 90 VHF (150-174 MHz) and UHF (421-470 MHz) PLMR (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.
- Electromagnetic Interference
- Land Mobile Radio Service
- Rural Internet