{"id":16,"date":"2009-10-30T16:51:49","date_gmt":"2009-10-30T15:51:49","guid":{"rendered":"https:\/\/pa3csg.nl\/?page_id=16"},"modified":"2016-12-23T07:32:18","modified_gmt":"2016-12-23T06:32:18","slug":"high-power-low-pass-filters","status":"publish","type":"page","link":"https:\/\/pa3csg.nl\/?page_id=16","title":{"rendered":"High Power Low Pass filters"},"content":{"rendered":"<p>Presented here are some high power low pass filters for 144 and for 432 MHz. These filters are coaxial step impedance filters and can take a lot of RF power. In fact the power is limited by the connector. Off course the 7\/16 connector can tale a lot more power.<\/p>\n<p>The inner and outer conductor are separated by a 0.3mm thin teflon sheet. Tuning this filter can be best done by terminating one end with a good 50 Ohm load and measuring the S11 on the other end. A good match will assure you a low loss. The stop band attenuation has never been a problem.<\/p>\n<p><img loading=\"lazy\" class=\"size-medium wp-image-1007 aligncenter\" src=\"https:\/\/pa3csg.nl\/wp-content\/uploads\/2009\/10\/fot-fil-1-260x300.jpg\" alt=\"fot-fil\" width=\"260\" height=\"300\" srcset=\"https:\/\/pa3csg.nl\/wp-content\/uploads\/2009\/10\/fot-fil-1-260x300.jpg 260w, https:\/\/pa3csg.nl\/wp-content\/uploads\/2009\/10\/fot-fil-1-519x600.jpg 519w, https:\/\/pa3csg.nl\/wp-content\/uploads\/2009\/10\/fot-fil-1.jpg 558w\" sizes=\"(max-width: 260px) 100vw, 260px\" \/><\/p>\n<p>Below are the construction details of the filters:<\/p>\n<p><img loading=\"lazy\" class=\"size-medium wp-image-1008 aligncenter\" src=\"https:\/\/pa3csg.nl\/wp-content\/uploads\/2009\/10\/hp-lpf-300x215.jpg\" alt=\"hp-lpf\" width=\"300\" height=\"215\" srcset=\"https:\/\/pa3csg.nl\/wp-content\/uploads\/2009\/10\/hp-lpf-300x215.jpg 300w, https:\/\/pa3csg.nl\/wp-content\/uploads\/2009\/10\/hp-lpf-600x430.jpg 600w, https:\/\/pa3csg.nl\/wp-content\/uploads\/2009\/10\/hp-lpf.jpg 700w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p>Measurements by Jack Smeets, PE1KXH<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p><img loading=\"lazy\" class=\"size-medium wp-image-1010 aligncenter\" src=\"https:\/\/pa3csg.nl\/wp-content\/uploads\/2009\/10\/filt-plt144-300x262.jpg\" alt=\"filt-plt144\" width=\"300\" height=\"262\" srcset=\"https:\/\/pa3csg.nl\/wp-content\/uploads\/2009\/10\/filt-plt144-300x262.jpg 300w, https:\/\/pa3csg.nl\/wp-content\/uploads\/2009\/10\/filt-plt144.jpg 400w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n<p><img loading=\"lazy\" class=\"size-medium wp-image-1011 aligncenter\" src=\"https:\/\/pa3csg.nl\/wp-content\/uploads\/2009\/10\/filt-plt432-300x254.jpg\" alt=\"filt-plt432\" width=\"300\" height=\"254\" srcset=\"https:\/\/pa3csg.nl\/wp-content\/uploads\/2009\/10\/filt-plt432-300x254.jpg 300w, https:\/\/pa3csg.nl\/wp-content\/uploads\/2009\/10\/filt-plt432.jpg 400w\" sizes=\"(max-width: 300px) 100vw, 300px\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<div class=\"mh-excerpt\"><p>Presented here are some high power low pass filters for 144 and for 432 MHz. These filters are coaxial step impedance filters and can take <a class=\"mh-excerpt-more\" href=\"https:\/\/pa3csg.nl\/?page_id=16\" title=\"High Power Low Pass filters\">[&#8230;]<\/a><\/p>\n<\/div>","protected":false},"author":1,"featured_media":904,"parent":0,"menu_order":78,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"categories":[39,16],"tags":[],"_links":{"self":[{"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/pages\/16"}],"collection":[{"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=16"}],"version-history":[{"count":5,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/pages\/16\/revisions"}],"predecessor-version":[{"id":1013,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/pages\/16\/revisions\/1013"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/media\/904"}],"wp:attachment":[{"href":"https:\/\/pa3csg.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=16"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=16"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=16"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}