DVB-T Modulator

DVB-T Modulator 1.1 Outline DVB-T fm modulator supports all DVB-T standard channel coding and modulation parameters, and supports for MFN. This system meets DVB-T and EN50083 standards. Since it supports FEC and RS correction and encoding, it is convenient to communicate with other analogue and digital signals, such as video conference, internet, and IP phone. In addition, this modulator supports HFC, MMDS and 8GHz broadband digital systems and it brings modern digital services to customers in large area. 1.2 Features l Complying DVB-T, ETSI/ EN50083 l Support OFDM with: 2K, 4K, 8K l Support modulation with: QPSK, 16QAM, 64QAM l FEC:1/2, 2/3, 3/4, 5/6, 7/8 l Guard interval: 1/4, 1/8, 1/16, 1/32 l Support Hierarchy modulation: 16QAM, 64QAM, Alfa1.2.4 l Support MFN l IF output at 36MHz with 90~107BμV l 2ASI inputs, support ASI loop out l PID filtering and re-mapping l PSI/SI information pick-up, phase and modification l RJ-45 Ethernet interface introduces remote maintenance, supervision and software upgrade. l SFN (single frequency network) l Digital Pre-Distortion l Constant Temperature Crystal l Remote control 1.3 Performance index Data Input Socket 75Ω, BNC, Interface Comply with EN 50083 ASI Standard Interface. Modulation Level Support Hierarchy and Non-hierarchy Modulation Data Format Standard TS stream,188/204byte IF Output Output Impedance 50Ω BNC Output Frequency Range 32~42MHz (Adjustable) Output Level -5dBn( 105dBμV) ±0.2dB Group Delay ±10 ns Stability of Frequency 20ppm @ ±4.25MHz -46dBc(2k), -56dBc(8k) IQ Amplitude Imbalance ≤0.02% Carrier Suppression ≤-55dBc Spurious ≤-60dBc MER ＞42dBc RF Output Output Impedance 50Ω NBC Output Frequency Range 355~860MHz Output Level ≥0dBm(107dBμV) Monitor Signal Level -30+2dBm Total Frequency Deviation ≤0dBm (107dBμV) Output Suppression <-55dBc Output Level Adjustable Range ≥16dB ≥80dBc/Hz (@1Kz) ≥105dBc/Hz (@100Kz) Local Oscillation Phase Noise ≥130dBc/Hz (@100Kz) Bandwidth 6M, 7M, 8M (Adjustable) MER ≥36dB(agile); ≥40dB(Fix) Attenuation 0~16dB( 0.5dB step) Signal Encoding and Modulating Encoding Rate 1/2, 2/3, 3/4, 5/6, 7/8 Carrier 2k, 8k Modulation Mapping Constellation QPSK,16QAM, 64QAM Guard Interval 1/4, 1/8, 1/16, 1/32 Bandwidth 6M, 7M, 8M
 Article From:http://www.fmuser.org