David Pratt wrote:
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?
As I understand it, Wayne called for the modification earlier, but for
some reason it didn't get reflected in production. That's why the
schematic doesn't agree.
The old value was 1 uf and it the new, correct value is 0.1 uf.
--
73,
Vic, K2VCO
Fresno CA
http://www.qsl.net/k2vco
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