Timeline for Why isn't phase modulation commonly used in radio stations?
Current License: CC BY-SA 4.0
3 events
| when toggle format | what | by | license | comment | |
|---|---|---|---|---|---|
| Apr 20, 2021 at 13:43 | comment | added | Dan Mills | Specifically, frequency is just the rate of change of phase, so an integrator or differentiator in the baseband before the modulator allows you to convert one into the other. The early crystal controlled FM transmitters (Pre PLL) used a thing called an Armstrong modulator, which was really a phase modulator that was then multiplied up to get to the required 75kHz deviation. | |
| Apr 20, 2021 at 10:27 | comment | added | Dave Tweed | The key difference is that when you decode a PM signal with an FM receiver (or vice-versa), you get a non-flat frequency response. | |
| Apr 20, 2021 at 9:42 | history | answered | jwh20 | CC BY-SA 4.0 |