{"id":1141,"date":"2017-07-27T14:14:25","date_gmt":"2017-07-27T12:14:25","guid":{"rendered":"https:\/\/pa3csg.nl\/?page_id=1141"},"modified":"2019-05-08T08:27:45","modified_gmt":"2019-05-08T06:27:45","slug":"broadband-amplifier-from-50-to-450-mhz","status":"publish","type":"page","link":"https:\/\/pa3csg.nl\/?page_id=1141","title":{"rendered":"Broadband amplifier from 50 to 450 MHz"},"content":{"rendered":"<p>For my newly build 50-70 MHz amplifier I needed a suitable driver. I needed about 5W drive. I started with a CATV module, the BGY888. This module was able to produce 2.5W over a wide frequency range. At 2,5W it was going into 4dB of compression. It was enough for the initial tests. But I needed a bit more. The superb website of Paul W1GHZ offered a broadband design with a BLF2043. Found <a href=\"http:\/\/www.w1ghz.org\/small_proj\/Simple_Broadband_Power_Amplifiers.pdf\">HERE<\/a><\/p>\n<p>This was quickly build and was found to be working. Although the amplifier went in saturation very quickly, per advice of PA0WMX the output was changed to a 4C6 core with 37 Ohm coax ( 2 x 75 Ohm in parallel), this gave 7W on 50 &amp; 70 MHz, 6W on 144 MHz and 5W on 432 MHz. Perfect for my needs. A 0dBm input driver for my 50-70 MHz PA!<\/p>\n<p>Some tries to increase the inductance of the chokes gave no improvement.<\/p>\n<p><img loading=\"lazy\" class=\"wp-image-1142 aligncenter\" src=\"https:\/\/pa3csg.nl\/wp-content\/uploads\/2017\/07\/DSC_7125-300x251.jpg\" alt=\"DSC_7125\" width=\"600\" height=\"502\" srcset=\"https:\/\/pa3csg.nl\/wp-content\/uploads\/2017\/07\/DSC_7125-300x251.jpg 300w, https:\/\/pa3csg.nl\/wp-content\/uploads\/2017\/07\/DSC_7125-600x502.jpg 600w, https:\/\/pa3csg.nl\/wp-content\/uploads\/2017\/07\/DSC_7125-1024x857.jpg 1024w\" sizes=\"(max-width: 600px) 100vw, 600px\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<div class=\"mh-excerpt\"><p>For my newly build 50-70 MHz amplifier I needed a suitable driver. I needed about 5W drive. I started with a CATV module, the BGY888. <a class=\"mh-excerpt-more\" href=\"https:\/\/pa3csg.nl\/?page_id=1141\" title=\"Broadband amplifier from 50 to 450 MHz\">[&#8230;]<\/a><\/p>\n<\/div>","protected":false},"author":1,"featured_media":1142,"parent":0,"menu_order":13,"comment_status":"closed","ping_status":"closed","template":"","meta":[],"categories":[38,39],"tags":[],"_links":{"self":[{"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/pages\/1141"}],"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=1141"}],"version-history":[{"count":1,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/pages\/1141\/revisions"}],"predecessor-version":[{"id":1144,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/pages\/1141\/revisions\/1144"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=\/wp\/v2\/media\/1142"}],"wp:attachment":[{"href":"https:\/\/pa3csg.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1141"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1141"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/pa3csg.nl\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1141"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}