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</o:shapelayout></xml><![endif]--></head><body lang=CS link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span lang=EN-CA>DD, opravoval jsem holkam predzesilovac na DVB-T a byla v nem takova nepekna oskliva vec. Nejdriv zakladni info:<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span lang=EN-CA><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-CA>celkem std. zapojeni SE 2x NXP PBR951, prvni s LP kvuli NF, druhy naproudeny, v emitorech odpory 220R, zablokovane keramikou<o:p></o:p></span></p><p class=MsoListParagraph style='text-indent:-18.0pt;mso-list:l0 level1 lfo1'><![if !supportLists]><span lang=EN-CA><span style='mso-list:Ignore'>-<span style='font:7.0pt "Times New Roman"'> </span></span></span><![endif]><span lang=EN-CA>napajeni 12 V<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-CA><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-CA>Omeril jsem pracovni body, OK (oba 6 V +-0.1 V na kolektoru), ale zesik nezesikoval. Nekolikrat jsem to dukladne omeril, ale nic jsem nezjistil. A protoze oprava spechala (holky bez TV jsou pohroma), skocil jsem do GESu a koupil prvni trandak, co meli (BRF93A, to je bezolovo BFR91). Vymenil jsem prvni trandak a ejhle – pracovni bod zustal, ale zesik zesiluje, jak ma. (TJ. druhy stupen je v poradku)<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-CA><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-CA>Takze otazka do plena – mate zkusenost s tim, ze DC je trandak schopny udrzet pracovni bod, ale AC nezesiluje? V tomto pripade mel zesileni cca -20 dB.<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-CA><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-CA>Trandak tu mam v pytliku, takze dalsi mereni jsou mozna ...<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-CA><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-CA>JM<o:p></o:p></span></p><p class=MsoNormal><span lang=EN-CA><o:p> </o:p></span></p><p class=MsoNormal><span lang=EN-CA>P.S. GES me tentokrat potesil cenou ctyri kacky za kus. Vcetne prijemne damske obsluhy palec nahoru.<o:p></o:p></span></p></div></body></html>