Thev QUADRA does NOT like SWR over 3 to 1, and may refuse to even ATTEMPT to tune a 4 to 1 SWR. My FT-1000MP WILL TUNE a greater mismatch than my QUADRA---The QUADRA I have is an early model, and it is POSSIBLE that the newer QUADRAs might be more "SWR tolerant", but I would not bet on it.--Bob, KC3VO