{"id":221,"date":"2012-05-01T17:01:19","date_gmt":"2012-05-01T15:01:19","guid":{"rendered":"https:\/\/zz-indigo.mavipet.sk\/?p=221"},"modified":"2019-10-29T18:04:59","modified_gmt":"2019-10-29T18:04:59","slug":"dds-oscilatory-zamyslenie","status":"publish","type":"post","link":"https:\/\/zz-indigo.mavipet.sk\/?p=221","title":{"rendered":"DDS oscil\u00e1tory zamyslenie"},"content":{"rendered":"<p>Pozeral som ako niektor\u00fd robia <a title=\"link na wikipediu\" href=\"http:\/\/en.wikipedia.org\/wiki\/Direct_digital_synthesizer\">DDS<\/a> pre sp\u00ednan\u00e9 zmie\u0161ava\u010de. Pou\u017e\u00edvaj\u00fa sa napr\u00edklad pri softwarovo definovan\u00fdch r\u00e1di\u00e1ch <a title=\"link na wikipediu\" href=\"http:\/\/en.wikipedia.org\/wiki\/Software-defined_radio\">SDR<\/a>. Alebo aj pri klasick\u00fdch. V\u00fdhoda t\u00fdchto zmie\u0161ava\u010dov je \u017ee vy\u017eaduj\u00fa oscil\u00e1tor z obd\u013a\u017enikov\u00fdm priebehom. tak\u017ee niesu probl\u00e9my z frekven\u010dnou \u010distotou ako pri s\u00ednusovom, ktor\u00fd vy\u017eaduj\u00fa \u0161tandardn\u00e9 zmie\u0161ava\u010de.<\/p>\n<p><!--more-->\u010co bolo pre m\u0148a ve\u013ek\u00fdm prekvapen\u00edm ako sa k tomu niektor\u00fd technici postavili. Na v\u00fdstup DDS, ktor\u00e9 vedia generova\u0165 po\u017eadovan\u00fd obd\u013a\u017enikov\u00fd sign\u00e1l \u010di u\u017e priamo alebo cez integrovan\u00fd kompar\u00e1tor. Prip\u00e1jaj\u00fa doln\u00e9 priepuste a by v\u00fdsledok pomocou emitorov\u00e9ho sledova\u010da \u010di TTL invertora zmenili na obd\u013a\u017einkov\u00fd. Pri\u010dom bojuj\u00fa z vyv\u00e1\u017een\u00edm pomeru obd\u013a\u017en\u00edkov\u00e9ho sign\u00e1lu 50:50.<\/p>\n<p>P\u00e1r pr\u00edkladou:<\/p>\n<ul>\n<li><a title=\"Str\u00e1nka ka projektu\" href=\"http:\/\/www.mlab.cz\/Server\/GenIndex\/GenIndex.php?path=%2FDesigns%2FHAM+Constructions&amp;lang=en\">HF Tramp<\/a> pri RX ceste, pou\u017eit\u00e9 DDS m\u00e1 nez\u00e1vysl\u00ed v\u00fdstup kde m\u00f4\u017ee generova\u0165 obd\u013a\u017enikov\u00fd prebeh pre RX<\/li>\n<li><a title=\"Strtanky projektou\" href=\"http:\/\/www.nikkemedia.fi\/juma\/\">JUMA RX1, TRX1, TRX2<\/a> V\u0161etky kon\u0161trukcie vyu\u017e\u00edvaj\u00fa sp\u00ednan\u00e9 zmie\u0161ava\u010de.<\/li>\n<\/ul>\n<p>Vie niekto \u010do ich k tomu vedie?<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Pozeral som ako niektor\u00fd robia DDS pre sp\u00ednan\u00e9 zmie\u0161ava\u010de. Pou\u017e\u00edvaj\u00fa sa napr\u00edklad pri softwarovo definovan\u00fdch r\u00e1di\u00e1ch SDR. Alebo aj pri klasick\u00fdch. V\u00fdhoda t\u00fdchto zmie\u0161ava\u010dov je \u017ee vy\u017eaduj\u00fa oscil\u00e1tor z obd\u013a\u017enikov\u00fdm priebehom. tak\u017ee niesu probl\u00e9my z frekven\u010dnou \u010distotou ako pri s\u00ednusovom, &hellip; <a href=\"https:\/\/zz-indigo.mavipet.sk\/?p=221\">Pokra\u010dova\u0165 v \u010d\u00edtan\u00ed <span class=\"meta-nav\">&rarr;<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,5],"tags":[],"class_list":["post-221","post","type-post","status-publish","format-standard","hentry","category-hw-a-sw","category-ostatne"],"_links":{"self":[{"href":"https:\/\/zz-indigo.mavipet.sk\/index.php?rest_route=\/wp\/v2\/posts\/221","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/zz-indigo.mavipet.sk\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/zz-indigo.mavipet.sk\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/zz-indigo.mavipet.sk\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/zz-indigo.mavipet.sk\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=221"}],"version-history":[{"count":1,"href":"https:\/\/zz-indigo.mavipet.sk\/index.php?rest_route=\/wp\/v2\/posts\/221\/revisions"}],"predecessor-version":[{"id":2756,"href":"https:\/\/zz-indigo.mavipet.sk\/index.php?rest_route=\/wp\/v2\/posts\/221\/revisions\/2756"}],"wp:attachment":[{"href":"https:\/\/zz-indigo.mavipet.sk\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=221"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/zz-indigo.mavipet.sk\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=221"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/zz-indigo.mavipet.sk\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=221"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}