{"id":2012,"date":"2024-06-14T21:55:55","date_gmt":"2024-06-14T19:55:55","guid":{"rendered":"https:\/\/pa3csg.nl\/?page_id=2012"},"modified":"2024-06-15T11:13:05","modified_gmt":"2024-06-15T09:13:05","slug":"50-mhz-low-pass-filter-cauer","status":"publish","type":"page","link":"https:\/\/pa3csg.nl\/?page_id=2012","title":{"rendered":"50 MHz Low Pass Filter Cauer"},"content":{"rendered":"\n<p>The filter was build in a tin box 160x100x50mm. All inductors are wound on a 20mm dia. Wire thickness is 2mm copper wire. Capacitors are ATC800 series these can be replaced by doorknob capacitors or any othe capacitor suitable for the power used..<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" width=\"1024\" height=\"628\" src=\"https:\/\/pa3csg.nl\/wp-content\/uploads\/2024\/06\/50MHz-cauer-LPF-foto-1024x628.jpeg\" alt=\"\" class=\"wp-image-2013\" srcset=\"https:\/\/pa3csg.nl\/wp-content\/uploads\/2024\/06\/50MHz-cauer-LPF-foto-1024x628.jpeg 1024w, https:\/\/pa3csg.nl\/wp-content\/uploads\/2024\/06\/50MHz-cauer-LPF-foto-300x184.jpeg 300w, https:\/\/pa3csg.nl\/wp-content\/uploads\/2024\/06\/50MHz-cauer-LPF-foto-600x368.jpeg 600w, https:\/\/pa3csg.nl\/wp-content\/uploads\/2024\/06\/50MHz-cauer-LPF-foto-1536x942.jpeg 1536w, https:\/\/pa3csg.nl\/wp-content\/uploads\/2024\/06\/50MHz-cauer-LPF-foto-2048x1256.jpeg 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>The schematic looks as follows:<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" width=\"1024\" height=\"526\" src=\"https:\/\/pa3csg.nl\/wp-content\/uploads\/2024\/06\/50MHz-LPF-Cauer-1024x526.png\" alt=\"\" class=\"wp-image-2019\" srcset=\"https:\/\/pa3csg.nl\/wp-content\/uploads\/2024\/06\/50MHz-LPF-Cauer-1024x526.png 1024w, https:\/\/pa3csg.nl\/wp-content\/uploads\/2024\/06\/50MHz-LPF-Cauer-300x154.png 300w, https:\/\/pa3csg.nl\/wp-content\/uploads\/2024\/06\/50MHz-LPF-Cauer-600x308.png 600w, https:\/\/pa3csg.nl\/wp-content\/uploads\/2024\/06\/50MHz-LPF-Cauer.png 1314w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<figure class=\"wp-block-table is-style-regular\"><table><thead><tr><th class=\"has-text-align-center\" data-align=\"center\">Component<\/th><th class=\"has-text-align-center\" data-align=\"center\">Value<\/th><\/tr><\/thead><tbody><tr><td class=\"has-text-align-center\" data-align=\"center\">L1<\/td><td class=\"has-text-align-center\" data-align=\"center\">3 turns 20mm dia 30mm long<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">L2<\/td><td class=\"has-text-align-center\" data-align=\"center\">4 turns 22mm dia 30mm long<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">L3<\/td><td class=\"has-text-align-center\" data-align=\"center\">4 turns 25mm dia 30mm long<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">L4<\/td><td class=\"has-text-align-center\" data-align=\"center\">1 turns 20mm dia 20mm long<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">L5<\/td><td class=\"has-text-align-center\" data-align=\"center\">1 turns 20mm dia 10mm long<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">C1<\/td><td class=\"has-text-align-center\" data-align=\"center\">68pF<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">C2<\/td><td class=\"has-text-align-center\" data-align=\"center\">68pF<\/td><\/tr><tr><td class=\"has-text-align-center\" data-align=\"center\">C3<\/td><td class=\"has-text-align-center\" data-align=\"center\">39pF<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p>The suppression of the second harmonic is good. If more attention was payed to the shielding of the individual inductors  -50dB would be possible. The input match is good with -25dB and was easy to obtain.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" width=\"1024\" height=\"633\" src=\"https:\/\/pa3csg.nl\/wp-content\/uploads\/2024\/06\/50MHz-cauer-LPF-plot-1024x633.jpeg\" alt=\"\" class=\"wp-image-2014\" srcset=\"https:\/\/pa3csg.nl\/wp-content\/uploads\/2024\/06\/50MHz-cauer-LPF-plot-1024x633.jpeg 1024w, https:\/\/pa3csg.nl\/wp-content\/uploads\/2024\/06\/50MHz-cauer-LPF-plot-300x185.jpeg 300w, https:\/\/pa3csg.nl\/wp-content\/uploads\/2024\/06\/50MHz-cauer-LPF-plot-600x371.jpeg 600w, https:\/\/pa3csg.nl\/wp-content\/uploads\/2024\/06\/50MHz-cauer-LPF-plot-1536x949.jpeg 1536w, https:\/\/pa3csg.nl\/wp-content\/uploads\/2024\/06\/50MHz-cauer-LPF-plot-2048x1266.jpeg 2048w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n","protected":false},"excerpt":{"rendered":"<div class=\"mh-excerpt\"><p>The filter was build in a tin box 160x100x50mm. All inductors are wound on a 20mm dia. Wire thickness is 2mm copper wire. Capacitors are <a class=\"mh-excerpt-more\" href=\"https:\/\/pa3csg.nl\/?page_id=2012\" title=\"50 MHz Low Pass Filter Cauer\">[&#8230;]<\/a><\/p>\n<\/div>","protected":false},"author":1,"featured_media":2014,"parent":0,"menu_order":100,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"categories":[38,20],"tags":[],"_links":{"self":[{"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/pages\/2012"}],"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=2012"}],"version-history":[{"count":7,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/pages\/2012\/revisions"}],"predecessor-version":[{"id":2022,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/pages\/2012\/revisions\/2022"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/media\/2014"}],"wp:attachment":[{"href":"https:\/\/pa3csg.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2012"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2012"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2012"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}