> > In the FM receiver: Why a LPF is used instead of a BPF in order to select > the Radio channel that we want to hear? That is the only part I don't > understand. > > Hello Pablo,
Let's say you are trying to receive an FM signal centered around 100MHz. In other words, the signal of interest is from (100-delta)MHz through (100+delta)MHz. My understanding is that at the receiver, you are first demodulating the signal by multiplying the incoming signal with the carrier frequency of 100MHz. This leads to two bands: a) Centered around 0: (-delta through +delta) b) Centered around 200MHz: (200-delta) Mhz through (200+delta) MHz. Signal (a) is what you are interested in, while signal (b) needs to be eliminated. This is where the LPF comes in. Best, Aditya
_______________________________________________ Discuss-gnuradio mailing list Discuss-gnuradio@gnu.org https://lists.gnu.org/mailman/listinfo/discuss-gnuradio
