VARIABLE_Q_FOR_CW

Published:2009/7/2 7:35:00 Author:May | From:SeekIC

Fixed-frequency active filter gives slowly rising and falling keyed waveform with good slope considering narrowness of bandwidth, which is 75 Hz at 3 dB down. Adjusting Q with 1K pot changes bandwidth.-A.F. Stahler, An Experimental Comparison of CW Audio Filters, 73 Magazine, July 1973, p 65-70.



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