STABLE_ENCODER

Published:2009/7/14 6:15:00 Author:May | From:SeekIC

All tones are frequency-synthesized and held within tolerance of 0.2% by using Motorola MC14410P CMOS tone-en-coder chip which is digital synthesizer requiring only 1-MHz reference crystal and nine other external parts. Circuit is redesign of Heath Mi-coder for triggering autopatch of repeater during mobile operation. Operates from 9-V battery. Audio output matches input for low-impedance microphone. For higher output, increase R3 and R4.-G. K. Fallenbeck, Mycoder, QST, April 1978, p 27-29.



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