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प्रश्न
In sky wave mode of propagation, why is the frequency range of transmitting signals restricted to less than 30 MHz?
उत्तर
In sky wave mode of propagation, the frequency range of transmitting signals restricted to less than 30 MHz, because it is the maximum frequency below which the signals can be transmitted from one point to another point via reflection from the ionosphere. Above this frequency, the signals will be transmitted through the ionosphere and are not reflected back.
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संबंधित प्रश्न
Write a short note on surface wave propagation of electromagnetic waves.
Derive an expression for the maximum line of sight distance between two antennas for space wave propagation.
What is ground wave communication?
The reflected waves from an ionosphere are _____.
(a) ground waves
(b) sky waves
(c) space waves
(d) very high-frequency waves
What is space wave propagation? Which systems of communication use space waves? What is 'radio horizon' of a transmitting antenna of height h? Why is space wave propagation suitable for frequencies above 40 MHz?
Is it necessary for a transmitting antenna to be at the same height as that of receiving antenna for LOS communication ?
Describe briefly, by drawing suitable diagram, the space wave modes of propagation. Mention the frequency range of the waves in these modes of propagation ?
The frequency range of 3 MHz to 30 MHz is used for ____________.
The length of half wave dipole at 30MH2 is
Two waves A and B of frequencies 2 MHz and 3 MHz, respectively are beamed in the same direction for communication via sky wave. Which one of these is likely to travel longer distance in the ionosphere before suffering total internal reflection?
