The recent thread on filter settings and hearing reminded me of a question I would like to get an answer to.
In the ARRL 2001 Handbook on page 15.7 we find: "The dots and dashes of a CW signal must start and stop abruptly enough so we can clearly distinguish the carrier's presences and absences from noise, especially when fading prevails. The keying sidebands, which sound like little more than thumps when listened to on their own, help our brains be sure when the carrier tone starts and stops. It so happens that we always need to hear one or more harmonics of the fundamental keying waveform for the code to sound sufficiently crisp." What is meant by "the fundamental keying waveform"? How do we take "the need to hear one or more harmonics of the fundamental keying waveform" into account when setting up the IF and audio filters? 73, Darrell VA7TO K2 #5093 -- Darrell Bellerive Amateur Radio Stations VA7TO and VE7CLA Grand Forks, British Columbia, Canada _______________________________________________ Elecraft mailing list Post to: Elecraft@mailman.qth.net You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
