[Elecraft] KX2 versus K3 Keyer Speed

[Phil Hystad]

John,

Thanks for the comments below.  I actually thought of putting this on my oscilloscope to measure the actual timing but I was just too lazy.  Another idea I had which I may still do is to record a string of dots from the KX2 and the K3 and then use signal processing to measure the timing between dots.  I figure I can use Mathematica (Wolfram) for this.  This is what I might do when I get an afternoon free to do it — maybe in the dead of winter.

73, phil


> On Aug 11, 2017, at 11:22 AM, John Oppenheimer <john at KN5L.net> wrote:
> 
> Hi Phil,
> 
> Yes there is a little difference.
> 
> One standard for WPM can be found in:
> https://en.wikipedia.org/wiki/Morse_code
> as T = 1200 / W or WPM = 1200 / T
> Where T is dot duration in mS.
> 
> To remove weighting, using an oscilloscope to measure Dot and Space
> time. The keyer is using the micro-controller, which is doing other
> things, therefore there is a little jitter. To filter jitter out,
> oscilloscope averaging is enabled.
> 
> K3  116.0 mS (Dot+Space) = 20.7 WPM
> KX2 114.8 mS (Dot+Space) = 20.9 WPM
> 
> John KN5L
> 
> 
> On 08/11/2017 09:54 AM, Phil Hystad wrote:
>> I think I have detected a subtle difference between the keyer speed of my KX2 and my K3.  Is this possible?  How far off?  About one word per minute I think.  The KX2 being faster that is.  Thus, I run my K3 at 20 wpm as my normal speed and my KX2 at 19 wpm to obtain the same feel.  Defininately not large enough to be a bother, I am mostly just curious as to whether this is true.
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