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bandwidth
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Figure 2: Relationship (top) between bandwidth and capacity and (bottom) between P/N and capacity. Figure 3: Exchange of bandwidth for signal-to-noise ratio.
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frequency band
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bandwidth, in electronics, the range of frequencies occupied by a modulated radio-frequency signal, usually given in hertz (cycles per second) or as a percentage of the radio frequency. For example, an AM (amplitude modulation) broadcasting station operating at 1,000,000 hertz has a bandwidth of 10,000 hertz, or 1 percent (10,000/1,000,000). The term also designates the frequency range that an electronic device, such as an amplifier or filter, will transmit.