SECONDARY_STANDARD

Published:2009/7/21 20:33:00 Author:Jessie | From:SeekIC

Provides switch selected square-wave outputs of 100, 20, 10, 5, and 1 kHz, calibrated with receiver tuned to WWV frequency. 100-kHz clock signal is generated by crystal oscillator IC1. Half of IC2 is buffer between oscillator and first decade counter IC3, used to generate 10- and 20-kHz outputs. Sec-ond decade counter IC4 gives 1 and 5 kHz.-E.R. Spadoni, A Versatile Secondary Frequency Standard, CQ, Sept. 1975, p 31-32.



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