An audio signal of frequency v₀ is to be transmitted as an electromagnetic wave
(i) directly as such
(ii) through its use as the modulating signal on a carrier wave of frequency v_c.
State the ratio of the size of the transmitting antenna, that can properly sense the time variation of the signal, in terms of v₀ and v_c.

Solution

The ratio of the size of the transmitting antenna is

= \frac{v_{c}}{v_{0}} .

where,

ν_{o}

is the frequency of tthe audio signal and

ν_{c}

is the frequency of the carrier signal.

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