{"id":1791,"date":"2017-08-16T12:47:02","date_gmt":"2017-08-16T10:47:02","guid":{"rendered":"http:\/\/www.iz2zph.eu\/?p=1791"},"modified":"2017-08-16T14:51:49","modified_gmt":"2017-08-16T12:51:49","slug":"dipolo-incrociato-multibanda","status":"publish","type":"post","link":"https:\/\/www.iz2zph.eu\/?p=1791","title":{"rendered":"dipolo incrociato multibanda"},"content":{"rendered":"<p>*** LAVORI IN CORSO ***<\/p>\n<p>Partendo dall&#8217;idea iniziale di N6VNG che progett\u00f2 una antenna dual band (40 e 20) a v invertito per applicazioni NVIS ho provato a simularne una analoga pi\u00f9 indirizzata verso la normale operativit\u00e0 a medio-lunga distanza<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-1793\" src=\"http:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/teepee.jpg\" alt=\"\" width=\"940\" height=\"691\" srcset=\"https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/teepee.jpg 940w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/teepee-300x221.jpg 300w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/teepee-768x565.jpg 768w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/teepee-100x74.jpg 100w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/teepee-150x110.jpg 150w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/teepee-200x147.jpg 200w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/teepee-450x331.jpg 450w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/teepee-600x441.jpg 600w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/teepee-900x662.jpg 900w\" sizes=\"(max-width: 940px) 100vw, 940px\" \/><\/p>\n<p>Ho cercato come sempre di ottimizzare la portatilit\u00e0 e, scomponendo un dipolo linked a V invertita \u00e8 uscito quanto segue :<\/p>\n<ul>\n<li>espandere il concetto di bibanda mantenendo la struttura meccanica cross<\/li>\n<li>mantenere il cablaggio tra i bracci come nllo schema originale<\/li>\n<li>garantire il sostegno meccanico del palo con i dipoli<\/li>\n<li>nessun accorciamento elettrico dei bracci<\/li>\n<li>partendo dalla soluzione base 40M\/20M \u00e8 possibile tramite link usare anche le bande superiori. E&#8217; \u00a0necessario ripartirle tra i bracci in base alla probabilit\u00e0 di uso (17\/20\/30\/40)<\/li>\n<li>Calcolare per 7 e 9 metri da terra<\/li>\n<\/ul>\n<p>i due lati vengono nominati &#8220;corto&#8221; e &#8220;lungo&#8221; in base alla quantit\u00e0 di rame presente. La lunghezza totale dei due bracci incluse le corde \u00e8 di fatto la stessa (pochi cm di differenza non incidono e possono essere recuperati lavorando sulle corde)<\/p>\n<ul>\n<li>\n<figure id=\"attachment_1795\" aria-describedby=\"caption-attachment-1795\" style=\"width: 741px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1795 size-full\" src=\"http:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/20309.jpg\" alt=\"\" width=\"741\" height=\"470\" srcset=\"https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/20309.jpg 741w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/20309-300x190.jpg 300w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/20309-100x63.jpg 100w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/20309-150x95.jpg 150w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/20309-200x127.jpg 200w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/20309-450x285.jpg 450w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/20309-600x381.jpg 600w\" sizes=\"(max-width: 741px) 100vw, 741px\" \/><figcaption id=\"caption-attachment-1795\" class=\"wp-caption-text\">braccio &#8220;corto&#8221; (20M e 30M ) a 9 metri<\/figcaption><\/figure>\n<figure id=\"attachment_1796\" aria-describedby=\"caption-attachment-1796\" style=\"width: 758px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1796 size-full\" src=\"http:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/20307.jpg\" alt=\"\" width=\"758\" height=\"464\" srcset=\"https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/20307.jpg 758w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/20307-300x184.jpg 300w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/20307-100x61.jpg 100w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/20307-150x92.jpg 150w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/20307-200x122.jpg 200w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/20307-450x275.jpg 450w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/20307-600x367.jpg 600w\" sizes=\"(max-width: 758px) 100vw, 758px\" \/><figcaption id=\"caption-attachment-1796\" class=\"wp-caption-text\">braccio &#8220;corto&#8221; (20M e 30M ) a 7 metri<\/figcaption><\/figure>\n<figure id=\"attachment_1797\" aria-describedby=\"caption-attachment-1797\" style=\"width: 732px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1797 size-full\" src=\"http:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/17409.jpg\" alt=\"\" width=\"732\" height=\"482\" srcset=\"https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/17409.jpg 732w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/17409-300x198.jpg 300w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/17409-100x66.jpg 100w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/17409-150x99.jpg 150w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/17409-200x132.jpg 200w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/17409-450x296.jpg 450w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/17409-600x395.jpg 600w\" sizes=\"(max-width: 732px) 100vw, 732px\" \/><figcaption id=\"caption-attachment-1797\" class=\"wp-caption-text\">braccio &#8220;lungo&#8221; (40M &#8211; 17M) a 9 metri<\/figcaption><\/figure>\n<figure id=\"attachment_1798\" aria-describedby=\"caption-attachment-1798\" style=\"width: 759px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1798 size-full\" src=\"http:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/17407.jpg\" alt=\"\" width=\"759\" height=\"507\" srcset=\"https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/17407.jpg 759w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/17407-300x200.jpg 300w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/17407-100x67.jpg 100w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/17407-150x100.jpg 150w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/17407-200x134.jpg 200w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/17407-450x301.jpg 450w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/17407-600x401.jpg 600w\" sizes=\"(max-width: 759px) 100vw, 759px\" \/><figcaption id=\"caption-attachment-1798\" class=\"wp-caption-text\">braccio &#8220;lungo&#8221; (40M &#8211; 17M) a 7 metri<\/figcaption><\/figure>\n<p>&nbsp;<\/li>\n<li>Un interessante esercizio \u00e8 ipotizzare un uso in 80m. Mi sono limitato al braccio &#8220;lungo&#8221;. Qui l&#8217;altezza minima da terra \u00e8 10 metri e lo spazio occupato \u00e8 di circa 17 metri per ogni lato.<\/li>\n<li>\n<figure id=\"attachment_1813\" aria-describedby=\"caption-attachment-1813\" style=\"width: 656px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1813 \" src=\"http:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/braccio4.jpg\" alt=\"\" width=\"656\" height=\"397\" srcset=\"https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/braccio4.jpg 578w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/braccio4-300x182.jpg 300w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/braccio4-100x61.jpg 100w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/braccio4-150x91.jpg 150w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/braccio4-200x121.jpg 200w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/braccio4-450x272.jpg 450w\" sizes=\"(max-width: 656px) 100vw, 656px\" \/><figcaption id=\"caption-attachment-1813\" class=\"wp-caption-text\">Braccio 40 metri<\/figcaption><\/figure>\n<p><figure id=\"attachment_1814\" aria-describedby=\"caption-attachment-1814\" style=\"width: 656px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" class=\"wp-image-1814 \" src=\"http:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/braccio80.jpg\" alt=\"\" width=\"656\" height=\"422\" srcset=\"https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/braccio80.jpg 595w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/braccio80-300x193.jpg 300w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/braccio80-100x64.jpg 100w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/braccio80-150x97.jpg 150w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/braccio80-200x129.jpg 200w, https:\/\/www.iz2zph.eu\/wp-content\/uploads\/2017\/08\/braccio80-450x290.jpg 450w\" sizes=\"(max-width: 656px) 100vw, 656px\" \/><figcaption id=\"caption-attachment-1814\" class=\"wp-caption-text\">Braccio 80 metri<\/figcaption><\/figure><\/li>\n<\/ul>\n<p>E sempre possibile combinare anche altre misure (80\/30 e 20\/40) \u00a0sfruttando la tecnica dei \u00a0links<\/p>\n<p>Un choke o balun 1:1 \u00e8 sempre raccomandato, in particolare scendendo sotto i 40 metri<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>*** LAVORI IN CORSO *** Partendo dall&#8217;idea iniziale di N6VNG che progett\u00f2 una antenna dual band (40 e 20) a v invertito per applicazioni NVIS ho provato a simularne una analoga pi\u00f9 indirizzata verso la normale operativit\u00e0 a medio-lunga distanza<span class=\"ellipsis\">&hellip;<\/span><\/p>\n<div class=\"read-more\"><a href=\"https:\/\/www.iz2zph.eu\/?p=1791\">Continua a leggere <span class=\"screen-reader-text\">dipolo incrociato multibanda<\/span><span class=\"meta-nav\"> &#8250;<\/span><\/a><\/div>\n<p><!-- end of .read-more --><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[108,1,5,11,92,93],"tags":[],"class_list":["post-1791","post","type-post","status-publish","format-standard","hentry","category-30m","category-altro","category-antenne","category-esperimenti","category-hf","category-portatile"],"_links":{"self":[{"href":"https:\/\/www.iz2zph.eu\/index.php?rest_route=\/wp\/v2\/posts\/1791"}],"collection":[{"href":"https:\/\/www.iz2zph.eu\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.iz2zph.eu\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.iz2zph.eu\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.iz2zph.eu\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1791"}],"version-history":[{"count":10,"href":"https:\/\/www.iz2zph.eu\/index.php?rest_route=\/wp\/v2\/posts\/1791\/revisions"}],"predecessor-version":[{"id":1815,"href":"https:\/\/www.iz2zph.eu\/index.php?rest_route=\/wp\/v2\/posts\/1791\/revisions\/1815"}],"wp:attachment":[{"href":"https:\/\/www.iz2zph.eu\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1791"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.iz2zph.eu\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1791"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.iz2zph.eu\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1791"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}