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Vector network analysis question
hi guys,
After an hour or more of pushing and twiddling various buttons and knobs on my VNA I have at least established two standards: I connect a short and the (polar) spot flys off to the extreme left-hand-side and sits stably on the central horizontal axis. I then remove the short and replace it with an open and the spot jumps across 180 degrees to the extreme right-hand side on the same plane. All well and good so far. Next, I replace the open with a lab-grade 50 ohm termination and I wind up with an arc on the outermost circle of the polar chart at about two-thirds of the way round the circumference (clockwise) from "12 o'clock" as opposed to a spot in the dead center of the display as I would expect. What have I done wrong? I have checked this with 3 different 50 ohm loads and they all show an arc at the 'south west' corner of the chart. What's goin' on here, guys?? confused Paul |
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