Need for modulation for transmission of signal:
- Size of antenna would be very large and therefore, impracticable in the absence of modulation.
If we were to transmit information say, sound, without modulation, we see that wavelength for highest frequency would be
- Effective power radiated by the antenna would be small.
Effective radiated power
- Mixing up of the base band signals from different transmitters will occur if no modulation is adopted. This will lead to loss of intelligent information.