{"id":355,"date":"2015-03-10T21:44:48","date_gmt":"2015-03-10T21:44:48","guid":{"rendered":"http:\/\/localhost\/SM0BRF\/wordpress-3.9.1-sv_SE\/wordpress\/?p=355"},"modified":"2016-02-19T19:29:00","modified_gmt":"2016-02-19T19:29:00","slug":"the-gain-of-the-fb-53-tribander-and-influence-from-the-3040-meter-dipole","status":"publish","type":"post","link":"https:\/\/www.sm0brf.se\/?p=355","title":{"rendered":"The gain of the FB-53 tribander and influence from the 30\/40-meter dipole"},"content":{"rendered":"<p><span id=\"result_box\" lang=\"en\"><span title=\"F\u00f6r att utr\u00f6na i vilken m\u00e5n dipolen f\u00f6r 30\/40-metersdipolen p\u00e5verkade FB-53an utf\u00f6rdes ett antal m\u00e4tningar.\">In order to ascertain the extent to which the dipole for 30\/40-meter affected tribander I\u00a0 performed a number of measurements. <\/span><span title=\"Dessa utf\u00f6rdes under oktober 2014 och begr\u00e4nsades i huvudsak till 20-metersbandet.\">These were conducted during October 2014, and were limited mainly to the 20-meter band. <\/span><span title=\"Resultatet kan sammanfattas enligt nedan:&lt;\/p&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;\n&lt;p&gt;\">The results can be summarized as follows:<\/span><\/span><\/p>\n<p><span title=\"Med dipolen l\u00e4ngs med Radiator och dipolens koax kortsluten i neder\u00e4nden&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;\n\">1. With the dipole along the radiator and the dipole coax shorted in the lower end<br \/>\n<\/span>* -3 dB relative to a reference station.<br \/>\n<span title=\"1. -3 dB i f\u00f6rh\u00e5llande till referensstation.&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;\n\">* <\/span><span title=\"2. -2 dB i f\u00f6rh\u00e5llande till referensdipol.&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;\n\">-2 dB relative to a reference dipole.<\/span><\/p>\n<p><span title=\"Med dipolen l\u00e4ngs med radiatorn och koaxen till dipolen avslutad med kondensator f\u00f6r SWR=1 p\u00e5 FB-53.&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;\n\">2. With the dipole along the radiator and the feeder terminated with a capacitor for SWR = 1 on the tribander.<br \/>\n<\/span><span title=\"Med dipolen l\u00e4ngs med radiatorn och koaxen till dipolen avslutad med kondensator f\u00f6r SWR=1 p\u00e5 FB-53.&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;\n\">* <\/span><span title=\"1. -3 dB j\u00e4mf\u00f6rt med referensdipol (kompenserat).\">The -3 dB compared with reference dipole. <\/span><span title=\"(1 dB s\u00e4mre \u00e4n kortsluten koax).&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;\n\">(1 dB worse than with shorted coax).<br \/>\n<\/span><span title=\"(1 dB s\u00e4mre \u00e4n kortsluten koax).&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;\n\">* <\/span><span title=\"2. Vid direkt j\u00e4mf\u00f6relse med kortsluten koax \u00e4r signalen 3 dB svagare med vridkondensator.\">In direct comparison with shorted coax the signal is 3 dB less with variable capacitor. <\/span><span title=\"(St\u00e4mmer inte med m\u00e4tningen mot referensdipol).&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;\n\">(Does not agree with the measurement to reference dipole).<\/span><\/p>\n<p><span title=\"3. Det gick att \u00e4ndra F\/B-f\u00f6rh\u00e5llande genom att skifta mellan kondensator och kortslutning.&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;\n\">3. Failed to change the F \/ B ratio by shifting between the capacitor and short circuiting.<\/span><\/p>\n<p><span title=\"Med dipolen l\u00e4ngs med radiatorn och dipolkoaxen avslutad med konstlast p\u00e5 50 ohm och 13% dumpad effekt (av det som matas till FB-53an).&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;\n\">4. With the dipole along with the radiator and dipolkoaxen closed with dummy load of 50 ohms and 13% dumped effect (of what is fed to the FB 53an).<br \/>\n* <\/span><span title=\"1. Skillnad = 0 dB j\u00e4mf\u00f6rt med referensdipol (kompenserat).&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;\n\">Difference = 0 dB compared to referensdipol (compensated).<\/span><\/p>\n<p><span title=\"Med dipolen l\u00e4ngs med bommen.&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;\n\">5. With the dipole along the boom.<br \/>\n<\/span><span title=\"Med dipolen l\u00e4ngs med bommen.&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;\n\"> * <\/span><span title=\"1. +2 dB j\u00e4mf\u00f6rt med referensstation&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;\n\">+2 dB relative to the reference station<br \/>\n<\/span><span title=\"1. +2 dB j\u00e4mf\u00f6rt med referensstation&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;\n\"> * <\/span><span title=\"2. +3 dB j\u00e4mf\u00f6rt med referensdipol med h\u00e4nsyn tagen till kabelf\u00f6rluster och viss h\u00f6jdskillnad (kompenserat).&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;&lt;br \/&gt;\n\">+3 dB relative to the reference dipole<\/span><span title=\"Dvs 3 dBd f\u00f6rst\u00e4rkning.\">.<\/span><\/p>\n<p><strong>That is: The Gain of the tribander is measured to 3 dBd.<\/strong><\/p>\n","protected":false},"excerpt":{"rendered":"<p>In order to ascertain the extent to which the dipole for 30\/40-meter affected tribander I\u00a0 performed a number of measurements. These were conducted during October 2014, and were limited mainly to the 20-meter band. The results can be summarized as follows: 1. With the dipole along the radiator and the dipole coax shorted in the [&hellip;]<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[9],"tags":[],"class_list":["post-355","post","type-post","status-publish","format-standard","hentry","category-my-antennas"],"_links":{"self":[{"href":"https:\/\/www.sm0brf.se\/index.php?rest_route=\/wp\/v2\/posts\/355","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=355"}],"version-history":[{"count":1,"href":"https:\/\/www.sm0brf.se\/index.php?rest_route=\/wp\/v2\/posts\/355\/revisions"}],"predecessor-version":[{"id":478,"href":"https:\/\/www.sm0brf.se\/index.php?rest_route=\/wp\/v2\/posts\/355\/revisions\/478"}],"wp:attachment":[{"href":"https:\/\/www.sm0brf.se\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=355"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.sm0brf.se\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=355"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.sm0brf.se\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=355"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}