射频和VF设计的参考因素BROADCASTING DIVISIONApplication NoteReference factor between RF (referenced to sync top level) and VFProducts:TV Demodulators and Video AnalyzersUAF + EFA 33 VSA + B107BM10_0E Reference factor between RF (referenced to sync top level) and VFLet us analyze a modulated signal:0% 11 % 42 % 73 % 100 %VF100 % whiteside band50 % grey 0 % black - 43 % sync topRF/IFLevel Percentages for RF/IF Signal with Reference to VF SignalNow do the calculation: The sideband amplitude referenced to Upp (USB , LSB) is app (USB , LSB) = 73%-11% = 62% in case of double sideband modulation, as we have in VSB frequency range.73 % Vision Carrierap (USB )=15.5 % ap (LSB)=15.5 %42 % Vision Carrier at VF 50 % greyap (LSB)=15.5 % 11 %ap (USB )=15.5 % a pp (LSB,USB) = 62 % 73 %Vect……
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