25_kHz_CALIBRATOR

Published:2009/7/21 1:36:00 Author:Jessie | From:SeekIC

Addition of one 7473 dual JK flip-flop IC to circuit of Radio Shack 28-140 100-kHz calibrator kit provides conversion to 25 kHz for checking frequency settings of am-ateur receivers. Amplitude of output is 5 V P-P square wave with rich harmonic content. Originally designed for use with HW-8 Heathkit am ateur receiver. Output of calibrator is coupled to receive side of antenna relay through 10-pF capacitor. Article covers initial calibration.-D. Karpiej, A 25-kHz Calibrator for the HW-8, QST, Oct. 1978, p 20-21.



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