{"id":372,"date":"2015-03-22T11:15:23","date_gmt":"2015-03-22T11:15:23","guid":{"rendered":"http:\/\/localhost\/SM0BRF\/wordpress-3.9.1-sv_SE\/wordpress\/?p=372"},"modified":"2016-03-03T20:01:24","modified_gmt":"2016-03-03T20:01:24","slug":"avstorninga-av-hembioanlaggning","status":"publish","type":"post","link":"https:\/\/www.sm0brf.se\/?p=372","title":{"rendered":"Avst\u00f6rning av &#8221;Hembioanl\u00e4ggning&#8221;"},"content":{"rendered":"<p>En granne skaffade en ny\u00a0 &#8221;Receiver&#8221; av typen SONY\u00a0STR-DN 1050 till sin\u00a0 &#8221;Hembioanl\u00e4ggning&#8221;. Jag h\u00f6rs kraftigt i den vid s\u00e4ndning. En tidigare &#8221;Receiver&#8221; hade inte alls det problemet. Avst\u00e5ndet fr\u00e5n antennerna \u00e4r ungef\u00e4r 80 meter. Uppskattad f\u00e4ltstyrka \u00e4r klart under 3 V\/m. St\u00f6rningen h\u00f6rdes i &#8221;Surroundh\u00f6gtalarna&#8221; dit de l\u00e4ngsta kablarna gick. De h\u00f6gtalarkablarna lindades 5 varv i en FT-240-77 ferritk\u00e4rna fr\u00e5n Amidon. Samtidigt kopplades en skarvsladd in mellan v\u00e4gguttag och samtliga enheter. Den var ocks\u00e5 lindad 5 varv p\u00e5 en likadan k\u00e4rna. St\u00f6rningarna var kvar, men hade \u00e4ndrat karakt\u00e4r. Vid prov att koppla fr\u00e5n kabeln till TV-antennen f\u00f6rsvann st\u00f6rningen. En kabel med en galvanisk isolator kopplades in i antennledningen (<em>anm 1<\/em>). Det \u00e5terstod en svag st\u00f6rning. Vid kontakt med SONY support s\u00e4ger dom bara att receivern ska \u00e5terst\u00e4llas till fabriksinst\u00e4llningarna. Hur det ska kunna f\u00e5 bort EMC-problemet har de inte kunnat f\u00f6rklara.<\/p>\n<p>Ett filter f\u00f6r h\u00f6gtalarledningarna ska tillverkas.<\/p>\n<p>M\u00e4tningar gjordes p\u00e5 en koppling enligt figur 1.<\/p>\n<p><a href=\"https:\/\/www.sm0brf.se\/wp-content\/uploads\/2015\/03\/hogtalarfilter1-1024x374.jpg\" rel=\"attachment wp-att-592\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-592\" src=\"https:\/\/www.sm0brf.se\/wp-content\/uploads\/2015\/03\/hogtalarfilter1-1024x374-300x110.jpg\" alt=\"hogtalarfilter1-1024x374\" width=\"300\" height=\"110\" srcset=\"https:\/\/www.sm0brf.se\/wp-content\/uploads\/2015\/03\/hogtalarfilter1-1024x374-300x110.jpg 300w, https:\/\/www.sm0brf.se\/wp-content\/uploads\/2015\/03\/hogtalarfilter1-1024x374-768x281.jpg 768w, https:\/\/www.sm0brf.se\/wp-content\/uploads\/2015\/03\/hogtalarfilter1-1024x374.jpg 1024w, https:\/\/www.sm0brf.se\/wp-content\/uploads\/2015\/03\/hogtalarfilter1-1024x374-624x228.jpg 624w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>Fig.1<\/p>\n<p>Filtret best\u00e5r av 7 ferritk\u00e4rnor FT-140-77 lindade med ca 2&#215;1 meter lackerad 1 mm koppartr\u00e5d. En drossel f\u00f6r varje h\u00f6gtalare. Det blev ca 21 varv. Subwoofern ansluts med speciell kabel, s\u00e5 den f\u00e5r lindas p\u00e5 en stor FT-240-77-k\u00e4rna.<\/p>\n<p><a href=\"https:\/\/www.sm0brf.se\/wp-content\/uploads\/2015\/03\/DSC00583.jpg\" rel=\"attachment wp-att-608\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-608\" src=\"https:\/\/www.sm0brf.se\/wp-content\/uploads\/2015\/03\/DSC00583-300x225.jpg\" alt=\"DSC00583\" width=\"300\" height=\"225\" srcset=\"https:\/\/www.sm0brf.se\/wp-content\/uploads\/2015\/03\/DSC00583-300x225.jpg 300w, https:\/\/www.sm0brf.se\/wp-content\/uploads\/2015\/03\/DSC00583-768x576.jpg 768w, https:\/\/www.sm0brf.se\/wp-content\/uploads\/2015\/03\/DSC00583-1024x768.jpg 1024w, https:\/\/www.sm0brf.se\/wp-content\/uploads\/2015\/03\/DSC00583-624x468.jpg 624w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p><a href=\"https:\/\/www.sm0brf.se\/wp-content\/uploads\/2015\/03\/DSC00587.jpg\" rel=\"attachment wp-att-609\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-medium wp-image-609\" src=\"https:\/\/www.sm0brf.se\/wp-content\/uploads\/2015\/03\/DSC00587-300x225.jpg\" alt=\"DSC00587\" width=\"300\" height=\"225\" srcset=\"https:\/\/www.sm0brf.se\/wp-content\/uploads\/2015\/03\/DSC00587-300x225.jpg 300w, https:\/\/www.sm0brf.se\/wp-content\/uploads\/2015\/03\/DSC00587-768x576.jpg 768w, https:\/\/www.sm0brf.se\/wp-content\/uploads\/2015\/03\/DSC00587-1024x768.jpg 1024w, https:\/\/www.sm0brf.se\/wp-content\/uploads\/2015\/03\/DSC00587-624x468.jpg 624w\" sizes=\"auto, (max-width: 300px) 100vw, 300px\" \/><\/a><\/p>\n<p>Uppm\u00e4tta data.<\/p>\n<p>Frekvens MHz\u00a0\u00a0 U1 Volt t-t \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 U2 Volt t-t \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 D\u00e4mpning dB<\/p>\n<p>1,8\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 37\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0,2\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 46<\/p>\n<p>3,5\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 38\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0,25\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 44<\/p>\n<p>7,0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 37\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0,23\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 42<\/p>\n<p>10,1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 38\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0,28\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 43<\/p>\n<p>14,1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 38\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1,1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 31<\/p>\n<p>18,1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 34\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1,1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 30<\/p>\n<p>21,1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 30\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1,2\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 28<\/p>\n<p>24,9\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 25\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 1,1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 27<\/p>\n<p>28,1\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 23\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 0,37\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0 36<\/p>\n<p>&nbsp;<\/p>\n<p>F\u00f6rs\u00f6k gjordes f\u00f6r att hitta s\u00e4msta m\u00f6jliga d\u00e4mpning inom frekvensomr\u00e5det. Det gjordes genom att variera frekvensen och belastningsimpedansen vid U2. Impedansen vid U1 h\u00f6lls hela tiden till 50 ohm. Minsta d\u00e4mpning uppm\u00e4ttes vid 25 MHz till 20 dB.<\/p>\n<p>F\u00f6r att minimera risken f\u00f6r serieresonanser har \u00e4ven drosslar med ned till 5 varv provats, men d\u00e4mpningen har \u00f6ver lag varit mycket s\u00e4mre. Man f\u00e5r f\u00f6rmoda att f\u00f6rluster i k\u00e4rnmaterialet \u00e4r viktiga f\u00f6r d\u00e4mpningen vilket \u00e4r viktigt i den skarpa uppkopplingen i en odefinierad h\u00f6gtalarledning med en ok\u00e4nd impedans i f\u00f6rst\u00e4rkarens utg\u00e5ngssteg.<\/p>\n<p>&nbsp;<\/p>\n<p>Anm 1: Det visade sig senare att d\u00e4mpningen av common mode-str\u00f6mmar med den galvaniska skiljaren var mycket l\u00e5g p\u00e5 kortv\u00e5g, ca 5 dB. D\u00e4rf\u00f6r lindades en antennskarvsladd genom en ferrittoroid och seriekopplades med antennen.<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>En granne skaffade en ny\u00a0 &#8221;Receiver&#8221; av typen SONY\u00a0STR-DN 1050 till sin\u00a0 &#8221;Hembioanl\u00e4ggning&#8221;. Jag h\u00f6rs kraftigt i den vid s\u00e4ndning. En tidigare &#8221;Receiver&#8221; hade inte alls det problemet. Avst\u00e5ndet fr\u00e5n antennerna \u00e4r ungef\u00e4r 80 meter. Uppskattad f\u00e4ltstyrka \u00e4r klart under 3 V\/m. St\u00f6rningen h\u00f6rdes i &#8221;Surroundh\u00f6gtalarna&#8221; dit de l\u00e4ngsta kablarna gick. De h\u00f6gtalarkablarna lindades 5 [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[15],"tags":[],"class_list":["post-372","post","type-post","status-publish","format-standard","hentry","category-storningar-sv"],"_links":{"self":[{"href":"https:\/\/www.sm0brf.se\/index.php?rest_route=\/wp\/v2\/posts\/372","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.sm0brf.se\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.sm0brf.se\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.sm0brf.se\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.sm0brf.se\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=372"}],"version-history":[{"count":8,"href":"https:\/\/www.sm0brf.se\/index.php?rest_route=\/wp\/v2\/posts\/372\/revisions"}],"predecessor-version":[{"id":718,"href":"https:\/\/www.sm0brf.se\/index.php?rest_route=\/wp\/v2\/posts\/372\/revisions\/718"}],"wp:attachment":[{"href":"https:\/\/www.sm0brf.se\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=372"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.sm0brf.se\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=372"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.sm0brf.se\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=372"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}