Comment by yetihehe
1 year ago
At my highschool, we had FM radio transmitter on the other side of street. Pretty often you could hear one of the stations in computer speakers in library, so FM radio can be detected by simple analog circuits.
1 year ago
At my highschool, we had FM radio transmitter on the other side of street. Pretty often you could hear one of the stations in computer speakers in library, so FM radio can be detected by simple analog circuits.
You need a PLL somewhere, because the audio signal is encoded in the frequency shift of the carrier (e.g. 98 MHz +/- 150 kHz).
Or maybe you were getting a leak from the audio signal before modulation, e.g. via power lines or something.