1.

In a double side-band (DSB) full carrier AM transmission system, if the modulation index is doubled, then the ratio of total sideband power to the carrier power increases by afactor of .............

Answer»

factor of 4

The AM system is Double side band (DSB) with full carrier. The expression for total power in such modulation signal is

pt\(\cfrac{Ec^2}{2R}\) + \(\cfrac{\mu^2E_{c^2}}{4\,2R}\)

pt = pc\(\cfrac{\mu^2}2\) pc

pSB\(\cfrac{\mu^2}2\) pc

\(\cfrac{p_{SB}}{p_c}\) = \(\cfrac{\mu^2}2\)

Now if µ (modulation index) is doubled then PSB/PC Will be 4 times



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