[Elecraft] CW rise time mod

David Pratt david at g4dmp.co.uk
Sat Mar 29 15:03:54 EST 2008


Elecraft says.....
"Some owners prefer a faster CW keying waveform rise time. The rise time 
can be reduced from about 8 milliseconds to 5 milliseconds without 
affecting the fall time by replacing capacitor C222 on the K3 main RF 
board with a 0.1 uF capacitor. This change will also allow a future 
firmware revision to further reduce rise time via a menu entry."

But the schematics of the RF Board Rev. A4 (Sheet 3 of 4), dated 
9/19/07, show C222 as being 0.1 already.  The instructions recommend 
removing the existing 0.1 and replacing it with another 0.1 !!  Surely 
to reduce the rise time the existing capacitor should be shunted with 
another one.

Or do Rev A RF boards have a lower value for C222 than that shown on the 
schematic?

73
-- 
David G4DMP
Leeds, England, UK




More information about the Elecraft mailing list