• 회사소개
  • 사업분야
  • 제품소개
  • 연구개발
  • 고객센터
  • 인재채용

Satellite Broadcasting Instruments

  • HOME >
  • Products >
  • Satellite Broadcasting Instruments


Satellite DMB(Digital Multimedia Broadcasting) derives from satellite DAB(Digital Audio Broadcasting), but recent development of digital condensation technology widened the multimedia contents covering audio and simple video clips. Satellite DMB is a service receiving diverse multimedia contents through personal portable terminal or automobile terminal utilizing satellites. Satellite DMB has a unique trait of providing moving service distinguished from existing fixed satellite broadcasts.
For the service in shadow area such as urban areas, basement, and building inside, utilizing satellites for moving service is basis, and ground relay instrument called gap filler should be performed.
Types of gap filler include Frequency Conversion Gap Filler, Direct Amplifying Gap Filler, and Spotlight Gap Filler.
Board performing the main function of gap filler system is TCCU(TDM to CDM Converter Unit).

 
 
 
 


NO Function Specifications Comments
1 RF Input Frequency Range 1,000 MHz ~ 1,500 MHz  
2 Input Range -61dBm ~ -28 dBm  
3 Input Connector Type F - Female  
4 Modulation Type QPSK  
5 Number of Channel 32 Chs. (Pilot 1Ch, including spare 1Ch)  
6 Symbol Rate 18.432 MHz (1/2 Convolutional Encoder)  
7 Error Correction RS (204,188)  
8 Interleaver 12 Cycle Convolution  
9 Error Correction Inside Code Convolutional Encoder 1/2  
10 Roll-OFF Filter Roll-Off Factor 0.35 RRC  
11 BER 210E-4 Max
(After Viterbi-decode Eb/No4.5 dB, 18.432 MHz
 
12 Impedance 75 Ohm(VSWR < 2.5)  
13 LNB Frequency Error Provided by Tuner  
14 Storage Temperature -40 ~ +75  
15 Operation Temperature -30 ~ +70  
16 Operation Humidity 10 % ~ 90 %  

NO Function Specifications Comments
1 Walsh Code CH 32 Chs. (Pilot 1Ch, including spare 1Ch)  
2 Spread Ratio 64  
3 Short Code Walsh  
4 Long Code PN 12, 2048 chip x 2  
5 Frame Length 12.75 ms  
6 Roll-OFF Filter over sampling
᣽0.22 1:4 Interpolation 18.432
 
7 Filter Window Hanning  
8 Modulation Type DS-CDMQPSK  
9 Output Terminal SMA Type Female  
10 Output Impedance 50  
11 Gap Filler ID Message  

NO Function Specifications Comments
1 VFD Display 2x16 Characters  
2 Key Menu Control 5 Keys - Menu, Up, Down, Enter, ESC  
3 Communication Status Display Green/Red LED (TX/RX)  
4 Equipment Status Display 4 Status - Input, Output, LNB DC, PAU  
5 Communication Port D_SUB Connector (9pin, Female)  
6 Temperature Sensor -40 ~ +125  

NO Function Specifications Comments
1 Communication Status Display Green/Red LED (TX/RX)  
2 Equipment Status Display 3 Status - Input, Output, LNB DC  
3 Communication Port D_SUB Connector (9pin, Female)