payload: {"action":"created","issue":{"url":"https://api.github.com/repos/mihtjel/nanovna-saver/issues/29","repository_url":"https://api.github.com/repos/mihtjel/nanovna-saver","labels_url":"https://api.github.com/repos/mihtjel/nanovna-saver/issues/29/labels{/name}","comments_url":"https://api.github.com/repos/mihtjel/nanovna-saver/issues/29/comments","events_url":"https://api.github.com/repos/mihtjel/nanovna-saver/issues/29/events","html_url":"https://github.com/mihtjel/nanovna-saver/issues/29","id":502708040,"node_id":"MDU6SXNzdWU1MDI3MDgwNDA=","number":29,"title":"Impedance measurement ??","user":{"login":"UlrichD61","id":56156578,"node_id":"MDQ6VXNlcjU2MTU2NTc4","avatar_url":"https://avatars3.githubusercontent.com/u/56156578?v=4","gravatar_id":"","url":"https://api.github.com/users/UlrichD61","html_url":"https://github.com/UlrichD61","followers_url":"https://api.github.com/users/UlrichD61/followers","following_url":"https://api.github.com/users/UlrichD61/following{/other_user}","gists_url":"https://api.github.com/users/UlrichD61/gists{/gist_id}","starred_url":"https://api.github.com/users/UlrichD61/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/UlrichD61/subscriptions","organizations_url":"https://api.github.com/users/UlrichD61/orgs","repos_url":"https://api.github.com/users/UlrichD61/repos","events_url":"https://api.github.com/users/UlrichD61/events{/privacy}","received_events_url":"https://api.github.com/users/UlrichD61/received_events","type":"User","site_admin":false},"labels":[],"state":"open","locked":false,"assignee":null,"assignees":[],"milestone":null,"comments":1,"created_at":"2019-10-04T15:39:43Z","updated_at":"2019-10-04T16:25:03Z","closed_at":null,"author_association":"NONE","body":"**I'm facing some problems when mesuring impedances with NanoVNA.** \r\nI am using that smart little NanoVNA device primarily to measure impedances of coils, wound beads and ferrite core materials for EMC purpose. In general that seems to work pretty OK.\r\n\r\nNow I found that wonderful nanovna-saver SW here and was quite happy to run it.! Thanks for that effort !\r\n\r\nHowever there is a significant difference in the impedance values shown on the tiny Nano-LCD (CH0 Smith chart with impedance value in OHM) and on the Chart in NanoVNA-Saver (S11 +jX).\r\nOr do I have a principle misunderstanding how to interprete those values ?\r\n\r\nAanother question, is anyone aware of a NanoVNA-firmware release that shows the Impedance as a trace? It is rather timeconsuming to scribble down the impedance on various frequency points.\r\n \r\nAny help is very much appreciated !"},"comment":{"url":"https://api.github.com/repos/mihtjel/nanovna-saver/issues/comments/538467877","html_url":"https://github.com/mihtjel/nanovna-saver/issues/29#issuecomment-538467877","issue_url":"https://api.github.com/repos/mihtjel/nanovna-saver/issues/29","id":538467877,"node_id":"MDEyOklzc3VlQ29tbWVudDUzODQ2Nzg3Nw==","user":{"login":"UlrichD61","id":56156578,"node_id":"MDQ6VXNlcjU2MTU2NTc4","avatar_url":"https://avatars3.githubusercontent.com/u/56156578?v=4","gravatar_id":"","url":"https://api.github.com/users/UlrichD61","html_url":"https://github.com/UlrichD61","followers_url":"https://api.github.com/users/UlrichD61/followers","following_url":"https://api.github.com/users/UlrichD61/following{/other_user}","gists_url":"https://api.github.com/users/UlrichD61/gists{/gist_id}","starred_url":"https://api.github.com/users/UlrichD61/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/UlrichD61/subscriptions","organizations_url":"https://api.github.com/users/UlrichD61/orgs","repos_url":"https://api.github.com/users/UlrichD61/repos","events_url":"https://api.github.com/users/UlrichD61/events{/privacy}","received_events_url":"https://api.github.com/users/UlrichD61/received_events","type":"User","site_admin":false},"created_at":"2019-10-04T16:25:03Z","updated_at":"2019-10-04T16:25:03Z","author_association":"NONE","body":"Hello mihtjel, thanks for your fast response.\r\n\r\nAttached 5 pictures. \r\n3 photos of nano-vna at different frequencies (20MHz, 100MHz and 250 MHz) showing 3 impedance values.\r\n2 screenshoot from PC with markers at those frequencies.\r\n\r\nFrom PC-screen I read:\r\n~75 Ohms, ~540 Ohms and ~200 Ohms\r\n\r\nFrom Nano.vna I read\r\n149 Ohms, 253 Ohms, 544 Ohms \r\n\r\nAm I doing something odd here ?\r\n\r\n![149-at-20M](https://user-images.githubusercontent.com/56156578/66223595-29c8ee00-e6d4-11e9-991c-6bc310ccdc36.jpg)\r\n![253-at-250M](https://user-images.githubusercontent.com/56156578/66223596-29c8ee00-e6d4-11e9-839a-a33c1e66f83f.jpg)\r\n![544-at-100M](https://user-images.githubusercontent.com/56156578/66223598-29c8ee00-e6d4-11e9-9001-d5b31d8e3f17.jpg)\r\n![Bead-21-Full-screen](https://user-images.githubusercontent.com/56156578/66223599-2a618480-e6d4-11e9-869b-3e2c9e742ebf.JPG)\r\n![Bead-21-impedance-chart](https://user-images.githubusercontent.com/56156578/66223600-2a618480-e6d4-11e9-9988-ba80b966773e.jpg)\r\n\r\nThanks !\r\n"}}
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