Feature
Digital display of output channel.
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.
Specifications
Video input amplitude
1Vp-p (whole TV signal , positive)
Video input impedance
75W (lotus flower plug seat)
Audio input amplitude
0.775V
Audio input impedance
10KW (Imbalance lotus flower plug seat)
Degree of video modulation signal
87.5%
Video flatness
?.75dB
Phase of differential coefficient
2?
Gain of differential coefficient
2%
Delay difference of color or light
35ns
Video signal to noise ratio
58dB (unweighted)
64dB (weighted)
Output frequency
45 ～ 860MHz
Frequency accuracy
≤1KHz (VHF)
≤2KHz (UHF)
Total frequency deviation
≤5KHz (VHF)
≤10KHz (UHF)
Output level of video carrier
115dBmV
Adjusting range of output level
0 ～ 15dB
Audio carrier power to video carrier power ratio
?0 ～ ?0dB
Carrier to noise ratio (C/N)
65dB (fc?MHz)
70dB (fc?MHz)
≥ 80dB (fc?6MHz)
RF output impedance
75W
Output suppression
≥ 65dB
Error of video/audio carrier interval
≤?.5KHz
Maximal partial frequency of audio
?0KHz
Pre-emphasis of audio
50ms
Audio flatness (40Hz ～ 15KHz)
≤?.5dB
Distortion degree of audio
≤1%
Audio signal to noise ratio
≥ 60dB
Carrier to inter-modulation ratio
≥ 60dB
Output return loss
≥ 14dB (VHF)
≥ 12dB (UHF)
Power supply
220V AC?0% 50Hz 20VA
Dimension
19?standard structure
Fixing dimension
465?1.8mm
