Hi, David: The original value for C222 was 0.01 uF. Wayne asked that it be changed to 0.1 uFd.
I wasn't privy to the source of the comment that the rise time might be further shortened in firmware. If Wayne plans to control the keying in firmware, it's probably important that all the hardware be consistent with a 0.1uFd cap at C222 so the firmware works as planned. Ron AC7AC -----Original Message----- 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 _______________________________________________ Elecraft mailing list Post to: [email protected] You must be a subscriber to post to the list. Subscriber Info (Addr. Change, sub, unsub etc.): http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/subscribers.htm Elecraft web page: http://www.elecraft.com
