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CW_FILTER_1

2017-02-13 10:08  
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CW_FILTER_1
Variable-bandwidth variable-frequency audio filter can be tuned to center frequency anywhere in range from 300 to 3000 Hz.Bandwidth can be as narrow as 50 Hz, which is about 3 times theoretical minimum of is Hz for 50-bit words and Morse code at 25 WPM. Performance can be improved over entire fre-quency range by using 741 opamp.-R. Skelton, Comments, Ham Radio, June 1975, p 56-57.