{"id":8951,"date":"2020-11-30T11:31:00","date_gmt":"2020-11-30T00:31:00","guid":{"rendered":"https:\/\/www.homebrewradio.us\/blog\/2020\/11\/30\/adam-n0zibs-direct-conversion-transceiver\/"},"modified":"2025-07-22T01:40:42","modified_gmt":"2025-07-21T15:40:42","slug":"adam-n0zibs-direct-conversion-transceiver","status":"publish","type":"post","link":"https:\/\/www.homebrewradio.us\/blog\/2020\/11\/30\/adam-n0zibs-direct-conversion-transceiver\/","title":{"rendered":"Adam N0ZIB’s Direct Conversion Transceiver"},"content":{"rendered":"<\/p>\n
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This is obviously very cool, but looking ahead I think Adam should think about adding one more mixer, changing the bias on the TX amps, and adding a mic amp. Boom: A Double Sideband Transceiver. <\/b><\/span><\/i><\/p>\n

Pete wrote: When I was in the US Navy and a particular unit did something outstanding \u2013 the Command ship would raise the Bravo Zulu Flag for a job well. Don\u2019t know if you can see it there in MO but I have raised the BZ flag to you. Outstanding and congratulations.<\/span><\/b><\/span><\/i><\/p>\n

Bill and Pete: <\/b><\/p>\n

Just finished a DC transceiver using Arduino nano, SI5351 (my sincerest apologies, Bill), diode ring mixer and lm386 audio amp. The transmit portion is a two-stage class AB pre-amp (from EMRFD page 2.32), which is driving an IRF510 final (biased at 2.08 volts) from Pete\u2019s design. Output is about 5watts into a CWAZ low pass filter, based on the design from here: <\/span>https:\/\/www.arrl.org\/files\/file\/Technology\/tis\/info\/pdf\/9902044.pdf<\/a><\/b><\/p>\n

I\u2019m using a manual TX\/RX switch which is doing multiple things. It brings the Nano A1 LOW, offsetting the transmit frequency 600 Hz for CW, grounds the audio input to prevent deafness (learned that one the hard way), and it engages a relay that switches the antenna from the receiver to the transmit, and also turns on the transmitter stages. Keying is through the first stage of the pre-amp. <\/span>
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<\/span>I still have some tidying up to do, and I\u2019m not sure the LPF works so well using two component inductors instead of all toroids, but I finished it today and made my first QSO into Ontario almost 1000 miles away. It\u2019s been great fun! <\/span>
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<\/span>73,<\/span>
<\/span>Adam<\/span>
<\/span>N0ZIB<\/span>
<\/span>Missouri<\/span><\/b><\/p><\/blockquote>\n

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This is obviously very cool, but looking ahead I think Adam should think about adding one more mixer, changing the bias on the TX amps, and adding a mic amp. Boom: A Double Sideband Transceiver. Pete wrote: When I was in the US Navy and a particular unit did something outstanding \u2013 the Command ship … Continue reading “Adam N0ZIB’s Direct Conversion Transceiver”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":8952,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[67,116,35,33,94,16,41,61],"tags":[],"class_list":["post-8951","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-arduino","category-cw","category-direct-conversion","category-dsb","category-emrfd","category-filters","category-juliano-pete","category-si5351"],"_links":{"self":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/8951","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=8951"}],"version-history":[{"count":1,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/8951\/revisions"}],"predecessor-version":[{"id":8955,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/8951\/revisions\/8955"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media\/8952"}],"wp:attachment":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media?parent=8951"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/categories?post=8951"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/tags?post=8951"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}