8PSK/COFDM FTA Receiver for MMH-3000) TERRA TDX-311 (8PSK/COFDM FTA Receiver for MMH-3000) Code: R81711

TERRA TDX-311 (8PSK/COFDM FTA receiver for MMH-3000) TERRA TDX-311 (8PSK/COFDM FTA receiver for MMH-3000) Code: R81711

View of the receiver TDX-311 R81711 module has been designed for use in the MMH-3000 headend (in the Base Unit UC-380 R81700). This DVB-S2 (8PSK/QPSK) receiver / DVB-T (COFDM) modulator (also called as transmodulator) is used to receive free to air (FTA) channels. One device is sufficient for a whole transponder (even more than a dozen programs) which is transformed into DVB-T multiplex. It is worth to notice that the bandwidth of satellite transponders is usually greater than the capacity of DVB-T multiplexes. The maximum bitrate at the output of TDX-311 module is 31.66 Mb/s. In practice, it translates into 7 channels of standard definition (SD) or 3 channels in high definition (HD). Selecting the channels, the user should include a 10%...15% safety margin due to changeable bitrate of the channels (by determining the maximum bitrate for the whole multiplex, which should not exceed 29 Mb/s). In the case when the desired channels from the transponder require more than 32 Mb/s, the MPEG-2 TS stream from the transponder can feed additional receiver(s) TDX-311 R81711 or DVB-T modulator/remultiplekser TRX-360 R81709. The channels received from a transponder can be selected according to the needs. The condition is just not to exceed the maximum bitrate at the modulator output. In order to save bandwidth, it is also possible to filter unused services (unnecessary audio tracks, teletext). The module, similarly to all components of TERRA headend, can be configured using free Terra Link or paid CMH Master R81706 software.

View of the main configuration window of TDX-311 R81711. The bitrate of the output multiplex takes 86% (27.51 Mb/s from 31.66 Mb/s) of the device capacity.

1 TERRA TDX-311 (8PSK/COFDM FTA receiver for MMH-3000)

The window for selecting desired channels and eliminating unnecessary services More on MMH-3000 headend you can read in the article : Modular Headend TERRA MMH-3000 . Specifications Name TDX-311 Code R81711 Frequency range 950 - 2150 MHz Input level / impedance 45-85 dBµV / 75 Ω RF input Modulations QPSK, 8PSK (DVB-S/S2) Symbol rate 1-45 MS/s LNB power 0/18 V, 500 mA RF loop frequency range 950-2150 MHz Frequency range 110-860 MHz Ouput level / impedance 90 dBµV / 75 Ω C/N > 50 dB MER > 35 dB RF output Modulations QPSK, QAM16, QAM64 Channel width 7/8 MHz Guard Interval 1/4, 1/8, 1/16, 1/32 FEC 1/2, 2/3, 3/4, 5/6, 7/8

2 TERRA TDX-311 (8PSK/COFDM FTA receiver for MMH-3000)

Transmission mode 2K Maximum bitrate 31.66 Mb/s Output level adjustment 0...-15 dB, 0.5 dB step Power 5.5 VDC, 1.5 A Weight 0.7 kg Dimensions 47.5x117x220.5 mm Electrostatic discharge caution

The module contains electrostatic sensitive components. To minimize electrostatic discharge, observe the following precautions:

• Do not remove module from its anti-static plastic bag until you are ready to install it into the base unit. • Hold the module only by its front panel. • Do not place the module on an unprotected surface. Immediately after you remove the module from the base unit, you must insert it into its anti-static plastic bag. • When the module is not in use, keep it in its anti-static plastic bag. • Do not ship or store the module or base unit in/near strong electrostatic, electromagnetic or radioactive fields.