{"id":350,"date":"2002-08-20T19:00:45","date_gmt":"2002-08-20T17:00:45","guid":{"rendered":"http:\/\/pa3hcm.utreg.net\/?p=350"},"modified":"2021-01-18T20:21:24","modified_gmt":"2021-01-18T19:21:24","slug":"my-first-transmitter","status":"publish","type":"post","link":"https:\/\/www.pa3hcm.nl\/?p=350","title":{"rendered":"Your first transmitter"},"content":{"rendered":"\n<div class=\"wp-block-image\"><figure class=\"alignright\"><a href=\"http:\/\/pa3hcm.utreg.net\/wp-content\/uploads\/2014\/01\/my1sttx.jpg\"><img loading=\"lazy\" decoding=\"async\" width=\"220\" height=\"160\" src=\"http:\/\/pa3hcm.utreg.net\/wp-content\/uploads\/2014\/01\/my1sttx.jpg\" alt=\"my1sttx\" class=\"wp-image-351\"\/><\/a><\/figure><\/div>\n\n\n\n<p>With just a few components, you can make your own morse code transmitter. The output is only a few miliwatts, but this is enough to receive on any radio in your home.<\/p>\n\n\n\n<p>In fact, it is only a simple Clapp Oscillator with the output directly driven into a few meters of wire. The transmitting frequency depends on the used crystal. This may be any crystal between 1 and 15 MHz, higher frequencies may perhaps work also, therefore you may lower the 2 capacitors a little bit.<\/p>\n\n\n\n<p>The transmitting frequency is not only the one shown on the crystal, but also &#8220;harmonics&#8221;: If you have for example a crystal of 3.56 MHz, then it transmits (of course) on 3.56 MHz, but also a bit at 7.12 MHz (2 * 3.56), 10.68 MHz (3 * 3.56), 14.24 MHz (4 * 3.56), etc.<\/p>\n\n\n\n<p>The operating voltage is not critical, a 9 volt battery will do the job.<\/p>\n\n\n\n<p>Components:<\/p>\n\n\n\n<ul class=\"wp-block-list\"><li>C1 &#8211; 100 picofarad<\/li><li>C2 &#8211; 100 picofarad<\/li><li>R1 &#8211; 10 kilo-ohm<\/li><li>R2 &#8211; 1 kilo-ohm<\/li><li>S1 &#8211; Morse key or switch<\/li><li>T1 &#8211; BC547 or any other universal NPN transistor<\/li><li>X1 &#8211; Any crystal you like between 1-15 MHz<\/li><\/ul>\n","protected":false},"excerpt":{"rendered":"<p>With just a few components, you can make your own morse code transmitter. The output is only a few miliwatts, but this is enough to receive on any radio in your home. In fact, it is only a simple Clapp Oscillator with the output directly driven into a few meters of wire. The transmitting frequency [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":351,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14],"tags":[25,27,28,30,26],"class_list":["post-350","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-transmitters_and_receivers","tag-80m","tag-beginners","tag-cw","tag-qrp","tag-transmitter"],"blocksy_meta":{"styles_descriptor":{"styles":{"desktop":"","tablet":"","mobile":""},"google_fonts":[],"version":6}},"_links":{"self":[{"href":"https:\/\/www.pa3hcm.nl\/index.php?rest_route=\/wp\/v2\/posts\/350","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.pa3hcm.nl\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.pa3hcm.nl\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.pa3hcm.nl\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.pa3hcm.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=350"}],"version-history":[{"count":7,"href":"https:\/\/www.pa3hcm.nl\/index.php?rest_route=\/wp\/v2\/posts\/350\/revisions"}],"predecessor-version":[{"id":1966,"href":"https:\/\/www.pa3hcm.nl\/index.php?rest_route=\/wp\/v2\/posts\/350\/revisions\/1966"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.pa3hcm.nl\/index.php?rest_route=\/wp\/v2\/media\/351"}],"wp:attachment":[{"href":"https:\/\/www.pa3hcm.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=350"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.pa3hcm.nl\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=350"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.pa3hcm.nl\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=350"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}