PLL_CODE_REGENERATOR

Published:2009/7/11 3:13:00 Author:May | From:SeekIC

Permits comfortable listening to CW signals deeply embedded in noise, hash, and interference, by detecting one particular CW transmission and keying independent oscillator with its signal. Consists of signal amplifier Q1, narrow-band PLL frequency detector and trigger U1, PLL function generator U2, gate Q2, and AF output amplifier U3. In absence of triggering signal, output pin 8 of U1 presents high impedance to ground. With trig-gering frequency, output presents low impedance to ground. Oscillator U2 is gated by un through Q2.-C. R. Lewartand R. S. Libenschek, CW Regenerator for Interference-Free Communications, Ham Radio, April 1974, p 54-56.



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