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प्रश्न
Line of sight propagation is also called as_________________ .
विकल्प
sky wave
ground wave
sound wave
space wave
उत्तर
space wave
APPEARS IN
संबंधित प्रश्न
What is space wave propagation?
What is space wave propagation?
Derive an expression for the maximum line of sight distance between two antennas for space wave propagation.
Is it necessary for a transmitting antenna to be at the same height as that of the receiving antenna for line-of-sight communication? A TV transmitting antenna is 81m tall. How much service area can it cover if the receiving antenna is at the ground level?
In which directions do the electric and magnetic field vectors oscillate in an electromagnetic wave propagating along the x-axis?
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?
Explain why this mode cannot be used for long distance communication using high frequencies.
Is it necessary for a transmitting antenna to be at the same height as that of receiving antenna for LOS communication ?
Name the three different modes of propagation of electromagnetic waves. Explain, using a proper diagram the mode of propagation used in the frequency range from a few MHz to 40 MHz.
Mention three different modes of propagation used in communication system.
Propagation of Electromagnetic Wave?
Answer the following question.
In the skywave mode of propagation, why is the frequency range of transmitting signals restricted to less than 30 MHz?
Light from a sodium lamp (S) passes through two polaroid sheets P1 and P2 as shown in fig. What will be the effect on the intensity of the light transmitted (i) by P1 and (ii) by P2 on the rotating polaroid P1 about the direction of propagation of light? Justify your answer in both cases.
What do you mean by skip distance?
The wavelength of electromagnetic wave employed in space communication very over a range of
The radio wave of frequency 300 MHz to 3000 MHz be.long to
An antenna is
Polarization in e.m wave is caused by
In which frequencies range space waves are normally propagate:-
Propagation constant of a transmission line is
The characteristic impedance of a coaxial cable is of the order of
The component of the ground wave attenuated by conducting earth is ______.
Three waves A, B and C of frequencies 1600 kHz, 5 MHz and 60 MHz, respectively are to be transmitted from one place to another. Which of the following is the most appropriate mode of communication ______.
The maximum frequency for reflection of sky waves from a certain layer of the ionosphere is found to be fmax = 9(Nmax)1/2, where Nmax is the maximum electron density at that layer of the ionosphere. On a certain day, it is observed that signals of frequencies higher than 5 MHz are not received by reflection from the F1 layer of the ionosphere while signals of frequencies higher than 8 MHz are not received by reflection from the F2 layer of the ionosphere. Estimate the maximum electron densities of the F1 and F2 layers on that day.
