>From AC0C's site.Looks like Yaesu did a fine job improving the keying envelope with the latest firmware update.Almost as good as the K3. Throw in the class A final on the 5K and the output at the linear is likely as good or better.Great work by Jeff. http://www.ac0c.com/main/page_ft5k_cw_occupied_bandwidth.html73,Steve, W1SRD