Question:
Which of the following circuits is an indirect method of generating FM?
Which of the following circuits is an indirect method of generating FM?
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Armstrong method = indirect FM generation using PM.
Updated On: Jul 2, 2026
- reactance modulator
- varactor diode modulator
- Armstrong modulator
- balanced modulator
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The Correct Option is C
Solution and Explanation
Concept:
FM generation methods:
• Direct method: reactance modulator, varactor
• Indirect method: Armstrong method
Step 1: Direct methods Frequency varied directly.
Step 2: Indirect method Phase modulation used first.
Step 3: Armstrong method Uses phase modulation to generate FM.
Step 4: Conversion PM signal converted into FM.
Step 5: Conclusion \[ \boxed{\text{Armstrong modulator}} \]
Final Answer: \[ \boxed{(C)} \]
• Direct method: reactance modulator, varactor
• Indirect method: Armstrong method
Step 1: Direct methods Frequency varied directly.
Step 2: Indirect method Phase modulation used first.
Step 3: Armstrong method Uses phase modulation to generate FM.
Step 4: Conversion PM signal converted into FM.
Step 5: Conclusion \[ \boxed{\text{Armstrong modulator}} \]
Final Answer: \[ \boxed{(C)} \]
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