{"id":516,"date":"2009-06-24T09:26:08","date_gmt":"2009-06-24T03:56:08","guid":{"rendered":"http:\/\/brainstorms.in\/?p=516"},"modified":"2009-06-24T09:27:36","modified_gmt":"2009-06-24T03:57:36","slug":"adding-cw-to-bitx","status":"publish","type":"post","link":"https:\/\/brainstorms.in\/?p=516","title":{"rendered":"Adding CW to bitx"},"content":{"rendered":"<figure id=\"attachment_525\" aria-describedby=\"caption-attachment-525\" style=\"width: 300px\" class=\"wp-caption aligncenter\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-525\" title=\"bitx_cw_module\" src=\"http:\/\/brainstorms.in\/wp-content\/uploads\/2009\/06\/bitx_cw_module-300x193.jpg\" alt=\"Bitx Cw module \" width=\"300\" height=\"193\" srcset=\"https:\/\/brainstorms.in\/wp-content\/uploads\/2009\/06\/bitx_cw_module-300x193.jpg 300w, https:\/\/brainstorms.in\/wp-content\/uploads\/2009\/06\/bitx_cw_module-1024x660.jpg 1024w, https:\/\/brainstorms.in\/wp-content\/uploads\/2009\/06\/bitx_cw_module.jpg 1060w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><figcaption id=\"caption-attachment-525\" class=\"wp-caption-text\">Bitx Cw module <\/figcaption><\/figure>\n<p>I was playing with\u00a0 my bitx build yesterday. Specifically, I tried to add CW\u00a0 to the rig.\u00a0\u00a0 Original bitx20 is a SSB rig.\u00a0 I my mod was inspired from <a href=\"http:\/\/br.geocities.com\/py2ohh\/trx\/bitx\/bitx.htm\" target=\"_blank\">PY2OHH bitx40<\/a>.\u00a0 I\u00a0 wired\u00a0 up a 10mhz crystal oscillator as shown below.<\/p>\n<dl id=\"attachment_517\" class=\"wp-caption aligncenter\" style=\"width: 305px;\">\n<dt class=\"wp-caption-dt\"><img loading=\"lazy\" decoding=\"async\" class=\"size-full wp-image-517\" title=\"bitxcw\" src=\"http:\/\/brainstorms.in\/wp-content\/uploads\/2009\/06\/bitxcw.png\" alt=\"bitx20 CW module\" width=\"295\" height=\"187\" \/><\/dt>\n<\/dl>\n<p>The idea is to inject 10mhz ( approximately) at the\u00a0 beginning of transmitter IF amplifier. This will in turn produce 14 mhz sine wave at the output.\u00a0 The receiver part is unmodified.\u00a0 See the diagram below.\u00a0 Connect\u00a0 the point marked X to the point x .<\/p>\n<p style=\"text-align: center;\">\n<figure id=\"attachment_519\" aria-describedby=\"caption-attachment-519\" style=\"width: 749px\" class=\"wp-caption aligncenter\"><a href=\"http:\/\/brainstorms.in\/wp-content\/uploads\/2009\/06\/bitx-300x218.gif\"><img loading=\"lazy\" decoding=\"async\" class=\"size-medium wp-image-519\" title=\"bitx\" src=\"http:\/\/brainstorms.in\/wp-content\/uploads\/2009\/06\/bitx-300x218.gif\" alt=\"Bitx 20 modified for cw\" width=\"749\" height=\"542\" \/><\/a><figcaption id=\"caption-attachment-519\" class=\"wp-caption-text\">Bitx 20 modified for cw<\/figcaption><\/figure>\n<p>Adjust the\u00a0 10Mhz oscillator to\u00a0 around 700khz above the\u00a0 BFO frequency. I added a small inductor (10 micro henry) in series with the crystal to adjust the frequency near BFO,.It is not shown on the figure above.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I was playing with\u00a0 my bitx build yesterday. Specifically, I tried to add CW\u00a0 to the rig.\u00a0\u00a0 Original bitx20 is a SSB rig.\u00a0 I my mod was inspired from PY2OHH bitx40.\u00a0 I\u00a0 wired\u00a0 up a 10mhz crystal oscillator as shown below. The idea is to inject 10mhz ( approximately) at the\u00a0 beginning of transmitter IF&hellip; <a href=\"https:\/\/brainstorms.in\/?p=516\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Adding CW to bitx<\/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":[42,51,50],"class_list":["post-516","post","type-post","status-publish","format-standard","hentry","category-ham-radio","tag-bitx","tag-bitx-qrp","tag-bitx40"],"_links":{"self":[{"href":"https:\/\/brainstorms.in\/index.php?rest_route=\/wp\/v2\/posts\/516","targetHints":{"allow":["GET"]}}],"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=516"}],"version-history":[{"count":10,"href":"https:\/\/brainstorms.in\/index.php?rest_route=\/wp\/v2\/posts\/516\/revisions"}],"predecessor-version":[{"id":528,"href":"https:\/\/brainstorms.in\/index.php?rest_route=\/wp\/v2\/posts\/516\/revisions\/528"}],"wp:attachment":[{"href":"https:\/\/brainstorms.in\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=516"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/brainstorms.in\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=516"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/brainstorms.in\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=516"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}