Communication Systems
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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. 
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    Refractive index of ionosphere is
    • zero   
    • more than one
    • less than one
    • one
    Answer
    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
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