[Elecraft] K3 cw rise time

[John Simmons]

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.
>
> Beginning with the earliest K3s, all Elecraft rigs use carefully 
> shaped keying to minimize clicks while maximizing readability. Wayne 
> describes it as a "sigmoidal" shape, describing the math function he 
> used. It's keying bandwidth as compared to other rigs can been seen here.
>
> http://k9yc.com/TXNoise.pdf  (ARRL Lab data)
>
> and here
>
> http://k9yc.com/P3_Spectrum_Measurements.pdf (My data)
>
> 73, Jim K9YC
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