{"id":3822,"date":"2017-01-12T10:24:00","date_gmt":"2017-01-11T23:24:00","guid":{"rendered":"https:\/\/www.homebrewradio.us\/blog\/2017\/01\/12\/n6orss-franken-sdr-superhet\/"},"modified":"2025-07-21T16:09:16","modified_gmt":"2025-07-21T06:09:16","slug":"n6orss-franken-sdr-superhet","status":"publish","type":"post","link":"https:\/\/www.homebrewradio.us\/blog\/2017\/01\/12\/n6orss-franken-sdr-superhet\/","title":{"rendered":"N6ORS’s Franken-SDR Superhet"},"content":{"rendered":"
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Of course, I love it. MOSFETS! NE602’s! 10.7 Mc IF cans! Cycles, not hertz! And a Tayloe Quadrature Sampling Detector made from junkbox parts from the Reagan administration. FB Keith. And the frequency display is icing on the cake.<\/span><\/i> <\/b><\/p>\n

Bill: <\/b>

<\/b> I thought the group might find my new Franken-SDR interesting.
It is an SDR with a superhet front end. <\/b>
<\/b>
I wanted to play with an SDR but I didn’t want to get a kit or buy
parts, so I scrounged through he drawers and found a mux chip
cd-4016 circa-1980 some old 7400 logic that is probably per-1980.
This could make a QSD but only very low frequencies. Well I thought
how about at IF frequencies?<\/b>
<\/b>
The frontend is a MOSFET mixer (1975) , the 10.7 IF is a dual gate MOSFET
(1975), the second mixer is a NE602, the IF cans are all stagger tuned to
give a bandwidth of 50kcs.
The only thing modern is the DDS but I old-time-ifyed it with BCD switches.<\/b>

<\/b> Keith N6ORS<\/b><\/span>

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VK6FTH did something similar: <\/b>http:\/\/www.vk6fh.com\/vk6fh\/SDRradio.htm<\/b><\/a><\/div>\n
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Of course, I love it. MOSFETS! NE602’s! 10.7 Mc IF cans! Cycles, not hertz! And a Tayloe Quadrature Sampling Detector made from junkbox parts from the Reagan administration. FB Keith. And the frequency display is icing on the cake. Bill: I thought the group might find my new Franken-SDR interesting. It is an SDR with … Continue reading “N6ORS’s Franken-SDR Superhet”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":3823,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[137,40,57],"tags":[],"class_list":["post-3822","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-dds","category-sdr","category-superhet-receivers"],"_links":{"self":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/3822","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=3822"}],"version-history":[{"count":1,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/3822\/revisions"}],"predecessor-version":[{"id":3827,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/3822\/revisions\/3827"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media\/3823"}],"wp:attachment":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media?parent=3822"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/categories?post=3822"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/tags?post=3822"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}