{"id":4318,"date":"2023-10-16T09:23:04","date_gmt":"2023-10-16T03:53:04","guid":{"rendered":"https:\/\/johnsonfrancis.org\/techworld\/?p=4318"},"modified":"2024-02-09T06:52:28","modified_gmt":"2024-02-09T01:22:28","slug":"pictorial-review-of-gamma-match-implementation","status":"publish","type":"post","link":"https:\/\/johnsonfrancis.org\/techworld\/pictorial-review-of-gamma-match-implementation\/","title":{"rendered":"Pictorial Review of Gamma Match Implementation"},"content":{"rendered":"<h2><span style=\"color: #008000;\">Pictorial Review of Gamma Match Implementation<\/span><\/h2>\n<p>Here is the gamma match on my 5 element UHF Yagi antenna.\u00a0This pictorial review is complementary to<br \/>\nmy previous post on gamma match, regarding\u00a0implementation for Yagi antennas.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-4319\" src=\"https:\/\/johnsonfrancis.org\/techworld\/wp-content\/uploads\/2023\/10\/Pictorial-Review-of-Gamma-Match-Implementation.jpg\" alt=\"\" width=\"1200\" height=\"676\" srcset=\"https:\/\/johnsonfrancis.org\/techworld\/wp-content\/uploads\/2023\/10\/Pictorial-Review-of-Gamma-Match-Implementation.jpg 1200w, https:\/\/johnsonfrancis.org\/techworld\/wp-content\/uploads\/2023\/10\/Pictorial-Review-of-Gamma-Match-Implementation-300x169.jpg 300w, https:\/\/johnsonfrancis.org\/techworld\/wp-content\/uploads\/2023\/10\/Pictorial-Review-of-Gamma-Match-Implementation-1024x577.jpg 1024w, https:\/\/johnsonfrancis.org\/techworld\/wp-content\/uploads\/2023\/10\/Pictorial-Review-of-Gamma-Match-Implementation-768x433.jpg 768w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><\/p>\n<p>Closeup view of the gamma match assembly on the UHF Yagi, showing the gamma shorting stub, gamma tube, RG 6 coax with sleave and sheath removed and the connection to SO 239 fixed on the boom near the driven element. Gamma shorting stub can be moved over the gamma tube and driven element, millimeter by millimeter, checking the SWR, for tuning the Yagi antenna for minimum SWR. When the best SWR is obtained, the screws on the shorting stub can be tightened further to prevent inadvertent movements.\u00a0SWR is rechecked once again for confirmation.\u00a0Adjusting the gamma match is in effect tuning a variable capacitor formed by the combination\u00a0of coax inner conductor with dielectric covering<br \/>\nand the gamma tube surrounding it.<\/p>\n<figure id=\"attachment_4321\" aria-describedby=\"caption-attachment-4321\" style=\"width: 1200px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-4321\" src=\"https:\/\/johnsonfrancis.org\/techworld\/wp-content\/uploads\/2023\/10\/Closeup-view-of-the-gamma-match-assembly-on-the-UHF-Yagi.jpg\" alt=\"\" width=\"1200\" height=\"675\" srcset=\"https:\/\/johnsonfrancis.org\/techworld\/wp-content\/uploads\/2023\/10\/Closeup-view-of-the-gamma-match-assembly-on-the-UHF-Yagi.jpg 1200w, https:\/\/johnsonfrancis.org\/techworld\/wp-content\/uploads\/2023\/10\/Closeup-view-of-the-gamma-match-assembly-on-the-UHF-Yagi-300x169.jpg 300w, https:\/\/johnsonfrancis.org\/techworld\/wp-content\/uploads\/2023\/10\/Closeup-view-of-the-gamma-match-assembly-on-the-UHF-Yagi-1024x576.jpg 1024w, https:\/\/johnsonfrancis.org\/techworld\/wp-content\/uploads\/2023\/10\/Closeup-view-of-the-gamma-match-assembly-on-the-UHF-Yagi-768x432.jpg 768w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption id=\"caption-attachment-4321\" class=\"wp-caption-text\"><strong><span style=\"color: #0000ff;\">Closeup view of the gamma match assembly on the UHF Yagi<\/span><\/strong><\/figcaption><\/figure>\n<p>Here is a picture of the gamma match on my 7 element VHF Yagi prototype, mounted on PVC\u00a0mast.<\/p>\n<figure id=\"attachment_4322\" aria-describedby=\"caption-attachment-4322\" style=\"width: 1200px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-4322\" src=\"https:\/\/johnsonfrancis.org\/techworld\/wp-content\/uploads\/2023\/10\/Gamma-match-on-my-7-element-VHF-Yagi-prototype-mounted-on-PVC-mast.jpg\" alt=\"\" width=\"1200\" height=\"870\" srcset=\"https:\/\/johnsonfrancis.org\/techworld\/wp-content\/uploads\/2023\/10\/Gamma-match-on-my-7-element-VHF-Yagi-prototype-mounted-on-PVC-mast.jpg 1200w, https:\/\/johnsonfrancis.org\/techworld\/wp-content\/uploads\/2023\/10\/Gamma-match-on-my-7-element-VHF-Yagi-prototype-mounted-on-PVC-mast-300x218.jpg 300w, https:\/\/johnsonfrancis.org\/techworld\/wp-content\/uploads\/2023\/10\/Gamma-match-on-my-7-element-VHF-Yagi-prototype-mounted-on-PVC-mast-1024x742.jpg 1024w, https:\/\/johnsonfrancis.org\/techworld\/wp-content\/uploads\/2023\/10\/Gamma-match-on-my-7-element-VHF-Yagi-prototype-mounted-on-PVC-mast-768x557.jpg 768w\" sizes=\"auto, (max-width: 1200px) 100vw, 1200px\" \/><figcaption id=\"caption-attachment-4322\" class=\"wp-caption-text\"><strong><span style=\"color: #0000ff;\">Gamma match on my 7 element VHF Yagi prototype, mounted on PVC mast<\/span><\/strong><\/figcaption><\/figure>\n<p>Close up of the gamma match on the seven element VHF Yagi, showing gamma pipe, shorting stub,\u00a0RG 6 coax with sheath and sleeve removed, inside the gamma pipe, SO 239 mounted on the\u00a0boom near the driven element, and the HLF 200 cable connected to the SO 239 with a PL\u00a0259 connector.<\/p>\n<figure id=\"attachment_4323\" aria-describedby=\"caption-attachment-4323\" style=\"width: 1178px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-4323\" src=\"https:\/\/johnsonfrancis.org\/techworld\/wp-content\/uploads\/2023\/10\/Close-up-of-the-gamma-match-on-the-seven-element-VHF-Yagi.jpg\" alt=\"\" width=\"1178\" height=\"675\" srcset=\"https:\/\/johnsonfrancis.org\/techworld\/wp-content\/uploads\/2023\/10\/Close-up-of-the-gamma-match-on-the-seven-element-VHF-Yagi.jpg 1178w, https:\/\/johnsonfrancis.org\/techworld\/wp-content\/uploads\/2023\/10\/Close-up-of-the-gamma-match-on-the-seven-element-VHF-Yagi-300x172.jpg 300w, https:\/\/johnsonfrancis.org\/techworld\/wp-content\/uploads\/2023\/10\/Close-up-of-the-gamma-match-on-the-seven-element-VHF-Yagi-1024x587.jpg 1024w, https:\/\/johnsonfrancis.org\/techworld\/wp-content\/uploads\/2023\/10\/Close-up-of-the-gamma-match-on-the-seven-element-VHF-Yagi-768x440.jpg 768w\" sizes=\"auto, (max-width: 1178px) 100vw, 1178px\" \/><figcaption id=\"caption-attachment-4323\" class=\"wp-caption-text\"><strong><span style=\"color: #0000ff;\">Close up of the gamma match on the seven element VHF Yagi<\/span><\/strong><\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"<p>Pictorial Review of Gamma Match Implementation Here is the gamma match on my 5 element UHF Yagi antenna.\u00a0This pictorial review is complementary to my previous post on gamma match, regarding\u00a0implementation for Yagi antennas. Closeup view of the gamma match assembly on the UHF Yagi, showing the gamma shorting stub, gamma tube, RG 6 coax with [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":4319,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7,13,12,19],"tags":[],"class_list":["post-4318","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-amateur-radio-ham-radio","category-amateur-radio-from-international-space-station","category-amateur-radio-satellites","category-antenna-and-propagation"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.9 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Pictorial Review of Gamma Match Implementation - 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\/pictorial-review-of-gamma-match-implementation\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Pictorial Review of Gamma Match Implementation - Johnson&#039;s Techworld\" \/>\n<meta property=\"og:description\" content=\"Pictorial Review of Gamma Match Implementation Here is the gamma match on my 5 element UHF Yagi antenna.\u00a0This pictorial review is complementary to my previous post on gamma match, regarding\u00a0implementation for Yagi antennas. 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