Radio frequency waves (RF) are generated when an alternating current goes through a conductive material . Waves are characterized by their frequency and length. Frequency is measured in hertz (or cycles per second) and wavelength is measured in meters (or centimeters).
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Sky waves are radio waves reflected by the ionosphere. Therefore, the propagation of these waves is not limited by the curvature of earth. So, these can be used for beyond the horizon communication. Thus, sky waves are used for communication over long (inter-continental) distances.
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There are two types of frequencies: VHF and UHF. VHF is the most suitable for businesses that must communicate across long distances . UHFprovides high yet short wavelengths, best for communicating within smaller spaces and metallic buildings.
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The 7000 kHz (7 MHz or 40 metre) band is useful for daytime communication up to a distance of 800 km via E and F layers. Long distance world-wide communication takes place in this band through F2 layer.
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Audio Frequency Subsets Frequency SubsetFrequency RangeBass60 to 250 HzLower Midrange250 to 500 HzMidrange500 Hz to 2 kHzHigher Midrange2 to 4 kHzUnderstanding Audio Frequency Range in Audio Design | CUI Devices www.cuidevices.com › blog › understanding-audio-frequency-range-in-au…
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Today, civilian radio signals populate the radio spectrum in eight frequency bands, ranging from very low frequency (VLF), starting at 3 kilohertz, and extending to extremely high frequency (EHF),…
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Radio spectrum is the part of the electromagnetic spectrum ranging from 1 Hz to 3000 GHz (3 THz). Electromagnetic waves in this frequency range, called radio waves, have become widely used in modern technology, particularly in telecommunication.
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