{"id":3521,"date":"2016-09-09T10:13:00","date_gmt":"2016-09-09T00:13:00","guid":{"rendered":"https:\/\/www.homebrewradio.us\/blog\/2016\/09\/09\/oz-joo-an-australian-mighty-mite-with-3d-printing\/"},"modified":"2025-07-21T15:37:50","modified_gmt":"2025-07-21T05:37:50","slug":"oz-joo-an-australian-mighty-mite-with-3d-printing","status":"publish","type":"post","link":"https:\/\/www.homebrewradio.us\/blog\/2016\/09\/09\/oz-joo-an-australian-mighty-mite-with-3d-printing\/","title":{"rendered":"Oz JOO : An Australian Mighty Mite with 3D Printing"},"content":{"rendered":"
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<\/b><\/span> Hi Bill & Pete,<\/b><\/span> <\/p>\n

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I have the JOO – joy of oscillation! The transistor is a 2N3053 with a clip on heat sink, but I don’t think that I really need it. Output power +22dBm or 160mW. When I tested it on a Comms test set at work, I found that the harmonics were about 12dB to 15dB down and I stopped looking at the 10th harmonic. Not good.<\/b><\/div>\n
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Fitting the 80m low pass filter (salvaged from another project) brought the harmonics more than 50dB down.<\/b><\/div>\n
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The coil former is a 31mm diameter and 3D printed by one of the guys at work. The material is PET – the material they make soft drink bottles from. After we printed it, I put it in a microwave oven with a glass of water. 30 seconds and the water got warm and the coil former stayed cool.<\/b><\/div>\n
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I haven’t had a contact yet, but maybe in the next few weeks.<\/b><\/div>\n
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The next project is an 80m CW transmitter based upon the Goodfeller transmitter from QST 1946. It requires a inductor in the pi coupler, 1.5 inch diameter, 32 turns at 20 tip; but where to get one of those these days – wind your own.<\/b><\/div>\n
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I got the guy at work to also 3D print me a coil former with a spiral thread around the outside with a 20tpi pitch for the wire to lay in. Some hot glue and the coil is ready.<\/b><\/div>\n
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Now that I have finished all 189 episodes and two specials, my days are empty. Please make some more.<\/b><\/div>\n
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73 de Peter VK2EMU<\/b><\/div>\n

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Hi Peter (great name BTW),<\/b><\/div>\n
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Congratulations \u2013really liked your build \u2013 top drawer! 3D printer access WOW \u2013 now if I could only get my 3rd son (Mechanical Engineer) to build me one of those machines. <\/b><\/div>\n
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The 3D made coil form is perfect for a VFO and follows the principles set down by Doug DeMaw W1FB (SK) about keeping the coil supported at both ends and away from metal. Bill needs a coil like that to mate with his HRO dial mechanism \u2013and follows something old (dial) something new (coil).<\/b><\/div>\n
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73\u2019s<\/b><\/div>\n
Pete N6QW<\/b><\/i><\/u><\/sub><\/sup><\/strike><\/div>\n<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"

Hi Bill & Pete, I have the JOO – joy of oscillation! The transistor is a 2N3053 with a clip on heat sink, but I don’t think that I really need it. Output power +22dBm or 160mW. When I tested it on a Comms test set at work, I found that the harmonics were about … Continue reading “Oz JOO : An Australian Mighty Mite with 3D Printing”<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":3522,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[29,41,24],"tags":[],"class_list":["post-3521","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-australia","category-juliano-pete","category-michigan-mighty-mite"],"_links":{"self":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/3521","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=3521"}],"version-history":[{"count":1,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/3521\/revisions"}],"predecessor-version":[{"id":3524,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/posts\/3521\/revisions\/3524"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media\/3522"}],"wp:attachment":[{"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/media?parent=3521"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/categories?post=3521"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.homebrewradio.us\/blog\/wp-json\/wp\/v2\/tags?post=3521"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}