{"id":422,"date":"2015-10-30T14:25:04","date_gmt":"2015-10-30T12:25:04","guid":{"rendered":"http:\/\/ha3ln.hu\/?p=422"},"modified":"2022-06-10T21:30:45","modified_gmt":"2022-06-10T19:30:45","slug":"element-vibration","status":"publish","type":"post","link":"https:\/\/ha3ln.hu\/?p=422","title":{"rendered":"Element vibration"},"content":{"rendered":"<p><!--more--><\/p>\n<p>During the WW SSB preparation tower works I observed an interesting noise from the elements. After a closer look it turned out that due to (even low speed) the wind the 20m antenna elements start to resonate and move like a sinus wave. More interestingly this happens only to the reflector and 2nd director.<\/p>\n<p>I&#8217;m sure this is not healthy on long term and this might cause damage to the elements. It&#8217;s needed to find a way to de-tune the REF and D2 to avoid this resonance.<\/p>\n\r\n    <div>        \r\n    <video id=\"plyr6a9e8af686ba9\" controls class=\"easy-video-player\">\r\n       <source src=\"https:\/\/ha3ln.hu\/wp-content\/uploads\/2015\/10\/el_vibration1.mp4\" type=\"video\/mp4\" \/>\r\n    <\/video>\r\n    <\/div>    <script>\r\n        const evplayerplyr6a9e8af686ba9 = new Plyr(document.getElementById('plyr6a9e8af686ba9'));\r\n        evplayerplyr6a9e8af686ba9.ratio = '16:9';\r\n        evplayerplyr6a9e8af686ba9.iconUrl = 'https:\/\/ha3ln.hu\/wp-content\/plugins\/easy-video-player\/lib\/plyr.svg';\r\n        evplayerplyr6a9e8af686ba9.blankVideo = 'https:\/\/ha3ln.hu\/wp-content\/plugins\/easy-video-player\/lib\/blank.mp4';  \r\n    <\/script>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"_links":{"self":[{"href":"https:\/\/ha3ln.hu\/index.php?rest_route=\/wp\/v2\/posts\/422"}],"collection":[{"href":"https:\/\/ha3ln.hu\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ha3ln.hu\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ha3ln.hu\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ha3ln.hu\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=422"}],"version-history":[{"count":19,"href":"https:\/\/ha3ln.hu\/index.php?rest_route=\/wp\/v2\/posts\/422\/revisions"}],"predecessor-version":[{"id":2424,"href":"https:\/\/ha3ln.hu\/index.php?rest_route=\/wp\/v2\/posts\/422\/revisions\/2424"}],"wp:attachment":[{"href":"https:\/\/ha3ln.hu\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=422"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ha3ln.hu\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=422"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ha3ln.hu\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=422"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}