I 99% understand how FM works but theres one thing I've never understood. See img 1: No audio is on it so it's not deviating at all, but my question is why does the 19khz pilot not deviate the signal? Even if I inject a 1hz (yes, 1hz) signal into the transmitter, the carrier starts to deviate (a bit). See img 2: So my question is what makes a 1hz signal deviate the signal but not a 19khz signal?

Here is graph of 19KHz dev. (at 10 and 100 percent). Everything is there

g33ky wrote:I 99% understand how FM works but theres one thing I've never understood. See img 1:

img1.PNG

No audio is on it so it's not deviating at all, but my question is why does the 19khz pilot not deviate the signal? Even if I inject a 1hz (yes, 1hz) signal into the transmitter, the carrier starts to deviate (a bit). See img 2:

img2.PNG

So my question is what makes a 1hz signal deviate the signal but not a 19khz signal?

I don't think 1hz is enough. but as micro said it would be around 9.5 to 10hz.

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