Question: Q. 1. (i) Which mode of wave propagation is suitable for television broadcast and satellite communication, and why ? Draw a suitable diagram depicting this mode of propagation of wave.

U] [O.D. Comptt. I, II, III 2012]

(ii) Block diagram of a receiver is shown in the figure.

(a) Identify ’ $X$ ’ and ’ $Y$ ‘.

(b) Write their functions.

[Delhi I, II, III 2013]

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Solution:

Ans. (i) The skywave propagation is suitable for television broadcast and satellite communication.

$1 / 2$

The radio waves from the transmitting antenna can reach the receiving antenna $R$ from the different layers of ionospheres as shown in figure. $1 / 2$

(Say F-layer)

(ii) (a) $X$ : IF stage

$Y$ : Amplifier

(b) The carrier frequency is changed to a lower frequency by intermediate frequency (IF) stage preceding the detection.

An amplifier increases the strength of the detected signal.

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