{"id":731,"date":"2013-04-08T23:28:39","date_gmt":"2013-04-08T21:28:39","guid":{"rendered":"http:\/\/www.dj5ar.de\/?p=731"},"modified":"2017-09-11T21:11:56","modified_gmt":"2017-09-11T20:11:56","slug":"iss-bounce-ii","status":"publish","type":"post","link":"https:\/\/dj5ar.de\/?p=731","title":{"rendered":"ISS bounce II"},"content":{"rendered":"

April 8th, 2013<\/h4>\n

Another test tonight with the experience of the one two days ago, was more efficient in finding the reflections. The ISS passed south of our QTHs. So I could track the whole pass from rise to set. Jan\u00b4s signal could be detected most of the time during his window. The picture shows his signal shortly after the rise of the ISS. Caused by the doppler effect it moves from right to left. The shift in this detail varied between 47 kHz and 38 kHz, while PA3FXB was transmitting on 1296.300 MHz in CW.\u00a0 By a length of about 25 seconds there was a variation of 400 to 500 Hz per second.<\/p>\n

PA3FXB shortly after rise without QRG tracking<\/strong><\/p>\n

\"PA3FXB<\/a>

PA3FXB shortly after rise<\/strong><\/p><\/div>\nhttps:\/\/dj5ar.de\/wp-content\/uploads\/2013\/04\/PA3FXB-2013-04-08-shortly-after-rise-Audio.mp3<\/a><\/audio>\n

PA3FXB shortly after rise with manual QRG tracking<\/strong><\/p>\n

Jan was transmitting his callsign “PA3FXB” followed by “T”s. The variation of the pitch in the first audio file is caused by manually tracking the signal. The second audio file gives an impression of the speed of the doppler variation. An effective\u00a0 compensation of the doppler effect seems to be most important.<\/p>\n

There have been earlier attempts to realize QSOs by reflections on the ISS. SM2CEW<\/a> reports about nearly completing QSOs on 144 MHz with SM7WSJ in 2007 and he tried also with SV3AAF (more<\/a>). DF2ZC<\/a> claims the first ever QSO via ISS scatter on 2 m with DH7FB on December 9, 2007. They completed three more QSOs in 2008. It seems that these were the only four QSOs via ISS bounce since then. VA7MM<\/a> reports about tests on ISS bounce with VE7BBG on 23 cm in 2004. PE1ITR<\/a> tried with DK3WN in 2007.<\/p>\n","protected":false},"excerpt":{"rendered":"

April 8th, 2013 Another test tonight with the experience of the one two days ago, was more efficient in finding the reflections. The ISS passed south of our QTHs. So […]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[180,177],"tags":[30,28,50,8,66,63,65,64],"class_list":["post-731","post","type-post","status-publish","format-standard","hentry","category-iss","category-issbounce","tag-1296-mhz","tag-23-cm","tag-cw","tag-dj5ar","tag-doppler","tag-international-space-station","tag-iss-bounce","tag-pa3fxb"],"_links":{"self":[{"href":"https:\/\/dj5ar.de\/index.php?rest_route=\/wp\/v2\/posts\/731","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dj5ar.de\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dj5ar.de\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dj5ar.de\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/dj5ar.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=731"}],"version-history":[{"count":42,"href":"https:\/\/dj5ar.de\/index.php?rest_route=\/wp\/v2\/posts\/731\/revisions"}],"predecessor-version":[{"id":2807,"href":"https:\/\/dj5ar.de\/index.php?rest_route=\/wp\/v2\/posts\/731\/revisions\/2807"}],"wp:attachment":[{"href":"https:\/\/dj5ar.de\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=731"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dj5ar.de\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=731"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dj5ar.de\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=731"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}