{"id":527,"date":"2017-02-08T10:48:44","date_gmt":"2017-02-08T10:48:44","guid":{"rendered":"http:\/\/www.nerorockets.nl\/?p=527"},"modified":"2017-02-08T10:50:21","modified_gmt":"2017-02-08T10:50:21","slug":"spectrum-analysis-of-talky-gps-transponder","status":"publish","type":"post","link":"https:\/\/www.nerorockets.nl\/2017\/02\/08\/spectrum-analysis-of-talky-gps-transponder\/","title":{"rendered":"Spectrum Analysis of Talky GPS transponder"},"content":{"rendered":"<p>The DRA818U radio module is known to produce harmonics at higher frequencies. To avoid problems with other radio equipment a low pass filter was installed in the latest version of the Talky GPS transponder.<\/p>\n<p>To check the efficiency of the filter, a spectrum analysis was performed. Tx power at the ground frequency was unaffected (1 Watt) while the harmonic was reduced from 2.2 milliWatt to 13 microWatt.<\/p>\n<p><a href=\"http:\/\/www.nerorockets.nl\/wp-content\/uploads\/2017\/02\/screenshots.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-large wp-image-536\" src=\"http:\/\/www.nerorockets.nl\/wp-content\/uploads\/2017\/02\/screenshots.jpg?w=676\" alt=\"screenshots\" width=\"676\" height=\"268\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>The DRA818U radio module is known to produce harmonics at higher frequencies. To avoid problems with other radio equipment a low pass filter was installed in the latest version of the Talky GPS transponder. To check the efficiency of the filter, a spectrum analysis was performed. Tx power at the ground frequency was unaffected (1 &hellip; <a href=\"https:\/\/www.nerorockets.nl\/2017\/02\/08\/spectrum-analysis-of-talky-gps-transponder\/\" class=\"more-link\">Continue reading <span class=\"screen-reader-text\">Spectrum Analysis of Talky GPS transponder<\/span><\/a><\/p>\n","protected":false},"author":33612631,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-527","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/www.nerorockets.nl\/wp-json\/wp\/v2\/posts\/527","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.nerorockets.nl\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.nerorockets.nl\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.nerorockets.nl\/wp-json\/wp\/v2\/users\/33612631"}],"replies":[{"embeddable":true,"href":"https:\/\/www.nerorockets.nl\/wp-json\/wp\/v2\/comments?post=527"}],"version-history":[{"count":0,"href":"https:\/\/www.nerorockets.nl\/wp-json\/wp\/v2\/posts\/527\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.nerorockets.nl\/wp-json\/wp\/v2\/media?parent=527"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.nerorockets.nl\/wp-json\/wp\/v2\/categories?post=527"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.nerorockets.nl\/wp-json\/wp\/v2\/tags?post=527"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}