{"id":203,"date":"2009-03-01T19:15:18","date_gmt":"2009-03-01T17:15:18","guid":{"rendered":"http:\/\/dh5ym.hopto.org\/wiki\/?p=203"},"modified":"2009-03-01T19:15:18","modified_gmt":"2009-03-01T17:15:18","slug":"whispers-at-shortwave","status":"publish","type":"post","link":"http:\/\/dh5ym.hopto.org\/wiki\/?p=203","title":{"rendered":"Whispers at shortwave&#8230;"},"content":{"rendered":"<p>Usually shortwave is not my favourite area of amateur radio. But inspired by an article from Eike-DM3ML i did some experiments<br \/>\nwith WSPR (weak signal propagation reporting). It is a automatic beaconing network invented by K1JD. It is really exciting to see<br \/>\nlow power stations appear at the display even with a really small receiver antenna. In addition i wrote some software for my<br \/>\nAtmel microcontroller that controlls a small DDS signal generator circuit. With this simple setup it is possible to transmit WSPR beacons<br \/>\nat 5dBm output power. Unfortunately 5dBm are not enougth to be heard by anyone with my small indoor antenna. Maybe i should<br \/>\nbuild an amplifier ;)<\/p>\n<div id=\"attachment_204\" style=\"width: 510px\" class=\"wp-caption aligncenter\"><a rel=\"attachment wp-att-204\" href=\"http:\/\/dh5ym.hopto.org\/wiki\/?attachment_id=204\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-204\" class=\"size-full wp-image-204\" title=\"wspr_20090228\" src=\"..\/wiki\/wp-content\/uploads\/2009\/03\/wspr_20090228.png\" alt=\"WSPR at 80m in JO61\" width=\"500\" height=\"389\" srcset=\"http:\/\/dh5ym.hopto.org\/wiki\/wp-content\/uploads\/2009\/03\/wspr_20090228.png 689w, http:\/\/dh5ym.hopto.org\/wiki\/wp-content\/uploads\/2009\/03\/wspr_20090228-300x233.png 300w, http:\/\/dh5ym.hopto.org\/wiki\/wp-content\/uploads\/2009\/03\/wspr_20090228-624x486.png 624w\" sizes=\"auto, (max-width: 500px) 100vw, 500px\" \/><\/a><p id=\"caption-attachment-204\" class=\"wp-caption-text\">WSPR at 80m in JO61<\/p><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Usually shortwave is not my favourite area of amateur radio. But inspired by an article from Eike-DM3ML i did some experiments with WSPR (weak signal propagation reporting). It is a automatic beaconing network invented by K1JD. It is really exciting &hellip; <a href=\"http:\/\/dh5ym.hopto.org\/wiki\/?p=203\">Continue reading <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2,11],"tags":[],"class_list":["post-203","post","type-post","status-publish","format-standard","hentry","category-amateur-radio","category-microcontroller"],"_links":{"self":[{"href":"http:\/\/dh5ym.hopto.org\/wiki\/index.php?rest_route=\/wp\/v2\/posts\/203","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/dh5ym.hopto.org\/wiki\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/dh5ym.hopto.org\/wiki\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/dh5ym.hopto.org\/wiki\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/dh5ym.hopto.org\/wiki\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=203"}],"version-history":[{"count":0,"href":"http:\/\/dh5ym.hopto.org\/wiki\/index.php?rest_route=\/wp\/v2\/posts\/203\/revisions"}],"wp:attachment":[{"href":"http:\/\/dh5ym.hopto.org\/wiki\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=203"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/dh5ym.hopto.org\/wiki\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=203"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/dh5ym.hopto.org\/wiki\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=203"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}