Question:
The frequency of an FM transmitter without signal input is:
The frequency of an FM transmitter without signal input is:
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The carrier frequency remains constant in an FM transmitter until it is modulated by an input signal.
Updated On: Apr 28, 2026
- The frequency of operation
- The carrier frequency
- The modulated frequency
- None of the above
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The Correct Option is B
Solution and Explanation
The question asks about the frequency of an FM transmitter when there is no signal input. To understand this, let's explore some foundational aspects of frequency modulation (FM) in radio communications.
In FM transmission, the frequency of the carrier wave is varied by the input signal. However, when the input signal is absent, the transmitter operates at its unmodulated state. Here are the definitions to aid your understanding:
- Carrier Frequency: This is the frequency at which a transmitter operates when there is no modulation signal applied. It essentially sets the base frequency for transmission.
- Frequency of Operation: Generally refers to the actual RF frequency used by the transmitter, which in the absence of modulation, is the carrier frequency.
- Modulated Frequency: This is the frequency of the carrier wave when it has been modified or 'modulated' by the input signal. In absence of the input, modulation does not occur.
Based on these definitions, when there is no signal input, the transmitter emits a constant frequency, which is the Carrier Frequency.
Therefore, the answer is: The carrier frequency.
Explanation: In the absence of any input signal, frequency modulation does not take place, and the FM transmitter will operate solely at its assigned carrier frequency.
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