2_MHz_STANDARD_WITH_DIVIDERS

Published:2009/7/21 20:39:00 Author:Jessie | From:SeekIC

Can be used for calibration of frequency meters, frequency counters, and amateur receivers. Two crystal oscillators (2 MHz and 100 kHz) feed two 7490 decade counters through isolation amplifier. Arrangement gives frequency division by 2, 4, 10, 20, and 100 for each oscillator, with all frequencies rich in harmonics and usable through 144 MHz. Counter reset gates at pins 2, 3, 6, and 7 and ground at pin 10 must be connected to common terminal for all modes of operation, Supply should not exceed 5.5 V.-J. M. Janicke, A Wide-Range Crystal-Controlled Frequency Standard, QST, July 1976, p 27-28.



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