25_250_MHz_PRESCALER

Published:2009/7/6 2:08:00 Author:May | From:SeekIC

Based on use of Fairchild 95H90 decade counter, with preamp Q1 and associated components selected for 25-250 MHz range. 1N914N diodes prevent over-loading of input. Voltage regulator is LM340T-5, L1 is 8 tums No. 28 wound on body of 1000-ohm or larger 1/2-W resistor, with ends soldered to resistor leads. Quarter.wave whip antenna at inputwill pick up adequate signal from 1-W 146-MHz transceiver hand-held 6-10 feet away.Counter provides division by 10.-R. D. Shriner, Prescaler Updates the DVM/Frequency Counter, QST, Sept. 1978, p 22-24 and 37.



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