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MegahertzA megahertz (MHz) is one million (106) hertz, a measure of frequency. Megahertz in radioWhen used in the context of radio, MHz refers to the number of oscillations of electromagnetic radiation. Severel parts of the radio spectrum fall into the MHz range:
The HF, VHF, UHF references are something of a misnomer: most radiocommunications today occur at higher frequencies due to congestion in the lower frequency bands. Experts in the field of radiocommunications classify these other categories of spectrum by bands. The names of these bands are idosyncratic, but are used often in radiocommunications.
A common alternative means of describing a radio frequency is using its wavelength, though since the adoption of the hertz as an SI unit, this is becoming rare. Wavelength varies inversely to frequency, i.e., high frequencies are associated with short wavelengths. Megahertz in computingMost CPUs made between 1974 and 2000 were labelled in terms of megahertz (though modern computers have processor speeds in the gigahertz (109 hertz) range). The number of megahertz refers to the frequency of the CPU's master clock signal. It is often assumed that if two CPUs have different "clock speeds", the one with the higher clock speed will be faster than the other. However, while clock speed is an important factor in overall performance, many other factors influence the performance of computers, and a better comparison is archived by using benchmarks. For example, a RISC processor, which has very simple instructions that can be accomplished quickly, may run at a higher clock rate (at higher MHz) than a CISC processor with complex instructions. But because the CISC processor accomplishes more during each clock, it may be faster for any real-world application. See also
ca:Megahertz fr:Mégahertz ja:MHz pl:Megaherc Categories: Units of frequency
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