[Elecraft] K3 cw rise time

[Jim Brown]

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