I’ve read through: [https://en.wikipedia.org/wiki/Frequency_modulation](https://en.wikipedia.org/wiki/Frequency_modulation), to no avail, perhaps I am stuck. Wouldn’t adjusting the frequency through phase and frequency modulation change the frequency of the radio receiving itself?
I understand that radio crystals osciallate at frequency and then we have have amps/transducers. Amplitude modulation makes sense, we turn up this part or that part of the signal. But FM I don’t understand how we can *modulate* without breaking that which allows the radio to receive in the first place. Is it an overtone series? Let’s say I was listening to 91.5 FM, am I also listening to the octave above, so 193 FM?
In: Engineering
No, you’d be listening to a range of frequencies that (IIRC) goes from 91.425 up to 91.575 megahertz. The carrier, when you’re transmitting silence, is at 91.5 but the sound signal causes it to speed up or slow down.
The receiver is able to handle that because they aren’t restricted to picking up just one frequency at a time; with bandpass filters they can grab a range of frequencies and pass them all along to a speaker at the same time.
Do you have a graphing calculator? If so, I can give you something to graph that has a small chance of helping.
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