Darrell, That has ben dropped from the more recent handbook (does not appear in my 2005 edition). I am going 'out on a limb' here by saying that this stems from the concept that 'some keyclicks are good' philosophy. Sidebands on a CW signal are the result of the keying shape, and there is more to it than just the rise and fall times - there is the rounding at the corners to consider too.
I have heard many an operator state that 'hard keying' will get you through a pile-up better. While that may be true, it certainly is not 'neighborly'. I am glad to see that this statement does not appear in the more recent handbooks. 73, Don W3FPR > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of Darrell Bellerive > Sent: Tuesday, September 19, 2006 6:08 PM > To: Elecraft List > Subject: [Elecraft] Hearing CW - Fundamental Keying Waveform? > > > 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: [email protected] > 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 > > > -- > No virus found in this incoming message. > Checked by AVG Free Edition. > Version: 7.1.405 / Virus Database: 268.12.5/450 - Release Date: 9/18/2006 > > _______________________________________________ Elecraft mailing list Post to: [email protected] 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
