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digital tv Front-end luch method Debugging

Nov 25, 2014

qaStaHvIS digital HaSta jIH nach megh'an luch, rewbe'mey'e', petaQ output patlh modulator modulator Se' lIS 'ej HIjmeH debugging.


(1) outputs DuD analog 'ej digital signals signal patlh adjustment neH tlhop megh'an 'ay' pat cable HaSta jIH, output modulator output. muHIvtaHbogh pIm modulation scheme 'ej vaj, output patlh je pIm. carrier modulated analog HaSta jIH vsb; i.e., residual sideband amplitude modulation pat; 'ej 64 qamm modulated, chonaDmo', cha'logh vaj sideband, nagh characteristics chaq cable digital, peak HoS je motlhbogh HoS pIm, waw' calculations practical SIQpu'bogh, 'ej patlh ghuS law' analog modulator output patlh 10db output motlh digital modulator. loQ addition pat metrics network Hoch wo' Sov wIHutlh DuqIppu'chugh analog 'ej analog channels, digital channels digital patlh size flatness 'ej output. tlhop, chut lulajpu'bogh, jenwI' circuit 'op 'eS QaQ SeH size difference smaller channels, pat flatness patlh difference 'uybogh pegh Dunmo' SabtaHbogh output patlh SeH addition. ± 0.5dbμv vaj wej exceed Sa' front-end analog 'ej analog adjacent channel patlh difference SabtaHbogh digital 'ej digital adjacent channel.


(2) modulator settings mentioned wovbe' muHIvtaHbogh pIm modulation analog channels digital channels je, 'ej vaj output Se' settings Se' pIm. HIjmeH analog tv modulator Se' pong vision carrier Se', 'ej tv modulator digital according to botlh Se' channel HIjmeH Se' 'oH potlh.