Hi Tony. According to the K3 mod page, this was introduced at about s/n 280
so you're good to go.
You made me wonder why I hadn't heard of it! I have K3 #486 and I've done
almost every mod that they have come up with..
73, Carl WS7L
On Mon, Apr 12, 2021 at 11:35 AM Tony - KM0O wrote:
> Hello,
e/EKCKkV5Nowo
-larry (K8UT)
-- Original Message --
From: "Tony - KM0O"
To: elecraft@mailman.qth.net
Sent: 2021-04-12 14:34:16
Subject: [Elecraft] K3 cw rise time
Hello,
This subject came up in a recent conversation, and I had to admit that I do
not know the cw rise time of my K3.
I still think Drake 4-line had the best-sounding CW note. Has anyone
measured it?
-de John NI0K
Jim Brown wrote on 4/12/2021 1:47 PM:
On 4/12/2021 11:34 AM, Tony - KM0O wrote:
I read somewhere that the rise time was decreased in a previous firmware
issue, but I don't know if that's true.
Be
On 4/12/2021 11:34 AM, Tony - KM0O wrote:
I read somewhere that the rise time was decreased in a previous firmware
issue, but I don't know if that's true.
Beginning with the earliest K3s, all Elecraft rigs use carefully shaped
keying to minimize clicks while maximizing readability. Wayne descr
Hello,
This subject came up in a recent conversation, and I had to admit that I do
not know the cw rise time of my K3. It's s/n 444, and does not have the cw
rise time mod that elecraft sells. The firmware is the current version.
I read somewhere that the rise time was decreased in a previous fir
A cosine is shifted by 90 degrees, starting at -1 for 0 degrees,
building to +1 at 180 degrees, and dropping again to -1 at 360 degrees.
The cosine of zero is +1 and the cosine of 180 degrees is -1.
Ah, I shoud've checked my math before I hit "send." Yes, you are correct.
Lyle
_
On Sunday 30 March 2008 01:56:46 pm Lyle Johnson wrote:
> A cosine is shifted by 90 degrees, starting at -1 for 0 degrees,
> building to +1 at 180 degrees, and dropping again to -1 at 360 degrees.
The cosine of zero is +1 and the cosine of 180 degrees is -1.
Ian, G4ICV, AB2GR, K2 #4962
--
_
Terms such as "tightening up key shaping" and "soft keying" and "hard
keying" are neither used nor defined in the latest issue of the Handbook.
My 1998 issue of the ARRL Handbook discusses the relevancy of "hard keying"
on p. 15.7 and even uses that term to try and describe the effect. On the
Lyle Johnson wrote:
Let me see if I can shed a glimmer of light here.
As usual, Lyle, a very useful and clearly written tutorial. Thanks!
Bill W5WVO
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...Worse, the latest handbook Figure 9.8 states that on-off
transitions of the RF envelope should follow a sine-wave curve, so I
don't quite know what to make of "DSP-generated raised-cosine key
shaping."
Let me see if I can shed a glimmer of light here.
A sine wave, going from 0 to 360 deg
My questions about rise times, etc, was really really intended to
help me make a decision as to whether or not I wanted to incorporate the
modification that started this discussion off. Your comments in the
last paragraph make all kinds of sense and so off to the Elecraft Order
Page I go.
Terms such as "tightening up key shaping" and "soft keying" and "hard
keying" are neither used nor defined in the latest issue of the
Handbook. Worse, the latest handbook Figure 9.8 states that on-off
transitions of the RF envelope should follow a sine-wave curve, so I
don't quite know what t
Joe Subich, W4TV wrote:
Looking at the scope picture of a single Morse dit at G4AON's
site http://www.astromag.co.uk/k3/k3_envelope2.jpg indicates
the trailing edge might be a bigger contributor to potential
clicks than the leading edge of the waveform. Note the upper
right corner has a fairl
I would like to see someone please take this discussion one step
further and define the terms "hard" keying and "soft" keying, and
describe how either an operator or someone listening would be able to
discriminate between the two. My rig is #095 and I frequently contest
in the 30-34 WPM ra
may be a place to look.
73,
... Joe, W4TV
> -Original Message-
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Brian Alsop
> Sent: Sunday, March 30, 2008 11:01 AM
> Cc: elecraft@mailman.qth.net
> Subject: Re: [Elecraft] K3 CW rise time mod - Definition
>
For what it is worth, I've just completed a Fourier analysis of the
original K3 and revised K3 waveforms presented by G4AON on his website.
I was a bit concerned that the sharpening of the leading edge would
adversely affect bandwidth and possibly generate clicks.
Bottom line for the region
I would like to see someone please take this discussion one step
further and define the terms "hard" keying and "soft" keying, and describe
how either an operator or someone listening would be able to discriminate
between the two.
Gary, this topic has been covered in great detail in nearly
I would like to see someone please take this discussion one step
further and define the terms "hard" keying and "soft" keying, and
describe how either an operator or someone listening would be able to
discriminate between the two. My rig is #095 and I frequently contest
in the 30-34 WPM ran
K3 #0215 has C222 valued 1uFd.
Mike.
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