I am using a KAT500 to control my station's antenna switching. Tonight when I used a tube transceiver and amplifier, I would get a FAULT about every 5-10 minutes. Power was 650w. Here are the KAT500's parameters: f=7032, VSWR 1.13, BYPASS VSWR 1.8, TUNE STATE 0 9 20 1.13, fm 1.67. Any idea what is going on? Thanks and 73, Eric WD6DBM