i need help here! I am designing a FM demodulator of f0=5MHz, Fm=1KHz and Δf =10KHz using the IC of NE564. But i need to increase the frequency deviation (Δf),
How should i do to increase it? Can i change the capacitors for the loop filter (LPF) ?
the pdf mentions that i can use Δf 1% or higher of the input signal, but the most i can increase the Δf is only up to 15KHz, after that noise occurs.
This PLL circuit can be easily used to demodulate FM signal with deviations in the range of several MHz; no setup here.
Deviation has to be determined at the modulator end by adjusting the level of the signal that will be Frequency Modulated (kHz or MHz / Volt)..