Communication Systems
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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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    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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