Home › Forums › Bug Reports › Markers while using a Smith Chart This topic has 3 replies, 4 voices, and was last updated 2 years, 4 months ago by dom. Viewing 4 posts - 1 through 4 (of 4 total) Author Posts 3. September 2020 at 13:58 #579 MiOhParticipant The markers when using a Smith chart are showing polar coordinates, not the actual S-parameter. The center of Smith Chart is 1 ohm (if normalized) or 50 ohms if using 50 ohm ports (not normalized. The left side is 0 ohms and the right side is infinity. When using the markers, the center shows zero, the left shows minus one and the right shows plus one. These are normalized polar coordinates. MiOh 16. February 2021 at 12:23 #746 wb6yazParticipant Plotting s-parameter data with a table also shows this error when using real / imaginary setting. 29. March 2021 at 10:54 #843 QucsStudioKeymaster The data in the smith chart is correct. Of course, the markers show the values of the s-parameters and not the corresponding impedances. Therefore the numbers. Please use the function rtoz(…) to transform reflection coefficient (e.g. S11) to impedance. 21. July 2021 at 18:14 #1009 domParticipant I also stumbled on this in the past and found it rather surprising. Would it be possible to add a checkbox in the graph properties or something similar to display impedances instead of coordinates? I didn’t even know the rtoz function existed… Author Posts Viewing 4 posts - 1 through 4 (of 4 total) You must be logged in to reply to this topic.