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Transmodulator DVB-T (regenerator semnal) TERRA ttx311 - SOLDURI!
Cod: R81714
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Receiver DVB-S/S2 CI RDC-313 cu modulator VSB (QPSK/PAL, pentru MMH-3000)
General view
Receiver DVB-S/S2 CI RDC-313 cu modulator VSB (QPSK/PAL, pentru MMH-3000)
The included accessories
COFDM-COFDM (DVB-T) trans-modulator TERRA ttx311 R81714 is used for regeneration of a digital TV multiplex and optionally for conversion of its frequency and filtering some programs. It is one of optional modules that can be mounted in the base unit of Terra MMH-3000 headend.
The Terra TTX-311 R81714 trans-modulator allows for distribution of digital TV channels in situations when the signal received by the antenna cannot be directly amplified or converted to a different frequency due to high BER and low MER levels. These problems occur in areas with poor terrestrial signal levels.

The regeneration process consists of receiving the DVB-T signal, demodulating it to the transport stream, and then re-modulating RF signals as a new COFDM multiplex (frequency converter function). MER modulation error rate at the output of the device is not lower than 35 dB, which allows for the distribution of the digital multiplex even in very large MATV systems.
The device can operate in two modes:
  • transparent mode - the decoded transport stream is not modified and is directly applied to the COFDM modulator;
  • multiplexing mode - the device examines the decoded transport stream (measures the bit rate, updates the SI array) and optionally filters programs and services such as teletext or EPG (it should be noted that in this mode the modulator can only work in 2k mode).
Main functions of TTX-311 R81714 trans-modulator:
  • transparent regeneration of DVB-T stream;
  • changing the frequency of DVB-T multiplex;
  • service filtering: programs, audio streams, teletext;
  • EPG multiplexing;
  • NIT generation;
  • generating new stream descriptors;
  • PMT version monitoring.
The received multiplex can be supplied (as the original MPEG-2 TS) to other modules of the Terra MMH-3000 headend.

The trans-modulator can power an antenna preamplifier (12 V).
The idea of using the ttx311 regenerator

An additional advantage of the device is the possibility of modifying transport stream, very useful in hotels, hospitals, correctional facilities etc. The service filtering option allows for cutting out some channels from the DVB-T multiplex.
Specifications
 NameCOFDM-COFDM (DVB-T) trans-modulator ttx311
 CodeR81714
 StandardEN50083-5 class 2
RF output
 Modulation DVB-T QPSK, QAM16, QAM64
 Channel bandwidth
 7 MHz, 8 MHz
 Guard interval 1/4, 1/8, 1/16, 1/32
 FEC 1/2, 2/3, 3/4, 5/6, 7/8
Transmission mode
transparent 2k, 8k
 multiplexing 2k
 Frequency range
 110...860 MHz (step 0.5 MHz)
 Channel bandwidth adj. (7 MHz) -125 kHz, 0 ,+125 kHz
 Channel bandwidth adj. (8 MHz) -166 kHz, 0 ,+166 kHz
 Attenuator 0...15.5 dB (step 0.5 dB)
 Output level
 90 dBμV
Carrier stability +/-500 Hz
 MER ≥ 35.0 dB
 Impedance 75 Ω
 RF input
 Modulation DVB-T QPSK, QAM16, QAM64
 Frequency range
 104...862 MHz
 Input level
 40...100 dBμV
 Impedance 75 Ω
 Loop gain
 0 ... 3.5 dB
 S/N ≥ 23 dB
Multiplexing
 Max input bitrate 31.5 Mb/s
 Max output bitrate (modulator)
 31.5 Mb/s
 Number of input services
 ≤ 256
 PID filtration
 ≤ 256
Monitoring of
 PMT Yes
 PAT No
 SDT No
 PCR restamping Yes
 EPG (EIT) multiplexing
 Yes
 Other parameters
 Power 5.5 VDC, 1.3 A
 RF preamp. powering
 12 VDC , max. 0.1 A
 Operating temperature
 0...50°C
 Dimensions 47.5 x 117 x 220.5 mm
 Weight 0.7 kg
Retras din ofertă
 
Transmodulator DVB-T (regenerator semnal) TERRA ttx311 - SOLDURI!
Cod: R81714
 
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