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What is the best analysis tool for this? I'm using varactors for the caps in a combline filter. I want to determine the level of two tone intermods due to the varactor nonlinearity. My experience in the past says Spice allows for two tones and can do frequency plots but doesn't work well with transmission lines. Is Harmonic Balance the best tool

  VNA is an N5247A. Firmware  A.10.49.08   What the best way to display phase angles, with good resolution (say 1 deg/division), where the phase angles are wrapping around at close to +/- 180 deg?   By way of example, I attach a screen shot, where I'm trying to determine the delay of an offset short. (This is actually from a