{"id":13795,"date":"2025-04-03T21:54:17","date_gmt":"2025-04-03T16:24:17","guid":{"rendered":"https:\/\/johnsonfrancis.org\/techworld\/?p=13795"},"modified":"2025-04-03T21:54:19","modified_gmt":"2025-04-03T16:24:19","slug":"how-to-measure-length-of-coax-with-nanovna","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/techworld\/how-to-measure-length-of-coax-with-nanovna\/","title":{"rendered":"How to measure length of coax with NanoVNA"},"content":{"rendered":"<iframe loading=\"lazy\" width=\"560\" height=\"315\" src=\"https:\/\/www.youtube.com\/embed\/bXRNzmKQdOo?si=inzyQJiA8x2jS3ht\" title=\"YouTube video player\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n\n<p class=\"wp-block-paragraph\">Coax length is measured using the transform function and the S11 port of the NanoVNA. What we get is either the length of the cable or the distance to the first fault in the cable. Velocity factor of the cable has to be known to calculate the stop frequency to be set in the stimulus menu of the NanoVNA. Stop Frequency (MHz) = [5850\/Maximum expected distance (m)] * Velocity Factor<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Coax length is measured using the transform function and the S11 port of the NanoVNA. What we get is either the length of the cable or the distance to the first fault in the cable. Velocity factor of the cable has to be known to calculate the stop frequency to be set in the stimulus [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":13797,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"class_list":["post-13795","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-amateur-radio-ham-radio"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>How to measure length of coax with NanoVNA - Johnson&#039;s Techworld<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/johnsonfrancis.org\/techworld\/how-to-measure-length-of-coax-with-nanovna\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"How to measure length of coax with NanoVNA - Johnson&#039;s Techworld\" \/>\n<meta property=\"og:description\" content=\"Coax length is measured using the transform function and the S11 port of the NanoVNA. What we get is either the length of the cable or the distance to the first fault in the cable. Velocity factor of the cable has to be known to calculate the stop frequency to be set in the stimulus [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/johnsonfrancis.org\/techworld\/how-to-measure-length-of-coax-with-nanovna\/\" \/>\n<meta property=\"og:site_name\" content=\"Johnson&#039;s Techworld\" \/>\n<meta property=\"article:published_time\" content=\"2025-04-03T16:24:17+00:00\" \/>\n<meta property=\"article:modified_time\" content=\"2025-04-03T16:24:19+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/johnsonfrancis.org\/techworld\/wp-content\/uploads\/2025\/04\/How-to-Measure-Length-of-Coax-with-NanoVNA.jpg\" \/>\n\t<meta property=\"og:image:width\" content=\"1200\" \/>\n\t<meta property=\"og:image:height\" content=\"679\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/jpeg\" \/>\n<meta name=\"author\" content=\"Johnson Francis\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Johnson Francis\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\\\/\\\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/how-to-measure-length-of-coax-with-nanovna\\\/#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/how-to-measure-length-of-coax-with-nanovna\\\/\"},\"author\":{\"name\":\"Johnson Francis\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/#\\\/schema\\\/person\\\/6201c843e80ccd3578e6196b1d007027\"},\"headline\":\"How to measure length of coax with NanoVNA\",\"datePublished\":\"2025-04-03T16:24:17+00:00\",\"dateModified\":\"2025-04-03T16:24:19+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/how-to-measure-length-of-coax-with-nanovna\\\/\"},\"wordCount\":76,\"publisher\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/#\\\/schema\\\/person\\\/6201c843e80ccd3578e6196b1d007027\"},\"image\":{\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/how-to-measure-length-of-coax-with-nanovna\\\/#primaryimage\"},\"thumbnailUrl\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/wp-content\\\/uploads\\\/2025\\\/04\\\/How-to-Measure-Length-of-Coax-with-NanoVNA.jpg\",\"articleSection\":[\"Amateur Radio (Ham Radio)\"],\"inLanguage\":\"en-US\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/how-to-measure-length-of-coax-with-nanovna\\\/\",\"url\":\"https:\\\/\\\/johnsonfrancis.org\\\/techworld\\\/how-to-measure-length-of-coax-with-nanovna\\\/\",\"name\":\"How to measure length of coax with NanoVNA - 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