What is the lock range of the PLL circuit in Fig. 13.26b for R1 = 4.7 kΩ and C1 = 0.001 μF...

What is the lock range of the PLL circuit in Fig. 13.26b for R₁ = 4.7 kΩ and C₁ = 0.001 μF?

FIG. 13.26b Phase-locked loop (PLL): PLL connected as a frequency demodulator: