DOT_GENERATOR

Published:2009/7/5 22:07:00 Author:May | From:SeekIC

Can be used by amateur radio operator to talk himself onto frequency while Iistening on downlink passband of Oscar satellite, without causing interference to other stations using satellite. Generates audio dots at rate of 12 per second. Frequency of free-running MVBR Q1-Q2 is determined by values of C1, C2, R1, and R2. Emitter-follower Q3 drives 1500-Hz audio oscillator Q4. C1 and C2 are 1-μF 16-V electrolytics. Q1-Q4 are 2N2222 or equivalent NPN general-purpose transistors.-M. Righini and G. Emiliani. Audio Dot Generator Eases OSCAR SSB Spotting, QST, Nov. 1977. p 45.



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