{"id":1554,"date":"2018-02-19T16:30:51","date_gmt":"2018-02-19T14:30:51","guid":{"rendered":"http:\/\/racov.ro\/?p=1554"},"modified":"2019-12-22T09:59:02","modified_gmt":"2019-12-22T07:59:02","slug":"interfata-digitala-v2-0","status":"publish","type":"post","link":"https:\/\/racov.ro\/index.php\/2018\/02\/19\/interfata-digitala-v2-0\/","title":{"rendered":"Interfa\u021b\u0103 digital\u0103 v2.0"},"content":{"rendered":"

Dup\u0103 achizi\u021bia unei pl\u0103ci audio externe pe USB<\/a>, am trecut la upgrade-ul interfe\u021bei digitale cu sta\u021bia VHF.
\nInterfa\u021ba pe care o construisem ini\u021bial<\/a>, v1.0, suferea de ni\u0219te dezavantaje care s-au dovedit insuportabile. 1-Mufele audio nu f\u0103ceau bine contact, 2-Transformatoarele de izolare ar\u0103tau groaznic, 3-Cablul spre sta\u021bie era foarte b\u0103\u021bos \u0219i \u021binea cutiu\u021ba \u00een toate direc\u021biile. S\u0103 nu uit\u0103m c\u0103 a fost f\u0103cut\u0103 \u00een decembrie 2015, deci a servit mai mult de 2 ani. E pu\u021bin, v2.0 trebuie s\u0103 \u021bin\u0103 pe via\u021b\u0103 \ud83d\ude00 .<\/p>\n

Am comandat din china ni\u0219te noi transformatoare audio<\/a> 1:1, 600\u03a9. Am dat 1,27 euro<\/strong> pe 5 buc\u0103\u021bi<\/strong>!
\nDesigur, dup\u0103 ce le-am m\u0103surat cu aten\u021bie a reie\u0219it:<\/p>\n\n\n<\/colgroup>\n\n\n\n\n\n\n\n\n
Trafo<\/td>\nPrimar<\/td>\nSecundar<\/td>\n<\/tr>\n
R (\u2126)<\/td>\nL (mH)<\/td>\nR (\u2126)<\/td>\nL (mH)<\/td>\n<\/tr>\n
1<\/td>\n133,2<\/td>\n754,1<\/td>\n136<\/td>\n758,7<\/td>\n<\/tr>\n
2<\/td>\n138,2<\/td>\n732,6<\/td>\n135,4<\/td>\n739,4<\/td>\n<\/tr>\n
3<\/td>\n137,4<\/td>\n774,9<\/td>\n131,2<\/td>\n777,5<\/td>\n<\/tr>\n
4<\/td>\n138,5<\/td>\n736,7<\/td>\n132,7<\/td>\n734,6<\/td>\n<\/tr>\n
5<\/td>\n131,8<\/td>\n719<\/td>\n132,6<\/td>\n718,4<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

Dispersia valorilor este considerabil\u0103, peste 20%. De asemenea observ c\u0103 130\u03a9 chineze\u0219ti sunt echivalen\u021bi cu 600\u03a9 europeni.<\/p>\n

La noua versiune am mers pe un design minimalist \u0219i am ales o carcas\u0103 de mouse, c\u0103 are deja butoane frumoase din construc\u021bie, e mic\u0103, elegant\u0103 dar totu\u0219i \u00eenc\u0103p\u0103toare \u0219i am destui mau\u0219i pe stoc.
\nDe asemenea, am renun\u021bat la multe accesorii din vechea interfa\u021b\u0103, pe care nu le-am folosit niciodat\u0103, cum ar fi butoanele pentru canale, adaptorul pentru c\u0103\u0219ti de calculator \u0219i gr\u0103mada de mufe audio.<\/p>\n

Cum era v1.0<\/strong> pe din\u0103untru \u0219i pe dinafar\u0103:
\n
\n<\/p>\n

Carcase…
\n
\nAm folosit pentru PTT ap\u0103satul pe roti\u021b\u0103.
\n\u0218i noua mea micro-scul\u0103 multifunc\u021bional\u0103 de m\u00e2n\u0103 Parkside de la Lidl…
\n
\n<\/p>\n

Mai departe merge cam a\u0219a…
\n
\n
\n
\n
\nAm lipit piuli\u021ba aia mare ca interfa\u021ba s\u0103 capete pu\u021bin\u0103 greutate \u0219i stabilitate pe mas\u0103.<\/p>\n

Design minimalist, cu buton de selectare PTT \/ VOX pus sus pe carcas\u0103, a\u0219a cum a sugerat my pretious<\/em>, ca s\u0103 fie vizibil \u0219i accesibil.<\/p>\n

Func\u021bioneaz\u0103 impecabil.
\n<\/p>\n

Iar la final, c\u00e2teva analize comparative…<\/strong><\/span>
\nC\u00e2nd interfa\u021ba veche s-a destr\u0103mat, nu mai puteam emite \u00een digital pe VHF. Puteam doar s\u0103 recep\u021bionez, cupl\u00e2nd ie\u0219irea de casc\u0103 din sta\u021bie, la LINE IN<\/em>. Problema e c\u0103 a\u0219a, pe direct, apar ni\u0219te interferen\u021be care dau un u\u0219or \u021biuit \u00een lini\u0219te. Am \u00eencercat s\u0103 le atenuez pun\u00e2nd ferite pe cablul audio.
\n
\n\u00cembun\u0103t\u0103\u021bire neglijabil\u0103 spre inexistent\u0103.
\nCu transformatoarele mele de izolare galvanic\u0103, lini\u0219tea e des\u0103v\u00e2r\u0219it\u0103\u00a0\ud83d\ude09 .<\/p>\n

Iat\u0103 ni\u0219te grafice comparative de zgomot \u00een gol:
\n1. Cablu chior
\n
\n2. Cablu cu ferite la capete
\n
\n3. Cu transformatoare de izolare galvanic\u0103
\n\"
\nZgomotul care se vede pe bar-graph<\/em> e proprietate placa de sunet. Ce s\u0103 a\u0219tep\u021bi de la o ieftin\u0103tur\u0103?! Pentru mine, ca interfa\u021b\u0103 cu sta\u021biile radio, e suficient.<\/p>\n

Transformatoarele vechi \u0219i cele noi…
\n<\/p>\n

Despre montajul de VOX… c\u0103 sta\u021bia mea nu are built-in<\/em>\u00a0\ud83d\ude10 .
\n\"\"<\/a>
\nDac\u0103 ar fi s\u0103 mai \u00eembun\u0103t\u0103\u021besc ceva, \u00een afar\u0103 de ceea ce e deja modificat cu pixul, a\u0219 m\u0103ri doar C12<\/strong><\/em>\u00a0la peste 100\u03bcF, s\u0103 \u021bin\u0103 mai mult emisia cuplat\u0103, fiindc\u0103 uneori am impresia c\u0103 decupleaz\u0103 prea repede. C9<\/strong><\/em> ar putea fi cu un ordin de m\u0103rime (10x) mai mare, iar C11<\/strong><\/em>, evident, nu mai exist\u0103, c\u0103 e \u00een paralel cu C12<\/strong><\/em>.
\n
\n<\/p>\n

<\/p>\n

La finalul lucr\u0103rii, mi-au mai r\u0103mas piese din marfa veche. \u00centotdeauna dup\u0103 o repara\u021bie, c\u00e2nd \u00ee\u021bi mai r\u0103m\u00e2n piese, \u00eenseamn\u0103 c\u0103 l-ai f\u0103cut mai bun \ud83d\ude0e
\n<\/p>\n

\u0218i pe c\u00e2nd f\u0103ceam probe, am constat c\u0103 laptopul nu era pus la mas\u0103\u00a0 (ground<\/em>) calumea. Poate c\u0103 p\u00e2n\u0103 la urm\u0103 primea mas\u0103 pe undeva , indirect, dar nu e corect, a\u0219a c\u0103 am luat m\u0103suri. Nu am sesizat nicio diferen\u021b\u0103, dar sigur semnalele se simt mai protejate, mai \u00een siguran\u021b\u0103.
\nIar eu m\u0103 simt bine c\u00e2nd semnalele se simt bine.
\n
\n<\/p>\n","protected":false},"excerpt":{"rendered":"

Dup\u0103 achizi\u021bia unei pl\u0103ci audio externe pe USB, am trecut la upgrade-ul interfe\u021bei digitale cu sta\u021bia VHF. Interfa\u021ba pe care<\/p>\n","protected":false},"author":1,"featured_media":1555,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_feature_clip_id":0,"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":false,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2},"jetpack_post_was_ever_published":false},"categories":[2,7],"tags":[],"class_list":["post-1554","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-2","category-7"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/i0.wp.com\/racov.ro\/wp-content\/uploads\/2018\/02\/RME-fireface_ufx.jpg?fit=700%2C350&ssl=1","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p75FkB-p4","jetpack_likes_enabled":true,"_links":{"self":[{"href":"https:\/\/racov.ro\/index.php\/wp-json\/wp\/v2\/posts\/1554","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/racov.ro\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/racov.ro\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/racov.ro\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/racov.ro\/index.php\/wp-json\/wp\/v2\/comments?post=1554"}],"version-history":[{"count":13,"href":"https:\/\/racov.ro\/index.php\/wp-json\/wp\/v2\/posts\/1554\/revisions"}],"predecessor-version":[{"id":2223,"href":"https:\/\/racov.ro\/index.php\/wp-json\/wp\/v2\/posts\/1554\/revisions\/2223"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/racov.ro\/index.php\/wp-json\/wp\/v2\/media\/1555"}],"wp:attachment":[{"href":"https:\/\/racov.ro\/index.php\/wp-json\/wp\/v2\/media?parent=1554"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/racov.ro\/index.php\/wp-json\/wp\/v2\/categories?post=1554"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/racov.ro\/index.php\/wp-json\/wp\/v2\/tags?post=1554"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}