Comtech DM240XR

Digital Video Broadcast Modulator with AutoEQ


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The DM240XR is DVB-S and DVB-S2 capable with the ability to upgrade from DVB-S to DVB-S2 in the field. The DM240XR extends its dominance in broadcast applications through increased data rate capability and the addition of 16APSK and 32APSK support. DVB-S2 performance operating near Shannon's limit offers results with 30% better bandwidth efficiencies (compared with DVB-S) and carrier to noise figures below the noise floor. 

The DM240XR includes the ability to select the output frequency of 70/140 MHz or L-Band operation without any hardware modifications. The modulator offers a frequency agile IF output from 50 to 90 MHz, 100 to 180 MHz and 950 to 2050 MHz in 100 Hz steps. The DM240XR offers high data rates (up to 190 Mbps for the DVB-S2 and 238 Mbps for the DVB-S), and flexible modulation schemes from (QPSK, 8PSK, 16-QAM, 16APSK and 32APSK). 

The DM240XR offers the flexibility to support up to three different data interfaces. The modulator includes a built-in ASI interface along with the Plug-In Interface Card (PIIC) system which allows for the selection of two additional data interfaces that can be easily upgraded in the field. Supported interfaces include DVB-ASI, HSSI, RS-422, M2P/DVB, LVDS M2P/DVB and Ethernet (Pro-MPEG CoP 3 and Bridge modes). 

Remote communications can be achieved through one of three interfaces: Ethernet (Web or SNMP), RS-485, or RS-232. Additionally, FTP capability for firmware upgrades allows a quick, reliable method to update installed systems. The front panel offers push-button control of all features and a backlit LCD display. 

DVB-CID ETSI TS 103 129 is the ETSI standard for combating satellite interference and is largely based on Comtech EF Data’s award-winning MetaCarrier® technology. MetaCarrier technology embeds and detects a small message and unique ID within a video or data satellite carrier. This embedded message and ID significantly reduce the time to identify and clear interference sources. The MetaCarrier is embedded using spread spectrum techniques within the carrier itself without adding appreciable noise or power to the host carrier. 

The DM240XR AutoEQ feature supports amplitude and group delay equalization over the satellite system. When installed, AutoEQ offers the ability to compensate the overall system group delay and amplitude flatness by pre-correcting the uplink carrier. This eliminates the need for external group delay/amplitude equalizers and makes possible equalization at L-Band. The AutoEQ will operate over the full transponder from a symbol rate of 0.1 Msps to 45 Msps. 


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