Carson Bay - Kayaking Trails

Wayzata, MN 55391, USA

Carson Bay - Kayaking Trails

1381 Miles of you

In telecommunication, Carson's bandwidth rule defines the approximate bandwidth requirements of communications system components for a carrier signal that is frequency modulated by a continuous or broad spectrum of frequencies rather than a single frequency. Carson's rule does not apply well when the modulating signal contains discontinuities, such as a square wave. Carson's rule originates from John Renshaw Carson's 1922 paper. Carson's bandwidth rule is expressed by the relation: C B R = 2 ( Δ f + f m ) {\displaystyle CBR=2(\Delta f+f_{m})} where: C B R {\displaystyle CBR} is the bandwidth requirement; Δ f {\displaystyle \Delta f} is the peak frequency deviation; f m {\displaystyle f_{m}} is the highest frequency in the modulating signal. For example, a typical VHF/UHF two-way radio signal using FM mode, with 5 kHz peak deviation, and a maximum audio frequency of 3 kHz, would require an approximate bandwidth of 2 * (5 + 3) = 16 kHz. Standard broadcast stereo FM, with a peak deviation of 75 kHz, has a highest modulating frequency (which combines L+R and L-R) of 53 kHz. Most of the energy therefore falls within an approximate bandwidth of 2 * (75 + 53) = 256 kHz. (Geographically close FM broadcast transmitters are almost always assigned nominal center frequencies at least 400 kHz apart). Carson's bandwidth rule is often applied to transmitters, antennas, optical sources, receivers, photodetectors, and other communications system components. Any frequency modulated signal will have an infinite number of sidebands and hence an infinite bandwidth but, in practice, all significant sideband energy (98% or more) is concentrated within the bandwidth defined by Carson's rule. It is a useful approximation, but setting the arbitrary definition of occupied bandwidth at 98% of the power still means that the power outside the band is about 10 log ⁡ ( 0.02 0.98 ) {\displaystyle 10\log \left({\frac {0.02}{0.98}}\right)} = 17 dB less than the carrier inside, therefore Carson's Rule is of little use in spectrum planning.

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