[Elecraft] key dot weight

[w9cf]

Poul Erik Karlshøj (PKA) wrote:
> 
> Thanks Don and others for referring me to the CW bandwidth mod (wave shape
> mod).
> It shows the fine waveform of the K2. Mine is ser. 4662 and has that mod.
> I am by no means complaining about the waveshape - it is superb. I am only
> complaining a little bit about the inability to reach 50% weight. It is
> quite close and maybe acceptable to most operators and for me it is only a
> problem at QRQ.
> 
> I have asked many times, but nobody has yet answered my simple question of
> what the minimum weight should be (when set to 0,9).
> 
> 73, Paul OZ4UN
> 

Paul,
I don't know exactly how the weight is defined for a shaped wave form.
So to answer your question for my K2, I put the wave form from my K2
serial number 5235 when set at 40 wpm and weight 0.90 and at 1.10 in
the files:
http://fermi.la.asu.edu/w9cf/k2/40wpm_090wt.jpg
and
http://fermi.la.asu.edu/w9cf/k2/40wpm_110wt.jpg
40 wpm should take 60 milliseconds between dots.  You can see that,
at the default weight of 1.10, it takes something like 67 milliseconds
between dots and is quite heavy.  At 0.90 the time between dots is about
60 milliseconds, but it looks to me to be a weight of at least 1.0 and
probably more.

I recorded these with my K2 set at minimum power into a dummy load, and
used a separate receiver to the sound card on my laptop (the receiver
was my ATS-4a which has no AGC).

I hope this helps.

73 Kevin w9cf


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