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Asked by Geetanjali Last Modified
Answer Ground wave propagation refers to the transmission of radio waves along or near the surface of the Earth. When a radio signal is transmitted, it spreads out in all directions. Ground wave propagation occurs when these radio waves travel close to the Earth's surface, typically within the first few kilometers. This mode of propagation is commonly used for medium-wave (AM) and long-wave radio transmissions.
There are two primary components to ground wave propagation:
Surface Wave: This is the portion of the radio wave that travels along the Earth's surface. It follows the curvature of the Earth and can propagate over considerable distances, especially at lower frequencies. Surface waves are affected by terrain, soil conductivity, and other factors.
Space Wave: This component involves a combination of direct waves that propagate straight from the transmitter to the receiver and reflected waves that bounce off the ground or other obstacles before reaching the receiver. Space waves are more dominant at higher frequencies and shorter distances.
Ground wave propagation is affected by various factors including frequency, terrain, atmospheric conditions, and the conductivity of the Earth's surface. It's used for broadcasting purposes due to its ability to provide relatively consistent coverage over large areas, especially in regions with challenging terrain where line-of-sight transmission may be obstructed. However, it has limitations in terms of range and susceptibility to interference from other sources.
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