Which two forms of modulation are commonly used for radio communication?

Which two forms of modulation are commonly used for radio communication?

• A. AM and PM
• B. FM and FM
• C. AM and FM
• D. FM and PM

Answer: (C)

The two forms of modulation commonly used for radio communication are Amplitude Modulation (AM) and Frequency Modulation (FM). AM works by varying the amplitude of the carrier wave to encode the information, allowing it to transmit audio signals over long distances, especially in the AM broadcasting bands. FM, on the other hand, encodes information by varying the frequency of the carrier wave, which provides improved sound quality and resistance to noise compared to AM, making it ideal for FM radio broadcasts. Both AM and FM are widely applicable in various communication systems, including commercial broadcasting, aviation communications, and land mobile radio services. This versatility and reliability in transmitting audio signals contribute to their prevalence in the field of radio communications. Other forms of modulation, like Phase Modulation (PM), while used in specific applications, do not match the widespread adoption and utility of AM and FM in general radio communication.

The two forms of modulation commonly used for radio communication are Amplitude Modulation (AM) and Frequency Modulation (FM). AM works by varying the amplitude of the carrier wave to encode the information, allowing it to transmit audio signals over long distances, especially in the AM broadcasting bands. FM, on the other hand, encodes information by varying the frequency of the carrier wave, which provides improved sound quality and resistance to noise compared to AM, making it ideal for FM radio broadcasts.

Both AM and FM are widely applicable in various communication systems, including commercial broadcasting, aviation communications, and land mobile radio services. This versatility and reliability in transmitting audio signals contribute to their prevalence in the field of radio communications. Other forms of modulation, like Phase Modulation (PM), while used in specific applications, do not match the widespread adoption and utility of AM and FM in general radio communication.