Question

Explain the concept of modulation and its need in long distance communication.

Answer 1

Modulation is that ,the message signal in its original form cannot be transmitted through the channel as it will get distorted therefore we superimpose our message signal over a carrier having high frequency, energy and amplitude.It is like a helper to the Original signal.The original signal is much weaker initially,but since it is mixed with carrier signal,together they form modulated signal.

Any particular signal has two criteria upon with signal quality and range depends upon.If anyone of the both at a time is adjusted,it would be modulated over a long distance on mixing upon carrier signal.