# Why is Base Band Signal Not Transmitted Directly? Give Any Two Reasons - Physics

Why is base band signal not transmitted directly? Give any two reasons

#### Solution

The baseband signal is not transmitted directly because

(i) Its higher wavelength (low frequency) will require the size of the antenna or aerial used for transmission to be very high.

(ii) For linear antenna (length l), the power radiated is proportional to (1/lambda)^2 and hence, the effective power radiated by a long wavelength baseband signal would be small.

Concept: Need for Modulation and Demodulation
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