| DIGITAL MICROWAVE LINK DL SERIES |
|
The new DL digital microwave link is used for the transmission of digital data (transport stream) from a signal sourced from a standard MPEG2 encoder or multiplexer, up to 48Mbit/s. QPSK is the type of modulation used, according to the DVB-S standard (EN 300 421), which allows the demodulation of the signal using commercially available equipment for satellite reception. The ASI-QPSK modulator is built in a plug-.in module mounted in a 3HE rack with the other transmission modules. This module has been designed to be used with IF 70MHz transmitting systems and it permits the use of one type of digital modulator for any frequency range. This modulator is suitable for use with most pre-existent analog systems. The FEC and the symbol rate settings could be easily programmed using jumpers inside the module, without the need of any computer or specific software. Also the choice of the input signal, ASI or serial-data, serial clock could be selected by a jumper inside the module. The DL-TX transmitter is available for various frequency ranges and output powers (see the table). The DL-RX receiver is composed of an up converter which down converts the receiving channel into L band (950-2150MHz) and a professional satellite receiver with standard ASI and Audio and Video output signals.The up converter is available in a 1HE rack for indoor use or in an outdoor weatherproof metal case. |