Posted by
Edward H Russell on
Jun 08, 2020; 6:51pm
URL: http://elecraft.85.s1.nabble.com/CW-rise-time-setting-tp7661876p7661881.html
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:
[hidden email] <
[hidden email]> On
Behalf Of Richard Stutsman
Sent: Monday, June 8, 2020 1:31 PM
To: David Gilbert <
[hidden email]>
Cc: Elecraft Reflector <
[hidden email]>
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:
[hidden email]>
[hidden email]> 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:
[hidden email]>
[hidden email]> 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
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