"Ever since I received my KPA1500 (SN 00178), I've observed that the ATU sometimes won't achieve a match better than about 1.4:1, even though the antenna SWR is well within range." What is the SWR stop threshold set to. It's controlled by serial command (^STS) and I assume that, like the KAT500, the value(s) can be set with the utility. Andy, k3wyc