Space Communication
Space Communication: Overview
This topic covers concepts, such as, Mode of Propagation of Electromagnetic Waves, Ground Wave Propagation, Formula of Skip Distance in Sky Wave Propagation & Maximum Usable Frequency in Sky Wave Propagation etc.
Important Questions on Space Communication
Which mode of propagation is used by short wave broadcast services having frequency range from a few MHz upto 30 MHz?
A ground receiver station is receiving a signal at (a) 5 MHz and (b) 100 MHz, transmitted from a ground transmitter at a height of 300 m located at a distance of 100 km. Hence they can be transmitted by space wave: (Given the value of radius of the earth is 6400 km ). The given statement is true or false.
Show the graphical representation of variation of ion concentration in Ionosphere.
What two factors determine sky wave propagation between two points?
The ionospheric layer acts as a reflector for the frequency range:
In the contex of the mesosphere which of the following statements is NOT correct?
Which atmosphere layer contains ions and helps in wireless communication?
At what height the ionosphere lies above the earth surface?
What is the relationship between velocity of light and refractive index?
Is refractive index proportional to frequency?
What is the formula for refractive index?
What is the refractive index of the ionosphere?
What distance does sky wave propagate?
What is maximum usable frequency in sky wave propagation?
What are the factors that cause attenuation in ground wave?
What is the lowest layer of ionosphere?
What is the frequency range of signals that propagate best by ionospheric refraction?
The electron density of the ionosphere is . Calculate the critical frequency of radio waves in sky wave propagation.
