-
The modulation index of an AM wave is changed from 0 to 1. The transmitted power is—
-
- Unchanged
- Halved
- Doubled
- Increased by 50 per cent
- Unchanged
Correct Option: D
We know that transmitted power is given by
PT = PC (1 + μ2/ 2)
at
μ = 0, PTo = PC
at
| μ = 1, PT1 = | PC | |
| 2 |
| Increase in power = | PT1 -PT0 | × 100 |
| PT0 |
| = | 3/2Pc - Pc | × 100 |
| Pc |
= 50%
Therefore, the transmitted power is increased by 50%.
