Modulation in radio communications is used to?

Modulation in radio communications is used to?

• A. To alter the characteristics of a carrier wave to convey information.
• B. To increase the oscillator frequency indefinitely.
• C. To minimize the antenna size.
• D. To remove the carrier completely.

Answer: (A)

Modulation is about embedding information into a carrier wave by varying one or more of its properties—amplitude, frequency, or phase. The carrier by itself is just a steady tone; by changing its characteristics in step with the information signal, that information can be transmitted through the air and later recovered. This is exactly what the option states: altering the carrier to convey information. The other ideas don’t capture the main purpose—simply cranking up the oscillator frequency isn’t how modulation serves communications, antenna size relates to propagation, and removing the carrier is only a special case in some systems, not the general goal of modulation.

Modulation is about embedding information into a carrier wave by varying one or more of its properties—amplitude, frequency, or phase. The carrier by itself is just a steady tone; by changing its characteristics in step with the information signal, that information can be transmitted through the air and later recovered. This is exactly what the option states: altering the carrier to convey information. The other ideas don’t capture the main purpose—simply cranking up the oscillator frequency isn’t how modulation serves communications, antenna size relates to propagation, and removing the carrier is only a special case in some systems, not the general goal of modulation.