{"id":2446,"date":"2018-02-04T23:04:21","date_gmt":"2018-02-04T23:04:21","guid":{"rendered":"http:\/\/radioamadorismo.x10host.com\/?p=2446"},"modified":"2018-02-04T23:04:21","modified_gmt":"2018-02-04T23:04:21","slug":"mmdvm_hs-v1-4-com-duas-antenas","status":"publish","type":"post","link":"https:\/\/ct1jqj.eu\/?p=2446","title":{"rendered":"MMDVM_HS (v1.4) com duas antenas"},"content":{"rendered":"<div class=\"pld-like-dislike-wrap pld-template-4\">\r\n    <div class=\"pld-like-wrap  pld-common-wrap\">\r\n    <a href=\"javascript:void(0)\" class=\"pld-like-trigger pld-like-dislike-trigger  \" title=\"\" data-post-id=\"2446\" data-trigger-type=\"like\" data-restriction=\"cookie\" data-already-liked=\"0\">\r\n                        <i class=\"far fa-smile\"><\/i>\r\n                    <\/a>\r\n    <span class=\"pld-like-count-wrap pld-count-wrap\">    <\/span>\r\n<\/div><div class=\"pld-dislike-wrap  pld-common-wrap\">\r\n    <a href=\"javascript:void(0)\" class=\"pld-dislike-trigger pld-like-dislike-trigger  \" title=\"\" data-post-id=\"2446\" data-trigger-type=\"dislike\" data-restriction=\"cookie\" data-already-liked=\"0\">\r\n                        <i class=\"far fa-frown\"><\/i>\r\n                    <\/a>\r\n    <span class=\"pld-dislike-count-wrap pld-count-wrap\"><\/span>\r\n<\/div><\/div><p style=\"text-align: justify;\">No sentido de tornar este hotspot mais compacto e port\u00e1til sem a necessidade de antena externa na ficha SMA, foi feito um upgrade com antenas cer\u00e2micas pelo\u00a0colega Freitas, CT1FZC (A quem agrade\u00e7o pela ideia que teve e que permitiu escrever este artigo), ao hotspot MMDVM_HS, vers\u00e3o 1.4 (Para outras vers\u00f5es \u00a0aconselha-se que se veja o esquema, pois h\u00e1 pequenas diferen\u00e7as entre eles). Como referido, neste caso substituiu-se a ficha SMA por duas antenas. Sim, por duas! Com este upgrade, consegue-se ter uma melhor sensibilidade na recep\u00e7\u00e3o do ADF, do que a que ter\u00edamos se us\u00e1ssemos apenas uma antena interna para o TX\/RX. Analisando o esquema, reparamos que as linhas de TX e RX est\u00e3o ambas ligadas atrav\u00e9s de dois condensadores \u00e0 sa\u00edda, o que se fez neste caso foi separar a liga\u00e7\u00e3o deles de modo a isolar a linha de RX da linha de TX e com isso conseguir a separa\u00e7\u00e3o das linhas.<\/p>\n\n\t\t<style>\n\t\t\t#gallery-1 {\n\t\t\t\tmargin: auto;\n\t\t\t}\n\t\t\t#gallery-1 .gallery-item {\n\t\t\t\tfloat: left;\n\t\t\t\tmargin-top: 10px;\n\t\t\t\ttext-align: center;\n\t\t\t\twidth: 33%;\n\t\t\t}\n\t\t\t#gallery-1 img {\n\t\t\t\tborder: 2px solid #cfcfcf;\n\t\t\t}\n\t\t\t#gallery-1 .gallery-caption {\n\t\t\t\tmargin-left: 0;\n\t\t\t}\n\t\t\t\/* see gallery_shortcode() in wp-includes\/media.php *\/\n\t\t<\/style>\n\t\t<div id='gallery-1' class='gallery galleryid-2446 gallery-columns-3 gallery-size-thumbnail'><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/ct1jqj.eu\/?attachment_id=3966'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/ct1jqj.eu\/wp-content\/uploads\/2018\/02\/mmdvm14-1-150x150.png\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/dt><\/dl>\n\t\t\t<br style='clear: both' \/>\n\t\t<\/div>\n\n<p>Fotografias do resultado final:<\/p>\n\n\t\t<style>\n\t\t\t#gallery-2 {\n\t\t\t\tmargin: auto;\n\t\t\t}\n\t\t\t#gallery-2 .gallery-item {\n\t\t\t\tfloat: left;\n\t\t\t\tmargin-top: 10px;\n\t\t\t\ttext-align: center;\n\t\t\t\twidth: 33%;\n\t\t\t}\n\t\t\t#gallery-2 img {\n\t\t\t\tborder: 2px solid #cfcfcf;\n\t\t\t}\n\t\t\t#gallery-2 .gallery-caption {\n\t\t\t\tmargin-left: 0;\n\t\t\t}\n\t\t\t\/* see gallery_shortcode() in wp-includes\/media.php *\/\n\t\t<\/style>\n\t\t<div id='gallery-2' class='gallery galleryid-2446 gallery-columns-3 gallery-size-thumbnail'><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/ct1jqj.eu\/?attachment_id=3967'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/ct1jqj.eu\/wp-content\/uploads\/2018\/02\/pichivatio1-1-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/dt><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/ct1jqj.eu\/?attachment_id=3968'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/ct1jqj.eu\/wp-content\/uploads\/2018\/02\/pichivatio2-1-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/dt><\/dl><dl class='gallery-item'>\n\t\t\t<dt class='gallery-icon landscape'>\n\t\t\t\t<a href='https:\/\/ct1jqj.eu\/?attachment_id=3969'><img loading=\"lazy\" decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/ct1jqj.eu\/wp-content\/uploads\/2018\/02\/pichivatio3-1-150x150.jpg\" class=\"attachment-thumbnail size-thumbnail\" alt=\"\" \/><\/a>\n\t\t\t<\/dt><\/dl><br style=\"clear: both\" \/>\n\t\t<\/div>\n\n<p style=\"text-align: justify;\">Note-se que para que a antena de RX trabalhar como deve ser, \u00e9 necess\u00e1rio que esteja ligeiramente elevada, \u00b1 2 a 3mm em rela\u00e7\u00e3o \u00e0 placa.<\/p>\n<p style=\"text-align: justify;\">NOTA: Quem quiser fazer esta modifica\u00e7\u00e3o, tenha em conta que o ADF7021 \u00e9 extremamente sens\u00edvel \u00e0 electricidade est\u00e1tica, fa\u00e7am por vossa conta e risco, se correr mal n\u00e3o nos responsabilizamos, este artigo est\u00e1 aqui a t\u00edtulo meramente informativo.<\/p>\n<p>Link para aquisi\u00e7\u00e3o das antenas, caso haja interesse:\u00a0<a href=\"https:\/\/pt.aliexpress.com\/item\/O-envio-gratuito-de-Cer-mica-antena-RAINSUN-AN1603-433M-AN1603-433MHZ-433-M-868-916\/32831357808.html?spm=a2g0s.9042311.0.0.bc5tf0\" target=\"_blank\" rel=\"noopener noreferrer\">AliExpress<\/a><\/p>\n<p style=\"text-align: justify;\">73&#8217;s<\/p>\n","protected":false},"excerpt":{"rendered":"<p>No sentido de tornar este hotspot mais compacto e port\u00e1til sem a necessidade de antena externa na ficha SMA, foi feito um upgrade com antenas cer\u00e2micas pelo\u00a0colega Freitas, CT1FZC (A quem agrade\u00e7o pela ideia que teve e que permitiu escrever este artigo), ao hotspot MMDVM_HS, vers\u00e3o 1.4 (Para outras vers\u00f5es \u00a0aconselha-se que se veja o [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":4346,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,6,10],"tags":[140,177,181,235],"class_list":["post-2446","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-electronica","category-equipamento","category-informacao","tag-dmr","tag-hamradio","tag-hotspot","tag-mmdvm_hs"],"_links":{"self":[{"href":"https:\/\/ct1jqj.eu\/index.php?rest_route=\/wp\/v2\/posts\/2446","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/ct1jqj.eu\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/ct1jqj.eu\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/ct1jqj.eu\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/ct1jqj.eu\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2446"}],"version-history":[{"count":0,"href":"https:\/\/ct1jqj.eu\/index.php?rest_route=\/wp\/v2\/posts\/2446\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/ct1jqj.eu\/index.php?rest_route=\/wp\/v2\/media\/4346"}],"wp:attachment":[{"href":"https:\/\/ct1jqj.eu\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2446"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/ct1jqj.eu\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=2446"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/ct1jqj.eu\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=2446"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}