{"id":2048,"date":"2024-08-01T10:28:13","date_gmt":"2024-08-01T08:28:13","guid":{"rendered":"https:\/\/pa3csg.nl\/?page_id=2048"},"modified":"2024-08-01T10:49:59","modified_gmt":"2024-08-01T08:49:59","slug":"high-power-low-pass-filter-for-144mhz","status":"publish","type":"page","link":"https:\/\/pa3csg.nl\/?page_id=2048","title":{"rendered":"High Power Low Pass Filter for 144MHz"},"content":{"rendered":"\n

ON6LEO needed a high power filter for his station. The coaxial filters described here<\/a> were to much of an effort in a mechanical viewpoint. We also considered the PCB filter design described here<\/a> but these were never tested on this power level. The PCB filters were the base for this filter. The capacitors were made out of 64 x 64 mm 2mm thick alu plates isolated from the groundplane by 4 layers of 1mm thick teflon. These forming 18pF capacitors.<\/p>\n\n\n\n

With a insertion loss of -0.15dB and a return loss of -21dB the filter performed well<\/p>\n\n\n\n

The input and output inductor were 3 turns on 11mm with a length of 17mm. The inductor in the middle is 3 turns on 13mm with a length of 19mm. Adjustment of the filter was done by bending \/ stretching \/ pushing the inductors.<\/p>\n\n\n\n

The filter was build by ON6LEO<\/p>\n\n\n\n

The top view of the filter:<\/p>\n\n\n\n

\"\"<\/p>\n\n\n\n

The side view of the filter<\/p>\n\n\n\n

\"\"<\/p>\n\n\n\n

The bottom view of the filter<\/p>\n\n\n\n

\"\"<\/p>\n\n\n\n

See the measurements below:<\/p>\n\n\n\n

<\/p>\n\n\n\n

\"\"\"\"<\/p>\n","protected":false},"excerpt":{"rendered":"

ON6LEO needed a high power filter for his station. The coaxial filters described here were to much of an effort in a mechanical viewpoint. We […]<\/a><\/p>\n<\/div>","protected":false},"author":1,"featured_media":2053,"parent":0,"menu_order":101,"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\/2048"}],"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=2048"}],"version-history":[{"count":6,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/pages\/2048\/revisions"}],"predecessor-version":[{"id":2057,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/pages\/2048\/revisions\/2057"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/media\/2053"}],"wp:attachment":[{"href":"https:\/\/pa3csg.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2048"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2048"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2048"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}