[Elecraft] K2 Fast QSK

[Dave Gingrich K9DC]

On Tue, 20 May 2003, Don Rasmussen wrote:

> Hi Guys,
> 
> The K2 QSK seems to work up until 16 WPM with K2
> #3312. That is the highest speed where the receiver
> does not mute in between dashes when sending the
> number zero. I'd like to improve on this.  
> 
> Gary S. suggested:
> 
> You can try shortening the t-r delay muting by
> reducing R17 in the Q6, Q7 mute circuit from 3.3M to
> something smaller. Try tacking another resistor of
> 3.3M across the existing R17 for example. If the delay
> becomes too short, then you'll hear too much of a t-r
> transition "pop" and you'll have to use a larger
> value. Use a 0.00 t-r setting.
> 
> Has anyone else tried this, and come up with an
> optimal value that I might use as a starting point?


I tried reducing it to 470k, but it popped rather severly. I did not have 
an 820k so I ended up using 1 meg. Significant improvement in speed.

-Dave K9DC