FSK_OSCILLATOR_FOR_EKG_RELAY

Published:2009/7/3 2:49:00 Author:May | From:SeekIC

Used in satellite system for relaying electrocardiograms in digital form. Input consists of 8-bit words obtained in serial form from universal asynchronous receiver-transmitter. Uses 8038 function generator that is switched between two adjustable trimmer resistors giving independently ad justable discrete audio frequencies for mark and space. Output is phase-coherent even though switching does not necessarily take place at zero-crossing points of sine wave. 0peration is much like that of FSK RTTY.-D. Nelson, Medical Lbata Relay via Oscar Satellite, Ham Radio, April 1977, p 67-73.



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