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ÌÍÎÃÎÄÈÀÏÀÇÎÍÍÛÅ ÓÑÈËÈÒÅËÈ ÄËß ÀÍÒÅÍÍÛÕ ÑÈÑÒÅÌ ÎÁÙÅÃÎ ÏÎËÜÇÎÂÀÍÈß
ØÈÐÎÊÎÏÎËÎÑÍÛÅ ÌÍÎÃÎÄÈÀÏÀÇÎÍÍÛÅ ÓÑÈËÈÒÅËÈ ÄËß ÀÍÒÅÍÍÛÕ ÑÈÑÒÅÌ ÎÁÙÅÃÎ ÏÎËÜÇÎÂÀÍÈß
Ïðèìåíÿþò ïîäîáíûå óñèëèòåëè êàê ïîäúåçäíûå èëè äîìîâûå â íåáîëüøèõ ñèñòåìàõ êîëëåêòèâíîãî òåëåâèçèîííîãî ïðèåìà (ÑÊÒÏ). Ïàðàìåòðû àíòåííîãî óñèëèòåëÿ UYDU Êîýôôèöèåíò óñèëåíèÿ ïî âõîäó VHF 1 (2-4ê,5-10ê),äÁ, íå ìåíåå .................. 30 ïî âõîäó VHF 2 (5-12ê),äÁ, íå ìåíåå .................................................................. 30 ïî âõîäó UHF 3 (21-áÎê), äÁ, íå ìåíåå ................................................................ 35 ïî âõîäó UÍF4(21-60ê),äÁ, íå ìåíåå ................................................................ 35 Êîýôôèöèåíò øóìà, äÁ, íå áîëåå ........................................................................ 8 Ãëóáèíà ðåãóëèðîâêè ñèãíàëà ïî âõîäàì VHF 1, VHF 2, äÁ ...............................-14 Ãëóáèíà ðåãóëèðîâêè ñèãíàëà ïî âõîäó UHF 3, äÁ .............................................. -23 Ìàêñèìàëüíûé âûõîäíîé óðîâåíü ñèãíàëà, äÁ/ìêÂ, íå ìåíåå .......................... 125 Âõîäíîå è âûõîäíîå âîëíîâîå ñîïðîòèâëåíèå, Îì............................................. 75 Ïèòàíèå îò ñåòè ïåðåìåííîãî òîêà ........................................................................ 220Â/50Ãö Óñèëèòåëü äëÿ êîëëåêòèâíîãî ïðèåìà "UYDU", èçãîòîâëåííûé â Òóðöèè (ðèñ. 5.15), ïðåäíàçíà÷åí äëÿ ïîâûøåíèÿ óðîâíÿ ñèãíàëà â VHF-UHF òåëåâèçèîííûõ äèàïàçîíàõ. Âîçìîæíî îäíîâðåìåííîå ïîäêëþ÷åíèå äî ÷åòûðåõ íåçàâèñèìûõ àíòåíí ñ ðàçëè÷íîé ïîëÿðèçàöèåé ñèãíàëà. Óñèëèòåëü èìååò äâà ðàçäåëüíûõ êàíàëà óñèëåíèÿ - VHF è UHF (ðèñ. 5.16). Ïåðâûé êàíàë èìååò äâà âõîäà - VHF 1 (2 - 4 ê), VHF 2 (5 -12 ê). Óñèëåíèå â ýòîì äèàïàçîíå îáåñïå÷èâàþò òðàíçèñòîðû VT1, VT2. Ðåçèñòîðîì R5 îñóùåñòâëÿåòñÿ óñòàíîâêà íåîáõîäèìîãî óðîâíÿ ñèãíàëà íà âûõîäå óñèëèòåëÿ. Êàíàë UHF èìååò òðè êàñêàäà óñèëåíèÿ (VT3...VT5) ñ ðåãóëèðîâêîé óðîâíÿ ñèãíàëà ïî âõîäó UHF 3. Èìååòñÿ âîçìîæíîñòü çàïèòûâàòü îò îáùåãî ñòàáèëèçàòîðà DA1 äîïîëíèòåëüíûé ïðåäóñèëèòåëü, óñòàíàâëèâàåìûé íà àíòåííå. Äëÿ ýòîãî íåîáõîäèìî çàìêíóòü òåõíîëîãè÷åñêèå êëåììû À è Â. ÂÍÈÌÀÍÈÅ! Íåèñïîëüçóåìûå âõîäû óñèëèòåëÿ íåîáõîäèìî çàøóíòèðîâàòü (ñîåäèíèòü ñ êîðïóñîì ÷åðåç ñîïðîòèâëåíèå 75 Îì
Ðèñ. 5.16. Ïðèíöèïèàëüíàÿ ñõåìà àíòåííîãî óñèëèòåëÿ UYDU |
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