{"id":223,"date":"2008-11-25T21:57:21","date_gmt":"2008-11-25T16:27:21","guid":{"rendered":"http:\/\/brainstorms.in\/?p=223"},"modified":"2008-11-25T22:17:24","modified_gmt":"2008-11-25T16:47:24","slug":"building-bitx-part3-the-linear-amplifier","status":"publish","type":"post","link":"https:\/\/brainstorms.in\/?p=223","title":{"rendered":"Building Bitx Part3 &#8211; The linear Amplifier"},"content":{"rendered":"<p>&nbsp; I built the bitx 20&nbsp; linear(PA) last week end. My first build of the PA was done on the bitx transceiver board itself.&nbsp; It done in dead bug style.&nbsp; When i switched on the power the PA oscillated. I&nbsp; read several posts on the mailing list and tried some adjustments. Still it was oscillating. Finally, i decides to shift the PA to a separate board and shield it.<\/p>\n<p>The following pictures show how i did wire up th PA.<\/p>\n<p>&nbsp;&nbsp; <img loading=\"lazy\" decoding=\"async\" style=\"max-width: 800px;\" src=\"http:\/\/brainstorms.in\/wp-content\/uploads\/2008\/11\/110920082021.jpg\" width=\"580\" height=\"435\" \/><\/p>\n<p>&nbsp;Chips of PCB&nbsp; fixed to a 3&#8217;x3.5&#8242; board. The board is divided into two compartments with a piece of aluminum which also serves as heat sink for IRF 510.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" style=\"max-width: 800px;\" src=\"http:\/\/brainstorms.in\/wp-content\/uploads\/2008\/11\/110920082023.jpg\" width=\"589\" height=\"441\" \/><\/p>\n<p>&nbsp;The IRF 510 wired. Since the heat sink is grounded, the drain of the IRF 510 MOSFET was shielded using a mica washer.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" style=\"max-width: 800px;\" src=\"http:\/\/brainstorms.in\/wp-content\/uploads\/2008\/11\/bitx-manhattan2.jpg\" width=\"600\" height=\"449\" \/><br \/>&nbsp;The wiring is almost complete.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" style=\"max-width: 800px;\" src=\"http:\/\/brainstorms.in\/wp-content\/uploads\/2008\/11\/bitx-manhattan4.jpg\" width=\"597\" height=\"447\" \/><\/p>\n<p>&nbsp; The PA attached to my bitx board.&nbsp; The oscillation have stopped now. But the power output seems to be low. I am waiting for the next weekend :D)<\/p>\n","protected":false},"excerpt":{"rendered":"<p>&nbsp; I built the bitx 20&nbsp; linear(PA) last week end. My first build of the PA was done on the bitx transceiver board itself.&nbsp; It done in dead bug style.&nbsp; When i switched on the power the PA oscillated. I&nbsp; read several posts on the mailing list and tried some adjustments. Still it was oscillating.&hellip; <a class=\"more-link\" href=\"https:\/\/brainstorms.in\/?p=223\">Continue reading <span class=\"screen-reader-text\">Building Bitx Part3 &#8211; The linear Amplifier<\/span><\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7],"tags":[],"_links":{"self":[{"href":"https:\/\/brainstorms.in\/index.php?rest_route=\/wp\/v2\/posts\/223"}],"collection":[{"href":"https:\/\/brainstorms.in\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/brainstorms.in\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/brainstorms.in\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/brainstorms.in\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=223"}],"version-history":[{"count":0,"href":"https:\/\/brainstorms.in\/index.php?rest_route=\/wp\/v2\/posts\/223\/revisions"}],"wp:attachment":[{"href":"https:\/\/brainstorms.in\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=223"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/brainstorms.in\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=223"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/brainstorms.in\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=223"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}