Re: [Elecraft] CW rise time setting

ft@mailman.qth.net> > Cc: E.H. Russell mailto:e...@qrv.com> > Subject: Re: [Elecraft] CW rise time setting On Mon, Jun 8, 2020 at 12:31 PM E.H. Russell mailto:e...@qrv.com> > wrote: I suppose shaping of the curve corners removes harmonics introduced by the abrupt transitio

[Elecraft] CW rise time setting

"Most folks assume there will be no delay between KEY closure and KEY OUT closure, but there is an extra delay (of about 5 ms, minimum) in the K3S." I suppose I'm not in the "most folks" group. I measured this delay when investigating the keying characterisitcs of my Kenwood TS-590S. Key down

Re: [Elecraft] CW rise time setting

nteresting to see how the new radio CW looks in time and > frequency domains. Also how the turnaround latency is managed. > > > > Tks, > > 73 Ed w2rf > > > > > > > > *From:* Bob Wilson, N6TV > *Sent:* Thursday, June 11, 2020 2:05 PM > *To:* Elecraft Re

Re: [Elecraft] CW rise time setting

the turnaround latency is managed. Tks, 73 Ed w2rf From: Bob Wilson, N6TV Sent: Thursday, June 11, 2020 2:05 PM To: Elecraft Reflector Cc: E.H. Russell Subject: Re: [Elecraft] CW rise time setting On Mon, Jun 8, 2020 at 12:31 PM E.H. Russell mailto:e...@qrv.com> > wro

Re: [Elecraft] CW rise time setting

On Mon, Jun 8, 2020 at 12:31 PM E.H. Russell wrote: > I suppose shaping of the curve corners removes harmonics introduced by the > abrupt transitions, allowing an accelerated ramp inbetween. But does this > really reduce the total rise time to 2.5ms? It seems that the softening > process must tak

Re: [Elecraft] CW rise time setting

: Tuesday, June 9, 2020 3:46 PM To: elecraft@mailman.qth.net Subject: Re: [Elecraft] CW rise time setting On 6/9/2020 11:07 AM, Al Lorona wrote: > The reduction in the sideband levels (what some folks here called 'clicks'... > not sure that's a good name for this) varies d

Re: [Elecraft] CW rise time setting

I used: 1/(1+exp(-x)) where x = the pulse train. I then modulated a 7 MHz carrier with the result (although the results don't care what the RF frequency is, of course). Al  W6LX >>>Which sigmoid function did you model, Al? __ Elecra

Re: [Elecraft] CW rise time setting

On 6/9/2020 11:07 AM, Al Lorona wrote: The reduction in the sideband levels (what some folks here called 'clicks'... not sure that's a good name for this) varies depending on where you measure it, but in general the sidebands will drop anywhere from 0 to 12 dB-- sometimes less, sometimes more-

Re: [Elecraft] CW rise time setting

Which sigmoid function did you model, Al? 73, Fred ["Skip"] K6DGW Sparks NV DM09dn Washoe County On 6/9/2020 11:07 AM, Al Lorona wrote: I used to think that the rise and fall times of the CW pulse didn't really matter much to the sideband levels; I believed that it was more a function of the

Re: [Elecraft] CW rise time setting

I used to think that the rise and fall times of the CW pulse didn't really matter much to the sideband levels; I believed that it was more a function of the waveshaping, especially at the corners of the pulse. But I just ran a quick simulation of a pulse train going through both a raised cosine

Re: [Elecraft] CW rise time setting

ublished out there? >>> >>> >>> >>> Ed / w2rf >>> >>> >>> >>> >>> >>> >>> >>> From: Alan Bloom >>> Sent: Monday, June 8, 2020 3:15 PM >>> To: E.H. Russell &g

Re: [Elecraft] CW rise time setting

PM To: E.H. Russell Cc: 'Elecraft Reflector' Subject: Re: [Elecraft] CW rise time setting In the "good old days" key shaping was done simply by adding a capacitor to the key line or equivalent. That results in an exponential rise and/or fall time, which is not optimum, s

Re: [Elecraft] CW rise time setting

ay, June 8, 2020 3:15 PM > To: E.H. Russell > Cc: 'Elecraft Reflector' > Subject: Re: [Elecraft] CW rise time setting > > > > In the "good old days" key shaping was done simply by adding a capacitor to > the key line or equivalent. That results in an expon

Re: [Elecraft] CW rise time setting

radios. Anything published out there? Ed / w2rf From: Alan Bloom Sent: Monday, June 8, 2020 3:15 PM To: E.H. Russell Cc: 'Elecraft Reflector' Subject: Re: [Elecraft] CW rise time setting In the "good old days" key shaping was done simply by adding a capaci

Re: [Elecraft] CW rise time setting

t; Behalf Of Richard Stutsman > Sent: Monday, June 8, 2020 1:31 PM > To: David Gilbert > Cc: Elecraft Reflector > 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 w

Re: [Elecraft] CW rise time setting

Sent: Monday, June 8, 2020 1:31 PM To: David Gilbert Cc: Elecraft Reflector 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 b

Re: [Elecraft] CW rise time setting

On 6/8/2020 9:21 AM, Richard Stutsman 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 u

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,

Re: [Elecraft] CW rise time setting

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 t

Re: [Elecraft] CW rise time setting

Glad to hear that we can count on the K4 maintaining the excellent CW characteristics.  I frequently will look at signals I am receiving measuring the transmitted waveform based on what I see on the P3 and it never ceases to amaze me about how different brands can be identified based on the wav

[Elecraft] CW rise time setting

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 discernibl

Re: [Elecraft] CW rise time setting

Good! 73, Pete N4ZR Check out the Reverse Beacon Network at , now spotting RTTY activity worldwide. For spots, please use your favorite "retail" DX cluster. On 6/7/2020 9:45 PM, Wayne Burdick wrote: N4ZR wrote: Will the K4 have options for setting CW rise and fall tim

Re: [Elecraft] CW rise time setting

Thank you. I'd be really disappointed if the keying waveform for the K4 was made adjustable. I consider the fact that it is not adjustable on my K3 to be one of its best features. On Sun, Jun 7, 2020 at 6:49 PM Wayne Burdick wrote: > > N4ZR wrote: > > > > Will the K4 have options for setting C

Re: [Elecraft] CW rise time setting

Thanks Wayne for the excellent and exceptional clean keying. 73 Bob, K4TAX Sent from my iPhone > On Jun 7, 2020, at 8:49 PM, Wayne Burdick wrote: > >  >> >> N4ZR wrote: >> >> Will the K4 have options for setting CW rise and fall times...? > > Hi Pete, > > Probably not. We've always bee

Re: [Elecraft] CW rise time setting

> 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 ri

Re: [Elecraft] CW rise time setting

I really hope the answer is "No."  Rise/Fall times and waveshape of the RF envelope should be tailored by the mfr for the best signal, not adjustable. 73, Fred ["Skip"] K6DGW Sparks NV DM09dn Washoe County On 6/7/2020 6:35 PM, N4ZR wrote: Will the K4 have options for setting CW rise and fall t

[Elecraft] CW rise time setting

Will the K4 have options for setting CW rise and fall times, not just TXDELAY like the K3? -- 73, Pete N4ZR Check out the Reverse Beacon Network at , now spotting RTTY activity worldwide. For spots, please use your favorite "retail" DX cluster.