Re: KX2 versus K3 Keyer Speed

Posted by John Oppenheimer on Aug 11, 2017; 6:22pm
URL: http://elecraft.85.s1.nabble.com/KX2-versus-K3-Keyer-Speed-tp7633240p7633259.html

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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