10_Hz_CLOCK_Circuit Diagram World 
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2017-01-08 22:41  
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Stable and accurate clock is generated by high-precision 100-kHz crystal oscillator and decade divider ehain. Used in 20-meter receiver as part of digital display systemthat shows frequency of received signal aftercounting HFO,LO,and BFO outputs,summing counts, and displaying result.-M. A. Chapman, High Performance 20-Meter Receiver with Digital Frequency Readout, Ham Fladio, Nov 1977, p 56-65.