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FM Demodulator - 455KHz |
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| Free-running frequency of VCO:
fo=1.2/4 (R1) (C1) lock range f1=±8fo/Vcc capture range fc=±1/2 P sqrt(2 P FL/r) where r=(3600) (C2) Useful for NBFM reception on older shortwave receivers lacking this capability, this circuit uses a PLL IC, an N565N, to achieve this. It was originally used with an old Hammarlund HQ-170 receiver, for both 6-and 10-m FM reception. |
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