On Thu, Jan 30, 2025 at 11:38 AM Muhammad Anas <anasg8...@gmail.com> wrote:
> Dear GNU Radio Community, > > I am attempting to demodulate an AM signal with a carrier frequency of 90 > MHz and a message signal frequency of 90 Hz. The sampling rate is 1 MS/s. > I am utilizing a PLL carrier tracking, but I require clarification > regarding the appropriate configuration of its parameters. Specifically, I > am unsure how to determine the "center frequency" and "frequency variations > to track" parameters, expressed in radians per sample, as detailed in the > GNU Radio PLL carrier tracking tutorial. Could you please provide guidance > on calculating these parameters for my specific signal characteristics? > The neat thing about AM is that there is no information stored in the phase of the signal - it's all in the amplitude. You shouldn't have to do any carrier tracking and you should just be able to look at the envelope (complex magnitude) of the signal for your information. Filtering, on the other hand, is absolutely required. Be sure to filter your signals before demodulation. Good luck. Brian
