{"id":288,"date":"2013-03-01T17:25:46","date_gmt":"2013-03-01T16:25:46","guid":{"rendered":"http:\/\/sadars.co.uk\/blog\/?p=288"},"modified":"2013-03-01T17:25:46","modified_gmt":"2013-03-01T16:25:46","slug":"28-feb-1013-the-smith-chart","status":"publish","type":"post","link":"https:\/\/sadars.co.uk\/wp\/archives\/288","title":{"rendered":"28 Feb 2013 – The Smith Chart"},"content":{"rendered":"

\"40m<\/a><\/p>\n

It’s enough to strike terror into the hearts of many radio amateurs who had to learn how it worked and how to use it.<\/p>\n

However, Stewart, G3RXQ showed that it’s not quite as complicated as first thought and the results can lead to an efficient antenna that really ‘gets out’.\u00a0 Many amateurs are lead to believe that buying an ATU, or more correctly, an Aerial Matching Unit, can solve most antenna problems just by presenting the transmitter with a 50 ohm load.\u00a0 These units might be more correctly called ‘Transmitters Tranquilizers’ since they do nothing to tune your antenna, only keep the transmitter happy, while the un-resonant antenna at the other end of the transmission line might be wasting up to 95% of the power presented to it, leaving only a few watts for actual transmission.<\/p>\n

By using an ‘active’ Smith Chart, Stewart showed how the situation could be visualised and also what was needed at the antenna end in the way of capacitance or inductance to match the antenna impedance, thus using almost all the power for transmissions.<\/p>\n

The ‘active’ Smith Chart can be found on the internet at: http:\/\/science4all.nl\/?Electronics::Pasan\u00a0 This excellent programme was written by Marien van Westen (PA0MVW) and offered, free of charge.\u00a0\u00a0\u00a0\u00a0 It brings the Smith Chart of 1939 right up to date!<\/p>\n","protected":false},"excerpt":{"rendered":"

It’s enough to strike terror into the hearts of many radio amateurs who had to learn how it worked and how to use it. However, Stewart, G3RXQ showed that it’s not quite as complicated as first thought and the results can lead to an efficient antenna that really ‘gets out’.\u00a0 Many amateurs are lead to … Continue reading 28 Feb 2013 – The Smith Chart<\/span> →<\/span><\/a><\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-288","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"yoast_head":"\n28 Feb 2013 - The Smith Chart - SADARS: Shefford and District Amateur Radio Society<\/title>\n<meta name=\"robots\" content=\"noindex, follow\" \/>\n<meta property=\"og:locale\" content=\"en_GB\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"28 Feb 2013 - The Smith Chart - SADARS: Shefford and District Amateur Radio Society\" \/>\n<meta property=\"og:description\" content=\"It’s enough to strike terror into the hearts of many radio amateurs who had to learn how it worked and how to use it. However, Stewart, G3RXQ showed that it’s not quite as complicated as first thought and the results can lead to an efficient antenna that really ‘gets out’.\u00a0 Many amateurs are lead to … Continue reading 28 Feb 2013 – The Smith Chart →\" \/>\n<meta property=\"og:url\" content=\"https:\/\/sadars.co.uk\/wp\/archives\/288\" \/>\n<meta property=\"og:site_name\" content=\"SADARS: Shefford and District Amateur Radio Society\" \/>\n<meta property=\"article:published_time\" content=\"2013-03-01T16:25:46+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/sadars.co.uk\/wp\/wp-content\/uploads\/2013\/03\/40m-Phased-Verts.jpg\" \/>\n<meta name=\"author\" content=\"G4YRF\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"G4YRF\" \/>\n\t<meta name=\"twitter:label2\" content=\"Estimated 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:\\\/\\\/sadars.co.uk\\\/wp\\\/archives\\\/288#article\",\"isPartOf\":{\"@id\":\"https:\\\/\\\/sadars.co.uk\\\/wp\\\/archives\\\/288\"},\"author\":{\"name\":\"G4YRF\",\"@id\":\"https:\\\/\\\/sadars.co.uk\\\/wp\\\/#\\\/schema\\\/person\\\/016edeac49c01e211c69a8aa678fe999\"},\"headline\":\"28 Feb 2013 – The Smith Chart\",\"datePublished\":\"2013-03-01T16:25:46+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\\\/\\\/sadars.co.uk\\\/wp\\\/archives\\\/288\"},\"wordCount\":226,\"image\":{\"@id\":\"https:\\\/\\\/sadars.co.uk\\\/wp\\\/archives\\\/288#primaryimage\"},\"thumbnailUrl\":\"http:\\\/\\\/sadars.co.uk\\\/wp\\\/wp-content\\\/uploads\\\/2013\\\/03\\\/40m-Phased-Verts.jpg\",\"articleSection\":[\"Uncategorized\"],\"inLanguage\":\"en-GB\"},{\"@type\":\"WebPage\",\"@id\":\"https:\\\/\\\/sadars.co.uk\\\/wp\\\/archives\\\/288\",\"url\":\"https:\\\/\\\/sadars.co.uk\\\/wp\\\/archives\\\/288\",\"name\":\"28 Feb 2013 - 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