> Are you sure about 2.5 ms? Yes. > As far as I remember I measured my K3 > to about 5 ms and Elecraft also stated 5 ms. This was over a year > ago... Measure it again. The rise time changed roughly around the F/W 3.00 revision. I went back to a 2.xx version and it measured ~ 6 msec. Paul, W9AC