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When radio waves from a transmitting antenna reach the receiving antenna after reflection in the ionosphere, the wave propagation is called sky wave propagation.
When radio waves from a transmitting antenna reach the receiving antenna after reflection in the ionosphere, the wave propagation is called sky wave propagation.
The sky waves include waves of frequency between 3 MHz and 30 MHz.
The sky waves include waves of frequency between 3 MHz and 30 MHz.
These waves can suffer multiple reflections between the ionosphere and the Earth.
These waves can suffer multiple reflections between the ionosphere and the Earth.
Therefore, they can be transmitted over large distances.
Therefore, they can be transmitted over large distances.
Critical frequency : It is the maximum value of the frequency of radio wave which can be reflected back to the Earth from the ionosphere when the waves are directed normally to ionosphere.
Critical frequency : It is the maximum value of the frequency of radio wave which can be reflected back to the Earth from the ionosphere when the waves are directed normally to ionosphere.
Skip distance (zone) : It is the shortest distance from a transmitter measured along the surface of the Earth at which a sky wave of fixed frequency (if grater than critical frequency) will be returned to the Earth so that no sky waves can be received within the skip distance
Skip distance (zone) : It is the shortest distance from a transmitter measured along the surface of the Earth at which a sky wave of fixed frequency (if grater than critical frequency) will be returned to the Earth so that no sky waves can be received within the skip distance
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