Wow, I never thought my question would spur on such a discussion! So, if I understand correctly we have three components in the transmitted CW signal that affect what we hear on our receivers: 1) The carrier and it's stability in frequency, 2) the actual keying on and off of the carrier, and 3) the shape of the leading and trailing edge of the keying.
Also, as the receive bandwidth in narrowed, the result is a "softer" sound to the keying. Our hearing may also detect the differences in the audio frequency component distribution present between the dots and dashes themselves. In other words, dots may sound harder than dashes. So, assuming that the above transmit parameters are nominal for the amateur service, can the IF and AF filters in the receiver be adjusted to enhance or reduce the effects of the shape of the keying waveform? As stated above, the width of the bandwidth determines the softness, but what about shifting the bandwidth above or below the carrier beatnote? What about changing the slope or flatness of the bandwidth? I've always set my K2 filters so that the carrier beatnote is in the center of the the bandpass. If the bandpass is offset so that the carrier beatnote is at either the high or low end of the bandpass, yet still within the flat part of the bandwidth, what will be the effect on the way we hear the CW? Will we hear a harder note for the same bandwidth? Darrell VA7TO K2#5093 On September 19, 2006 03:07 pm, Darrell Bellerive wrote: > What is meant by "the fundamental keying waveform"? -- 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
