Question
What is deviation ratio?
Answer Options
- A) The ratio of the audio modulating frequency to the center carrier frequency
- B) The ratio of the maximum carrier frequency deviation to the highest audio modulating frequency
- C) The ratio of the carrier center frequency to the audio modulating frequency
- D) The ratio of the highest audio modulating frequency to the average audio modulating frequency
Correct Answer: B
Explanation
The deviation ratio is a technical parameter used specifically for Frequency Modulation (\text{FM}) systems. Although calculated identically to the modulation index, the deviation ratio refers to system specifications: the maximum deviation allowed by the hardware, and the maximum audio frequency the system can process.
Deviation ratio is defined as the ratio of the maximum carrier frequency deviation (\Delta f_{max}) to the highest audio modulating frequency (f_{m, max}). This ratio is used by regulators and designers to establish a standardized maximum bandwidth for the \text{FM} system, ensuring that all transmitters in a specific service (like amateur \text{FM} or broadcast \text{FM}) adhere to consistent bandwidth limits.
This topic was automatically created to facilitate community discussion about this exam question. Feel free to share study tips, memory tricks, or additional explanations!