Product Description »
1.Summary:
T990S is one high-frequency modulator launched by our company according to constant increase of cable TV programs, Equipped with Philips high performance modulating IC, and combined with CPU control, it adjust video modulation depth, audio-deviation, A/V ratio and RF output frequency in the way of man-machine conversation, it is the first choice equipment for medium sized TV system to increase programs and for emergency standby use.
2.Characteristics:
Double digital PLL, CPU control
Output RF modulating frequency is adjustable in the range of 550-860 MHz
Preset standard channels enable to select any channels at discretion
Audio carrier4.5/5.5/6.0/6.5 MHz is adjustable on panel.
Every channel carrier can be trimmed by 0.25 MHz
Automatic storage memory after power off.
3.Parameters:
Item Unit Parameter
RF Parameter
Output Frequency MHz 45~550
Max Output Level dB¦ÌV 115
RF Output Range dB 13~20
A/V Ratio dB 20
Broadband Noise dB 60
Frequency Stability KHz ±5
Output Impedance Ω 75
Output Return Loss dB 16
Video Mod Depth % 87.5~90
Video Parameter
Input level for 87.5% Vp-p 1
Input Impedance Ω 75
Differential Gain % ¡Ü5
Differential Phase ° ¡Ü5
C/L Delay ns 45
Freq Response dB ±1.0
Video S/N dB 60
Audio Parameter
Input level Vp-p 0.4
Input Impedance Ω 600
Distortion Factor % 0.6
V/A spacing MHz 4.5,5.5,6.0,6.5
Deviation dB ±0.5
Pre-emphasis usec 50
General Performance
Power Supply V/A 180~250
Fuse A -20~0.5
Temperature Range ºC 0~40
