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    Refractive index of ionosphere is
    • zero   
    • more than one
    • less than one
    • one

    C.

    less than one
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    What is space wave propagation?

    The mode of wave propagation in which the radio waves emitted from the transmitter antenna reach the receiving antenna through space in a straight line is known as space wave propagation. Space waves are the radio waves of frequency-range from 54 MHz to 4.2 GHz. 
    Space wave propagation is used in line of sight communication and satelite communication.
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    What is sky wave propagation?
    Sky wave propagation is a mode of wave propagation in which the radiowaves emitted from the transmitter antenna reach the receiving antenna after reflection by the ionosphere.

    In sky wave propagation, the frequency of radio waves range from 1710 kHz to 40 MHz. 

    This mode of propagation is uded by short wave broadcast service. 
    653 Views
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    What is the meaning of the term 'attenuation' in communication system?
    Attenuation is refererred to as the reduction in the strength of a signal while propagating through a medium. Attenuation is possible for both digital and analog signals as a result of long distance transmission.
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    Given alongside is the circuit diagram of an AM demodulator. For good demodulation of AM signal of carrier frequency f, the value of RC should be
    • RC = 1/f
    • RC < 1/f
    • RC ≥ 1/f
    • RC >> 1/f

    D.

    RC >> 1/f
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