Narrowband (narrow bandwidth) refers to a signal which occupies only a small amount of space on the radio spectrum -- the opposite of broadband or wideband. Analog Bandwidth is the width, usually measured in hertz, of a frequency band f2 − f1. ... A signal may refer to: an abstract element of information, or, more exactly, usually a flow of information (in either one or several dimensions). ... The electromagnetic spectrum encompasses all possible wavelengths of electromagnetic radiation. ... Broadband in general refers to data transmission where multiple pieces of data are sent simultaneously to increase the effective rate of transmission. ... Wideband is a relative term used to describe a wide range of frequencies in a spectrum. ...

This is entirely relative to what is being described; for example, an FM broadcast station takes up 150~200kHz on the FM band, whereas a TV station's audio is narrowband, taking up only 25kHz, and weatheradio broadcasts are even narrower than that. It is also very often used to describe radio antennas, called narrowband when they are designed specifically for one frequency or channel only instead of a wide range. In most of the world, the FM broadcast band, used for broadcasting FM radio stations, goes from 87. ... A kilohertz (kHz) is a unit of frequency equal to 1,000 hertz (1,000 cycles per second). ... Weatheradio is a special radio service available over much of North America that transmits weather warnings and forecasts 24 hours a day. ... A yagi antenna Most simply, an antenna is an electronic component designed to send or receive radio waves. ... Sine waves of various frequencies; the lower waves have higher frequencies than those above. ... For the geographical meanings of this word, see channel (geography). ...

Narrowband can also be used with the audio spectrum to describe sounds which occupy a narrow range of frequencies. In telephony narrowband is usually considered to cover frequencies 300-3400Hz. A schematic representation of auditory signaling Sound is an alternation in pressure, particle displacement, or particle velocity propagated in an elastic material (Olson 1957) or series of mechanical compressions and rarefactions or longitudinal waves that successively propagate through medium that are at least a little compressible (solid, liquid or gas...