Dave, You should _never_ key the K3s at 5w (or 50w)! It can disrupt the TX GAIN settings and create huge power spikes, which can be a real problem if you use an amplifier. Just use 6w or 4w or 5.5w, etc. You can confirm this with Elecraft, who will tell you the same thing. Check previous threads; it has been discussed before. 73, Jim W6YA