CODE_REGENERATOR

Published:2009/7/11 3:55:00 Author:May | From:SeekIC

Converts noisy CW output of receiver into TTL 1 s and 0s for driving automatic Morse-code printer. Clipper U1A and 800-Hz active bandpass filter U1B feed injection-locked 800-Hz phase-shift oscillator U3 (National LM7401CN or Motorola HEP-C6052P).U1 is LM1458N or MC1458P. U2 uses part of LM709CN or HEP-C6103P as matched pair of 7-V back-to-back zener diodes. Diode detector D1 has time constant of about 5 ms, which is short enough for highest Morse-code speeds. Detector feeds LM311N or MLM311P1 voltage comparator U4 which can drive TTL or DTL directly, National LM380N audio amplifier U5 allows CW signal to drive loudspeaker directly.-H. Olson, CW Regen erator/Processor, 73 Magazine, July 1976, p 80-82.



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