Joe Subich, W4TV wrote: > > >> Clicks are a function of a FAST RISE TIME and DISTORTION, not >> keying speed. > >Not quite ... keyclicks are often a second derivative effect. >They occur when the rate of change of the rate of change is >high - specifically at the "corners" of the waveform (a abrupt >change in the slope coupled with high power levels). > >At one time W8JI had some scope and spectrum samples of CW >waveforms with "slow" rise/fall rates but very bad clicks. >In every case the ramp was fine but there was an abrupt change >when the ramp reached the steady state (on) condition or at >instant of transition from the steady state (on) condition to >the start of the decay phase. >
Correct - both the overall rise/fall time and absence of sharp corners are important. W9CF shows that an optimum wave shape has a gradual start, accelerating to a more rapid rise/fall through the middle part, and then slowing to a more gradual finish. The 'RC rise/decay' wave shape that was in the handbooks for many years is actually a *bad* shape because it has a very sharp corner on key-up. Another factor that can cause nasty key-clicks from a K3 is the default TX delay of 8ms. This may not be enough time for some amplifiers to change over, causing clicks due to hot-switching. This time can be increased using CONFIG / TX DLY. -- 73 from Ian GM3SEK http://www.ifwtech.co.uk/g3sek ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:Elecraft@mailman.qth.net This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html
