To understand how an FM receiver works, it's helpful to know a bit about how FM signals are generated. With FM, the instantaneous frequency of the transmitted waveform is varied as a function of the ...

You can see on the spectrum diagram (Fig. 1) that the average visual signal is at least 24 dB below the level of the FM carrier, so the signal tends to drop out behind terrain. Fig. 1 (Image credit: ...

Amplitude-locking snatches tiny FM signals from atmospheric swampSteve Bush Radio broadcasting using FM has advantages. Firstly, FM is almost as easy to demodulate as AM, so receivers can besimple.

Placing a sheet of atom-thin graphene into a feedback circuit causes spontaneous self-oscillation that can be tuned to create frequency-modulated (FM) signals. Changyao Chen, Sunwoo Lee, Columbia ...