DTV-200 DIGITAL TV TRANSMITTER

System composing:

Modulator: modulate the MPEG standard TS stream to IF.

IR/RF Exciter: up converse the IF frequency to the RF signal needed.

Switch Splitter: auto-execute the selecting function of the exciter and required power splitting.

Power Amplifier: designed to broadband amplification technology , cover the whole UHF band and the output power is 200WRMS.

Power Combiner: incorporate design is used , temperature and non-stability detecting port is pertained to it.

Filter: used to filter harmonic frequency and enhance attenuation outside a channel of transmitter RF band.

Controller: nerve center of the entire system , detect the exciter , power amplifier , splitter and combiner , power supply and cooling part so as to maintain the whole system running in security.

Power supply splitter: accomplish the distribution of input 380V and 220V , and cooperate with controller to control the cooling system.

1, The transmitter compatible design concept: transmitter can involve one of DVB-T, ADTB-T or DMB-T compatibly. And it can broadcast conventional analog-transmitting items after adding some module into the exciter.

2 The exciter includes I.F. pre-corrector, ALC/AGC controller, local oscillator that can be arbitrarily set, up-converter and low-power amplifier. In addition, it has self-protection module.

Power-amplifier can cover the total band of UHF and be available to MUDS. Adopting imported

3 LDMOS-FET module-based design can give great reliability and consistency. Involving minimum high-power switching power supply which is greatly efficient and reliable solves the touch reliability problem incurred by long-term high current with the method of module design. The involving also leverages the construction of entire transmitter. Furthermore, it can provide users great convenience in maintenance.

4 Control system adopts the concept of a running one and a ready one. Popular touching screen is a part for people to control the transmitter and it can receive the TV signal transmitted. It helps the monitoring when the transmitter is broadcasting. The input interfaces include RS232, RS485, E-LINK, simplified input one remotely controlled by signal level and one that remotely controlled the ready one.

5 Switching splitter box is construction like terrace. It can match any exciter produced by any corporation through the configuration of the small box.