{"id":42,"date":"2013-03-03T11:53:19","date_gmt":"2013-03-03T11:53:19","guid":{"rendered":"http:\/\/www.sevenwatt.com\/main\/?p=42"},"modified":"2013-03-03T11:53:19","modified_gmt":"2013-03-03T11:53:19","slug":"unidentified-868mhz-ook-signals","status":"publish","type":"post","link":"https:\/\/www.sevenwatt.com\/main\/unidentified-868mhz-ook-signals\/","title":{"rendered":"Unidentified 868MHz OOK signals"},"content":{"rendered":"<p>In my attempts to receive weather stations on the 868MHz band, without exact knowledge on for example transmission frequencies, I have performed sweeps of frequency range 867.850 &#8211; 869.000 MHz in steps of 20kHz. In the loggings I have been looking for periodic signal. Using a histogram of pulse durations, both on and off durations, I was able to recognize signatures of signals. This approach led to the identification of the following signals:<\/p>\n<ul>\n<li><span style=\"line-height: 14px;\">Two Alecto WS4000 or similar weather stations.<\/span><\/li>\n<li>An Oregon Scientific THN128 433MHz, received at 868MHz band.<\/li>\n<li>A Philips outdoor temperature sensor for Philips clock radios, also a 433MHz module<\/li>\n<\/ul>\n<p><span style=\"line-height: 24px;\">Besides those identified signals, I have several unidentified periodic signals, many with a periodicity of around or exact 30 seconds. I have created some signal <a title=\"OOK signals\" href=\"http:\/\/www.sevenwatt.com\/signals\" target=\"_blank\">catalogue<\/a> for my own reference, but any help on those signals is appreciated. send me a message on info at sevenwatt com.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>In my attempts to receive weather stations on the 868MHz band, without exact knowledge on for example transmission frequencies, I have performed sweeps of frequency range 867.850 &#8211; 869.000 MHz in steps of 20kHz. In the loggings I have been looking for periodic signal. Using a histogram of pulse durations, both on and off durations, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[1],"tags":[6,58,9],"class_list":["post-42","post","type-post","status-publish","format-standard","hentry","category-weatherstations","tag-868mhz","tag-ook","tag-weather-station"],"_links":{"self":[{"href":"https:\/\/www.sevenwatt.com\/main\/wp-json\/wp\/v2\/posts\/42","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.sevenwatt.com\/main\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.sevenwatt.com\/main\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.sevenwatt.com\/main\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.sevenwatt.com\/main\/wp-json\/wp\/v2\/comments?post=42"}],"version-history":[{"count":2,"href":"https:\/\/www.sevenwatt.com\/main\/wp-json\/wp\/v2\/posts\/42\/revisions"}],"predecessor-version":[{"id":44,"href":"https:\/\/www.sevenwatt.com\/main\/wp-json\/wp\/v2\/posts\/42\/revisions\/44"}],"wp:attachment":[{"href":"https:\/\/www.sevenwatt.com\/main\/wp-json\/wp\/v2\/media?parent=42"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.sevenwatt.com\/main\/wp-json\/wp\/v2\/categories?post=42"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.sevenwatt.com\/main\/wp-json\/wp\/v2\/tags?post=42"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}