{"id":300,"date":"2016-02-13T11:40:00","date_gmt":"2016-02-13T00:40:00","guid":{"rendered":"https:\/\/www.homebrewradio.us\/blog\/2016\/02\/13\/zl2ctms-teensy-sdr-ssb-superhet-very-cool\/"},"modified":"2016-02-13T11:40:00","modified_gmt":"2016-02-13T00:40:00","slug":"zl2ctms-teensy-sdr-ssb-superhet-very-cool","status":"publish","type":"post","link":"https:\/\/www.homebrewradio.us\/blog\/2016\/02\/13\/zl2ctms-teensy-sdr-ssb-superhet-very-cool\/","title":{"rendered":"ZL2CTM&#8217;s Teensy SDR SSB Superhet &#8212; Very Cool"},"content":{"rendered":"<p><iframe loading=\"lazy\" allowfullscreen=\"\" frameborder=\"0\" height=\"248\" src=\"https:\/\/www.youtube.com\/embed\/9-rA-VAdrZA?rel=0\" width=\"440\"><\/iframe><\/p>\n<p> <b>Hi Bill<\/b><br \/> <b><br \/><\/b> <b>I thought I would drop you a quick line to show you something I have been playing around with for the past couple of weeks. It&#8217;s a SSB superhet using a PJRC Teensy 3.1 microcontroller (YouTube link below), and a great audio library by Paul Stroffregen. Suffice to say I&#8217;m really happy with it.<\/b> <\/p>\n<div id=\"yui_3_16_0_1_1455333091304_2810\"> <b><\/b><\/div>\n<div id=\"yui_3_16_0_1_1455333091304_2657\">\n<div id=\"yui_3_16_0_1_1455333091304_2656\"> <b>There is a direct conversion front end, albeit using a VFO 15kHz down from the incoming RF. The 15kHz IF is then fed into the Teensy audio line in which can handle up to 22kHz. From there everything is in software. First is a 2.4kHz BPF tuned to the LSB, followed by mixer with a 15kHz BFO. Finally, there is a 2.4kHz LPF. Next step is to add both CW-wide and CW-narrow filters which can be selected during run time.<\/b><\/div>\n<div id=\"yui_3_16_0_1_1455333091304_2716\"> <b><\/b><\/div>\n<div id=\"yui_3_16_0_1_1455333091304_2715\"> <b>As you can tell from the video, my antenna is not the best and I have quite a bit of QRM in the shack. I really need to think about a better antenna, but that&#8217;s another story.<\/b><\/div>\n<div id=\"yui_3_16_0_1_1455333091304_2815\"> <b><\/b><\/div>\n<div> <a href=\"https:\/\/youtu.be\/9-rA-VAdrZA\" id=\"yui_3_16_0_1_1455333091304_2662\" rel=\"noreferrer\" target=\"_blank\"><b>https:\/\/youtu.be\/9-rA-VAdrZA<\/b><\/a><\/div>\n<div> <b><\/b><\/div>\n<div> <b>I have been following your R2 endeavors with interest, and as I said to Pete I will attempt to replicate the R2 on a Teensy. I will try and use the divide by 2 arrangement you tried as the logic looks right. <\/b><\/p>\n<div> <span style=\"font-size: 12.8px;\"><br \/><\/span><\/div>\n<div> <b>I will also be adding in a transmitter. For that I&#8217;ll use the microphone input and then take the audio from the line out straight to the RF pre\/power amp.<\/b> <\/div>\n<\/p><\/div>\n<div> <b><br \/><\/b><\/div>\n<div> <b>I must admit that I really enjoy homebrewing hardware\/software hybrids as you get the best of both worlds. As i say that, I wonder how much ADCs cost these days to directly digitize RF&#8230; Now that would be interesting.<\/b><\/div>\n<div> <b><br \/><\/b><\/div>\n<div> <b>I&#8217;ll say again that I really enjoy following the podcast. I have loved electronics since I was a small boy when my parents bought me a battery, switch and light bulb. This age of cheap DDSs, microcontrollers and the like is amazing, and I get so much enjoyment putting them all together to make functioning ham radios. I hope more get into the homebrew field as the entry barrier is dropping fast. <\/b><\/div>\n<div id=\"yui_3_16_0_1_1455333091304_2926\"> <b><br \/><\/b><\/div>\n<div> <b>Keep up the good work.<\/b><\/div>\n<\/p><\/div>\n<div id=\"yui_3_16_0_1_1455333091304_2819\"> <b>73s<\/b><\/div>\n<div>\n<div id=\"yui_3_16_0_1_1455333091304_2818\"> <a href=\"https:\/\/lh5.googleusercontent.com\/-AAcAQpDQb48\/UUiUrzoJLMI\/AAAAAAAAADI\/utTpPy9ctlM\/w518-h517-no\/Charles%2BMorris.JPG\" imageanchor=\"1\" style=\"clear: right; float: right; margin-bottom: 1em; margin-left: 1em;\"><\/a><b>Charlie<\/b><\/div>\n<div id=\"yui_3_16_0_1_1455333091304_2873\"> <b>ZL2CTM<\/b><\/div>\n<div class=\"separator\" style=\"clear: both; text-align: center;\"> <a href=\"https:\/\/lh5.googleusercontent.com\/-AAcAQpDQb48\/UUiUrzoJLMI\/AAAAAAAAADI\/utTpPy9ctlM\/w518-h517-no\/Charles%2BMorris.JPG\" imageanchor=\"1\" style=\"margin-left: 1em; margin-right: 1em;\"><img loading=\"lazy\" decoding=\"async\" border=\"0\" class=\"HAa Eha\" height=\"318\" src=\"https:\/\/lh5.googleusercontent.com\/-AAcAQpDQb48\/UUiUrzoJLMI\/AAAAAAAAADI\/utTpPy9ctlM\/w518-h517-no\/Charles%2BMorris.JPG\" width=\"320\" \/><\/a><\/div>\n<div><\/div>\n<div> <b><br \/><\/b><\/div>\n<div> <b><br \/><\/b><\/div>\n<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Hi Bill I thought I would drop you a quick line to show you something I have been playing around with for the past couple of weeks. It&#8217;s a SSB superhet using a PJRC Teensy 3.1 microcontroller (YouTube link below), and a great audio library by Paul Stroffregen. Suffice to say I&#8217;m really happy with &hellip; <a href=\"https:\/\/www.homebrewradio.us\/blog\/2016\/02\/13\/zl2ctms-teensy-sdr-ssb-superhet-very-cool\/\" class=\"more-link\">Continue reading<span class=\"screen-reader-text\"> &#8220;ZL2CTM&#8217;s Teensy SDR SSB Superhet &#8212; Very Cool&#8221;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[67,103,127,54,40],"tags":[],"class_list":["post-300","post","type-post","status-publish","format-standard","hentry","category-arduino","category-knack-stories","category-new-zealand","category-phasing-rigs","category-sdr"],"_links":{"self":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/300","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=300"}],"version-history":[{"count":0,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/300\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media?parent=300"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/categories?post=300"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/tags?post=300"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}