UPWARD_SHIFT_RTTY_DEMODULATOR

Published:2009/7/15 2:21:00 Author:Jessie | From:SeekIC

PLL demodulator serves for copying AFSK/FSK up-ward-shift RTTY signals, 2N706 switches 2N5655 on and off, reversing polarity of voltage from LM741 comparator on mark/hold as needed for smooth upward-shift copy. Works equally well on wide-shift or narrow-shift signals. Zero-center tuning meter will show full-scale minus (left) reading on mark/hold signal Meter may not be needed on AFSK.-N. Stinnette, Update of the Phase-Locked Loop RTTY Demodulator, Ham Radio, Aug. 1976, p 16-17.



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