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220_MHz_PHASE_LOCKED

2017-01-07 09:39  
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220_MHz_PHASE_LOCKED
Fairchild 95H90 divide-by-10 counter U3 is used to divide 221.86-MHz VCO output frequency by 10. Resulting 22-MHz output of U3 is compared in phase with output of 22-MHz crystal-controlled oscillator by phase comparator U1, which is standard double-balanced mixer. Output of phase detector is passed through active low-pass filter for control of VCO. Article gives filter and VCO circuits. U2 is 5-V voltage regulator for 95H90.-H.Olson, Frequency Synthesizer for 220 MHz, Ham Radio, Dec. 1974, p 8-14.