{"id":2392,"date":"2013-09-15T09:32:00","date_gmt":"2013-09-14T23:32:00","guid":{"rendered":"https:\/\/www.homebrewradio.us\/blog\/2013\/09\/15\/bitx-build-update-7\/"},"modified":"2025-07-21T13:13:03","modified_gmt":"2025-07-21T03:13:03","slug":"bitx-build-update-7","status":"publish","type":"post","link":"https:\/\/www.homebrewradio.us\/blog\/2013\/09\/15\/bitx-build-update-7\/","title":{"rendered":"BITX Build Update # 7"},"content":{"rendered":"<div class=\"separator\" style=\"clear: both; text-align: center;\"> <a href=\"https:\/\/www.homebrewradio.us\/blog\/wp-content\/uploads\/2013\/09\/P1010188.jpg\" imageanchor=\"1\" style=\"margin-left: 1em; margin-right: 1em;\"><img loading=\"lazy\" decoding=\"async\" border=\"0\" height=\"239\" src=\"https:\/\/www.homebrewradio.us\/blog\/wp-content\/uploads\/2013\/09\/P1010188.jpg\" width=\"320\" \/><\/a><\/div>\n<p> <strong>As you can see (above) I&#8217;ve made lots of progress on the BITX-17. Going counter-clockwise from the lower right, you can see the mic amp, the BFO\/carrier oscillator, the first mixer, the first and second bi-directional amplifiers, the diode ring VXO mixer and the VXO. <\/strong><br \/> <strong><\/strong><br \/> <strong>I plan on building the whole rig (including the power amplifier stages) on this wonderful piece of PC board (thanks to Jim, W8NSA).<\/strong><br \/> <strong><\/strong><br \/> <strong>I had what I thought was the brilliant idea of using LEDs for all the T\/R switching diodes. I thought I&#8217;d use red for receive and blue for transmit. I consulted with the BITX yahoo group and cooler heads prevailed. <\/strong><br \/> <strong><\/strong><br \/> <strong>The design has an LM-386 as the speaker amp. I&#8217;m kind of bothered by this &#8212; I&#8217;d prefer an all-discrete component rig, so I am thinking of building an AF amp with discrete transistors instead, perhaps the circuit from Roger Hayward&#8217;s RX for the Ugly Weekender. What do you all think about this? <\/strong><br \/> <strong><\/strong><br \/> <strong>I&#8217;m having a lot of fun building this rig. If anyone out there is looking for a fall\/winter project, build one of these. <\/strong><br \/> <strong><\/strong><br \/> <strong>I have to order some 5 MHz crystals for the filter and oscillator. Mouser has them at about 70 cents each. <\/strong><\/p>\n<p> Our book: &#8220;SolderSmoke &#8212; Global Adventures in Wireless Electronics&#8221; <a href=\"http:\/\/soldersmoke.com\/book.htm\">http:\/\/soldersmoke.com\/book.htm<\/a> Our coffee mugs, T-Shirts, bumper stickers: <a href=\"http:\/\/www.cafepress.com\/SolderSmoke\">http:\/\/www.cafepress.com\/SolderSmoke<\/a> Our Book Store: <a href=\"http:\/\/astore.amazon.com\/contracross-20\">http:\/\/astore.amazon.com\/contracross-20<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>As you can see (above) I&#8217;ve made lots of progress on the BITX-17. Going counter-clockwise from the lower right, you can see the mic amp, the BFO\/carrier oscillator, the first mixer, the first and second bi-directional amplifiers, the diode ring VXO mixer and the VXO. I plan on building the whole rig (including the power &hellip; <a href=\"https:\/\/www.homebrewradio.us\/blog\/2013\/09\/15\/bitx-build-update-7\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;BITX Build Update # 7&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":2393,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[28,23],"tags":[],"class_list":["post-2392","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-bitx20","category-ssb"],"_links":{"self":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/2392","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/comments?post=2392"}],"version-history":[{"count":1,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/2392\/revisions"}],"predecessor-version":[{"id":2394,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/2392\/revisions\/2394"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media\/2393"}],"wp:attachment":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media?parent=2392"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/categories?post=2392"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/tags?post=2392"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}