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Narrowband: a channel in which the bandwidth of the message does not significantly exceed the channel's coherence bandwidth.Narrowbanding: 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.Wideband: a channel in which the bandwidth of the message significantly exceeds the coherence bandwidth of the channel. Some communication links have such a high data rate that they are forced to use a wide bandwidth. Ultraband: or Ultra-wideband is a technology for transmitting information spread over a large bandwidth (>500 MHz). Along with techniques such as pulse-position or time modulation the spectrum can be shared by multiple users with low transmit power.