Adjacent Channel Modulator CATV Headend

Adjacent Channel Modulator CATV HeadendFeatures : Human-oriented design such as LCD display of RF, Video/Audio intermediate frequency, Video modulation rate, Audio partial frequency and RF output voltage; optional function of reducing noise. Designed by adjacent channel transmission standard, no interference between adjacent channels; Input and output of Video/Audio intermediate frequency signal used for scrambling subscription CATV system. .... Oscillator using unique phase-lock (PLL) circuit makes phase noise extremely low, makes video clear and stable, creates auto amplitude-fixed RF circuit and causes head-end system stable and reliable. Using dual-balancing diode modulation with fine linearity and low noise, fine indexes including signal to noise ratio (S/N), carrier noise rate (C/N), differential gain (DG) and differential phase (DP) as good as those of import slap-up modulators. .. 19-inch standard structure, independent power supply, flexible fit out, elegant appearance, firm structure, nice electromagnetism shield and convenient operation and maintenance. SpecificationsVideo input amplitude 1Vp-p (whole TV signal, positive)Video input impedance 75W (lotus flower plug seat)Audio input amplitude 0.775VAudio input impedance 10KW(Imbalance lotus flower plug seat)Degree of video modulation signal &le 87.5%Video flatness &le75dBPhase of differential coefficient &le2Gain of differential coefficient &le2%Delay difference of color or light &le30ns Video signal to noise ratio &le 58dB(unweighted)&ge64dB (weighted)Output frequency 45&sim870MHzFrequency accuracy &le1KHzTotal Frequency deviation &le5KHzOutput level of video carrier &ge120dBmVAdjusting range of output level 0&sim15dBAudio carrier power to video carrier power ratio Negative 10&simnegative20dBCarrier to noise ratio (C/N) &ge65dB (fc MHz)&ge70dB (fc MHz)&ge80dB(fc 6MHz)RF output impedance 75WOutput suppression &ge65dBError of video/audio carrier interval &le5KHzMaximum partial frequency of audio 0KHzPre-emphasis of audio 50msAudio flatness(40Hz 15KHz) &le5dBDistortion degree of audio &le1% Audio signal to noise ratio &ge60dBCarrier to inter-modulation ratio &ge 60dBOutput Return loss &ge 15dB (VHF)&ge12dB (UHF)Power supply 220V AC10% 50Hz 20VADimension 19" Standard structureFixing dimension 465 1.8mmCATV headend, digital headend, dtv headend