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Definition of "Audio-Subcarrier" |
The carrier between 5 MHz and 8 MHz containing audio or voice information inside of a video carrier. / In telecommunication, an atmospheric duct is a horizontal layer in the lower atmosphere in which the vertical refractive index gradients are such that radio signals and light rays are guided or ducted, tend to follow the curvature of the Earth, and experience less attenuation in the ducts than they would if the ducts were not present. The duct acts as an atmospheric dielectric waveguide and limits the spread of the wavefront to only the horizontal dimension. |
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