300_MHz_PRESCALER

Published:2009/7/6 1:50:00 Author:May | From:SeekIC

Uses Fairchild 95H90 IC to divide input signal frequency by factor of 10 up to 320 MHz. Full-wave diode limiter at input prevents damage to IC. RA is chosen to bias IC at point of maximum sensitivity; typical value is 680 ohms. Transistor amplifier provides 2-3 V P-P output. Bias resistor RB is set to make collector-base voltage 3 V; typical value is 620 ohms. Wind one lead of 4.7-ptH choke around nail 4 times, then remove nail and slip ferrite bead over end of wire before connecting it to pin 1. Keep all leads as short as possible. Article covers construction and alignment in detail.-I. Math, Math's Notes, CQ, May 1975, p 42-44 and 64.



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