I'm used to CW rise times in th 4-7ms range. Is this 2.5ms arrived at by a different metric? Is the curve added by sigmoidal shaping somehow excluded from the measurement?
Ed / w2rf -----Original Message----- From: elecraft-boun...@mailman.qth.net <elecraft-boun...@mailman.qth.net> On Behalf Of Richard Stutsman Sent: Monday, June 8, 2020 1:31 PM To: David Gilbert <ab7e...@gmail.com> Cc: Elecraft Reflector <Elecraft@mailman.qth.net> Subject: Re: [Elecraft] CW rise time setting Yes, I would regard a 2.5 msec rise time (using appropriate sigmoid shaping) to probably be ideal, in which case I would have no desire to modify or shorten it. I'll bet it will sound even better than a Drake or a Ten-Tec! I hereby withdraw my previous request/opinion. Rick N6IET On Mon, Jun 8, 2020 at 10:27 AM David Gilbert < <mailto:ab7e...@gmail.com> ab7e...@gmail.com> wrote: > You don't need to generate clicks to have a crisp CW tone. Elecraft > uses a pretty much optimally shaped waveform (some version of a cosine > function) and if I remember correctly the rise time is only about 2.5 > msec, although I could be wrong about that last part. And while you > may be careful not to use short rise/fall times when the band is > active, in the past there have been folks on the contesting reflector > who openly admitted they purposely generate clicks by shortening the > rise/fall times to give themselves elbow room. I will always > appreciate that Elecraft doesn't give those miscreants the means to pollute the band. > > 73, > Dave AB7E > > On Mon, Jun 8, 2020 at 9:23 AM Richard Stutsman < <mailto:rast...@gmail.com> rast...@gmail.com> wrote: > >> I for one would like to have some control over the rise/fall times. >> >> You want the cleanest (narrowest) of CW signals when operating on a >> crowded band or in a contest - unless you're a rare DX station. Most >> of my operations are 22wpm rag chews on very uncrowded bands. We're >> often the only discernible signals on an entire CW band. And >> conditions are often noisy with deep QSB. Why not allow those of us >> operating in those circumstances to shorten the rise times a bit, >> which makes it easier to copy in noisy conditions, when any close-in >> clicks or thumps aren't going to bother anybody? Copying a 'soft' >> weak CW signal is like trying to read a 'crisp' signal that's an >> entire S-unit weaker, IMO. >> >> My TS-590sg let's me do that, and I love it! >> >> Will the K4 sound as good as a Drake T4C? (Just askin'.) >> >> Rick N6IET >> >> > N4ZR wrote: >> > > >> > > Will the K4 have options for setting CW rise and fall times...? >> > Hi Pete, >> > Probably not. We've always been very careful to ensure our rigs >> > have an exceptional clean, click-free CW signal. (Third-party >> > testing bears this >> > out.) Minimizing the bandwidth requires a very specific rise/fall >> > time >> and >> > a hand-crafted sigmoidal shaping function in DSP. >> > Colonel Sanders closely guards his fried chick recipe, Mrs. Fields >> > won't reveal what's in her chocolate-chip cookies, and only >> > selected firmware monks--sworn to secrecy--are privy to Elecraft's >> > keying envelope coefficients :) 73, Wayne N6KR >> ______________________________________________________________ >> Elecraft mailing list >> Home: <http://mailman.qth.net/mailman/listinfo/elecraft> http://mailman.qth.net/mailman/listinfo/elecraft >> Help: <http://mailman.qth.net/mmfaq.htm> http://mailman.qth.net/mmfaq.htm >> Post: <mailto:Elecraft@mailman.qth.net> mailto:Elecraft@mailman.qth.net >> >> This list hosted by: <http://www.qsl.net> http://www.qsl.net Please help support this >> email list: <http://www.qsl.net/donate.html> http://www.qsl.net/donate.html Message delivered to >> <mailto:ab7e...@gmail.com> ab7e...@gmail.com >> > ______________________________________________________________ Elecraft mailing list Home: <http://mailman.qth.net/mailman/listinfo/elecraft> http://mailman.qth.net/mailman/listinfo/elecraft Help: <http://mailman.qth.net/mmfaq.htm> http://mailman.qth.net/mmfaq.htm Post: <mailto:Elecraft@mailman.qth.net> mailto:Elecraft@mailman.qth.net This list hosted by: <http://www.qsl.net> http://www.qsl.net Please help support this email list: <http://www.qsl.net/donate.html> http://www.qsl.net/donate.html Message delivered to <mailto:e...@qrv.com> e...@qrv.com ______________________________________________________________ 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 Message delivered to arch...@mail-archive.com
