[Elecraft] Re: Updated Version of Elecraft Keying Mod

[Wayne Burdick]

This is definitely correct, John, based on my detailed before/after measurements
of several K2s. Thanks for your theoretical analysis.

73,
Wayne


"John, KI6WX" wrote:
> 
> If the edges are causing the key clicks and the rising edge is the problem
> with the K2, then we would expect that the second derivative of the keying
> envelope would show a larger peak at the beginning of the rising edge than
> at the beginning of the falling edge.  The opposite is true.  The second
> derivative at the beginning of the falling edge is 23% larger than at the
> beginning of the rising edge.
> 
> So we have a falltime that is 50% faster than the risetime, and we have a
> change at the beginning of the falltime that is 23% larger than the change
> at the beginning of the risetime.  From this, I would conclude that the
> trailing edge of the original K2 keying waveform is the primary source of
> the key clicks.
> -John
>  KI6WX
> 

> > It was NOT the rise time. It was the leading edges, the sharp little
> > edge or corner at the BEGINNING of the rise time, and the BEGINNING of
> > the fall time, that were causing the clicks.
> >
> > The problem was with the SHAPE of the rise time, not the amount or
> > length of rise time....

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