UPDATE_TO_100_MHz

Published:2009/7/6 2:16:00 Author:May | From:SeekIC

Simple counter stage can be added to input of existing frequency counter to extend direct counting range to 100 MHz, preparing it for use with 1-GHz prescaler.Use 74S196 presettable decade counter and 74S00 NAND-gate IC. If existing counter has positive reset pulse, connect C to CC and D to DD; if reset pulse is negative, connect C to D. If count enable pulse is negative, connect A to AA and B to BB; if positive, connect A to B. Power supply bypass capacitor should be shunted by 47-μF 10-V tantalum or electrolytic. Article covers modifications required in some counter input stages.-I. MacFarlane, How to Modify Your Frequency Counter for Direct Counting to 100 MHz, Ham Radio, Feb. 1978, p 26-29.



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