Specifications

It can receive MPTS/SPTS from encoders, multiplexer, scrambler, etc, to process modulating and channel error-correction encoding

Description

QAM Modulator

 

Brief introduction

JD-QAM-1100 Modulator is self-designed QAM digital modulator with high performance. It can receive MPTS and SPTS from encoders, multiplexer, DVB gateway, scrambler, video server, etc, to process modulating and channel error-correction encoding. It can supply with variable frequency to digital TV channel or supply with RF (fixed or frequency agility) output.

It is with the characteristics of flexible configuration, high-performance indications and stability, and can be applied to the front end system for large and medium size cable digital TV; it is also high cost performance product, which can increase the contents of digital TV channels on the basis of current analogue/digital cable TV front end system (e.g. medium, small size cable station, enterprises and public istitutions station, hotel, community, etc.)

 

Features

 

• In accordance with DVB-C standard channel encoding
• Support whole range of variable signal rate and QAM star level
• Support PID filtering/re-mapping
• Support PSI/SI information simultaneously update
• Support NIT table editing
• Automatic code stream filling and intelligent empty pack deleting
• With the function of PCR high-precision correction
• Code rate input form including ASI/DS3 (optional) format and so on
• RF are fixable or frequency agility output
• Supply with RF output monitoring port (-30dB)
• Supply with DVB ASI/SPI input interface and ASI looping out interface
• Front panel LCD shows key control parameters and controls operation, with Chinese and English menu selection
• LED status display and warning indicator
• Support 10M/100M Ethernet control interface, and can upgrade on line through network
• Local/long-distance control and central management are available through network management system
• 19” 1 U standard rack structure

 

Technical parameters

 

QAM modulation	16/32/64/128/256 (optional)
Symbol rate	1~7 Mbaud/s
Input data speed	1.5~51Mbps
Channel data speed	20~56Mbps
Output bandwidth	8MHz
Output Impedance	75Ω
Output reflection loss	less than14dB
RF output frequency	48~860MHz  fixed/frequency agility
Output frequency stepping	0.1MHz
Output frequency error	less than 15KHz
RF output level	equals or more than 108dBμV
RF output monitor	-30 dBμV
RF output level adjustment	0~16dB(0.5dB stepping)
Medium-frequency output frequency	35.25/36.15/36.65/44/70MHz (optional)
Medium-frequency output level	equals or more than 80 dBμV
Modulating BER	more than 35dB(RF output testing)
SNR	more than 48dB
PCR jittering	less than 100ns
Parasitism output rejection	equals or more than 55dB
Phase noise	less than -65dB@1KHz less than -85dB@1KHz less than -105dB@1KHz
Power supply parameter	AC 220V. 50Hz. 30W