With K3S/KPA500 PWR knob set to 100W (out on KPA500) I'll see SWR 1.00 on the P3TXMON (rATU at the antenna base tuned) but the PEP displayed might vary markedly from WSJT-X FT8 15sec cycle to cycle of TX from 49W, 13W, 66W, 28W, ... What's going on? Bret/N4SRN -- Sent from: http://elecraft.365791.n2.nabble.com/