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PASSIVE_CW_FILTER

2017-02-27 01:27  
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PASSIVE_CW_FILTER
Uses inexpensive 88-mH toroids to give very sharp 35-Hz bandwidth at 3 dB down. Filter has high insertion loss. Keyed waveshape has slow rise and fall, so CW signals have pronounced ringing that may be objec-tionable.-A. F. Stahler, An Experimental Com-parison of CW Audio Filters, 73 Magazine, July 1973, p 65-70.