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When the modulating frequency is doubled, the modulation index is halved, and the modulating voltage remains constant. The modulation system is—
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- Amplitude modulation
- Phase modulation
- Frequency modulation
- Any one of the three
- Amplitude modulation
Correct Option: C
When the modulating frequency is doubled, the modulation index is halved, and the modulating voltage remains constant. The modulation system is frequency modulation because
| β = | KfAm |
| fm |
| β ∝ | 1 |
| fm |
