{"id":1130,"date":"2017-12-23T21:41:09","date_gmt":"2017-12-23T20:41:09","guid":{"rendered":"http:\/\/www.sm0brf.se\/?p=1130"},"modified":"2017-12-31T10:53:39","modified_gmt":"2017-12-31T09:53:39","slug":"dl-1000-som-antenntrad-hur-stora-blir-forlusterna","status":"publish","type":"post","link":"https:\/\/www.sm0brf.se\/?p=1130","title":{"rendered":"DL-1000 som antenntr\u00e5d. Hur stora blir f\u00f6rlusterna?"},"content":{"rendered":"<p>2017-12-23<\/p>\n<p>M\u00e4tningar gjordes p\u00e5 en dipol f\u00f6r 20 m. Som referens anv\u00e4ndes FK 1,5. F\u00f6rutom DL 1000 m\u00e4ttes f\u00f6rlusterna p\u00e5 1 mm plastisolerad mjuk st\u00e5ltr\u00e5d.<\/p>\n<p>DL 1000 hade 0,85 dB st\u00f6rre f\u00f6rluster \u00e4n FK 1,5 och st\u00e5ltr\u00e5den 2,3 dB st\u00f6rre f\u00f6rluster.<\/p>\n<p>Detaljer kan studeras under &#8221;Antenner&#8221;:<\/p>\n<blockquote class=\"wp-embedded-content\" data-secret=\"h60q8RZlzQ\"><p><a href=\"https:\/\/www.sm0brf.se\/?p=1133\">DL-1000 som antenntr\u00e5d. Hur stora blir f\u00f6rlusterna?<\/a><\/p><\/blockquote>\n<p><iframe loading=\"lazy\" class=\"wp-embedded-content\" sandbox=\"allow-scripts\" security=\"restricted\" style=\"position: absolute; visibility: hidden;\" title=\"&#8220;DL-1000 som antenntr\u00e5d. Hur stora blir f\u00f6rlusterna?&#8221; &#8212; A site about HAM radio\" src=\"https:\/\/www.sm0brf.se\/?p=1133&#038;embed=true#?secret=noUYYYDKaV#?secret=h60q8RZlzQ\" data-secret=\"h60q8RZlzQ\" width=\"600\" height=\"338\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\"><\/iframe><\/p>\n<p>&nbsp;<\/p>\n<p>Nu har jag simulerat vad som h\u00e4nder med en LW p\u00e5 100 meter p\u00e5 14 MHz.<\/p>\n<p>N\u00e4r jag m\u00e4tte p\u00e5 en dipol \u00f6kade matningsimpedansen med ca 12 ohm n\u00e4r jag anv\u00e4nde DL1000 i st\u00e4llet f\u00f6r FK 1,5. Det betyder att ett f\u00f6rlustmotst\u00e5nd p\u00e5 12 ohm ligger i serie med matningsimpedansen f\u00f6r koppartr\u00e5d.<\/p>\n<p>F\u00f6r st\u00e5ltr\u00e5d var motsvarande f\u00f6rlustmotst\u00e5nd 21 ohm.<\/p>\n<p>&nbsp;<\/p>\n<p>Jag lade d\u00e5 motsvarande f\u00f6rlustmotst\u00e5nd i alla str\u00f6mbukar p\u00e5 l\u00e5ngwiren. Man kan ju se den som 10 seriekopplade halv\u00e5gsdipoler.<\/p>\n<p>&nbsp;<\/p>\n<p>Resultatet blev att en 100 meters longwire p\u00e5 14 MHz har 1,6 dB s\u00e4mre f\u00f6rst\u00e4rkning \u00e4n en LW av FK !,5 och en longwire av st\u00e5ltr\u00e5d har 2,26 dB s\u00e4mre f\u00f6rst\u00e4rkning.<\/p>\n<p>F\u00f6r en halvv\u00e5gsdipol var motsvarande f\u00f6rluster 0,85 respektive 2,3 dB.<\/p>\n<p>Ju l\u00e4ngre antennen \u00e4r desto viktigare med bra material i tr\u00e5den (och givetetvis l\u00e5ga f\u00f6rluster i marken).<\/p>\n<p>&nbsp;<\/p>\n<p>I siffror: Gain Cu = 10,7 dBi, Gain DL1000 = 9,13 dBi och Gain st\u00e5ltr\u00e5d = 8,44 dBi.<\/p>\n<p>&nbsp;<\/p>\n<p>Det senare resultatet \u00f6verensst\u00e4mmer inte med vad man f\u00e5r om man v\u00e4ljer st\u00e5l som material i antenntr\u00e5den i MMANA. D\u00e5 blir Gain = 7,1 dBi dvs 3,63 dB s\u00e4mre \u00e4n med koppar. Samma sak g\u00e4ller f\u00f6r halv\u00e5gsdipoler.<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>2017-12-23 M\u00e4tningar gjordes p\u00e5 en dipol f\u00f6r 20 m. Som referens anv\u00e4ndes FK 1,5. F\u00f6rutom DL 1000 m\u00e4ttes f\u00f6rlusterna p\u00e5 1 mm plastisolerad mjuk st\u00e5ltr\u00e5d. DL 1000 hade 0,85 dB st\u00f6rre f\u00f6rluster \u00e4n FK 1,5 och st\u00e5ltr\u00e5den 2,3 dB st\u00f6rre f\u00f6rluster. Detaljer kan studeras under &#8221;Antenner&#8221;: DL-1000 som antenntr\u00e5d. Hur stora blir f\u00f6rlusterna? &nbsp; Nu [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1130","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/www.sm0brf.se\/index.php?rest_route=\/wp\/v2\/posts\/1130","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\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.sm0brf.se\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1130"}],"version-history":[{"count":6,"href":"https:\/\/www.sm0brf.se\/index.php?rest_route=\/wp\/v2\/posts\/1130\/revisions"}],"predecessor-version":[{"id":1163,"href":"https:\/\/www.sm0brf.se\/index.php?rest_route=\/wp\/v2\/posts\/1130\/revisions\/1163"}],"wp:attachment":[{"href":"https:\/\/www.sm0brf.se\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1130"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.sm0brf.se\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1130"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.sm0brf.se\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1130"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}