Transmodulator: 2xDVB-T/T2/C - 2xDVB-T (COFDM) TTX-420 FTA TERRA

Code: R81616
Price Disc. Quantity Validity
€460.68 0 % from 1 piece
The 2xDVB-T/T2/C - 2xDVB-T (COFDM) ttx420 FTA transmodulator enables the conversion of DVB-T/T2/C signals from 2 MUXes to 2 DVB-T COFDM MUXes.
• Conversion of DVB-T/T2/C signal from 2 MUXex to 2 DVB-T COFDM multiplexes,
• Selectable operation mode: transparent or multiplexing,
• Channel selection and filtering of unnecessary services in the digital stream,
• Control via RJ-45 port, for a much simpler installation procedure,
• Web-based management,
• Reading history of events (logs) from the panel,
• AGC function (automatic control of signal gain).


4-year warranty.



+++The transmodulator only changes the RF transmission standard from DVB-T/T2/C to DVB-T. This means that the same RF codec is present at the input and output. The original video/audio coding systems cannot be changed and are the same at the output as at the input.
TERRA TTX-420 R81616 transmodulator is used for reception of DVB-T/T2/C signals and for change of their parameters (regeneration, filtering, retransmission in different RF channels etc.) according to the needs of the project. The device can receive whole sets of channels from two free-to-air DVB-T/T2/C multiplexes and convert them into two neighboring DVB-T multiplexes with maximum data rate allowed by the DVB-T standard, i.e. 31.68 Mbps. In practice, each multiplex can carry 6 SD channels or 2-3 HD channels. The administrator of the system selects the required channels from the satellite input streams and forms two DVB-T multiplexes. Alternatively, one DVB-T multiplex can be programmed from channels coming from two different DVB-T/T2/C multiplexes. In each case, it is neceeesary to remember about 10% safety margin when determining the maximum bit rate for the whole multiplex (typically the ultimate bit rate of a multiplex in multiplexing mode should not exceed 29 Mbps). The output DVB-T COFDM multiplexes are usually distributed to users by a passive network composed of RF splitters/taps. Such a solution is especially convenient in modern hotel TV systems distributing a variety of channels, including HD broadcasts.
The application of TTX-420 R81616 transmodulator 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. It happens in areas with low signal quality.
The regeneration process consists of receiving the DVB-T/T2/C 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 - without PID filtration;
  • multiplexing mode - the device examines the decoded transport stream (measures the bit rate, updates SI arrays) and optionally filters programs and services.
Thanks to RJ-45 Ethernet port, the programming of the TTX-420 R81616 panel is performed via a web browser.
A great advantage of the Terra device is easy integration with other components:
Customers can also order DVB-T/T2/C--> DVB-C (QAM) transmodulators:
  • DVB-T/T2/C to 2xDVB-C (QAM) Terra TTQ-420C (two CI slots)
  • DVB-T/T2/C to 2xDVB-C (QAM) Terra TTQ-420
The R81616 units can be mounted on the R82538 or R82539 DIN rail (also in a RACK cabinet) and powered from DR-60-12 R82532 or UP413 R82533 power supply.
Key features
  • conversion of DVB-T/T2/C signals to DVB-T COFDM,
  • conversion of multiple signals from two DVB-T/T2/C multiplexes to 2 neighboring DVB-T multiplexes,
  • possibility to create one DVB-T multiplex from two different DVB-T/T2/C multiplexes,
  • transparent regeneration of DVB-T/T2/C stream (without changing the structure or services);
  • change of the RF channel of DVB-T multiplex(es),
  • selectable channels and services in output stream (in multiplexing mode)
  • easy control via RJ-45 port,
  • management via the Internet,
  • access to event history (logs),
  • automatic gain control (AGC).
View of the information window of TTX-420 R81616 module
(among others: input level, SNR, VBER parameters)
IPTV Streamer: TERRA sdi 480 (DVB-S/S2 to IP, USB port)
Selection of channels and filtration of services
IPTV Streamer: TERRA sdi 480 (DVB-S/S2 to IP, USB port)
With these parameters, the maximum bandwidth of each of the two DVB-T multiplexes
is 31.68 Mbps, in compliance with the DVB-T standard
The percentage of the usage of the available bandwidth in each multiplex

Set of ttx410C R81615 and tdx410C R81617 transmodulators used in an SMATV system. For the reception of pay-TV channels it is necessary to install suitable conditional access module.


Product type Transmodulator
Name ttx420
Conversion DVB-T/T2/C--->DVB-T
RF input No. of MUXes supported 2
Number of F-connectors 1
Channels FTA (uncoded) Yes
Coded (CI slot) No
Specyfikacja techniczna
RF input Frequency range MHz 47...862
Power supply/control DC 12 V/0,1 A
standard DVB-T/T2/C
Modulation DVB-T: QPSK, QAM16, QAM64, DVB-T2: QPSK, QAM16, QAM64, QAM256, DVB-C: QAM16, QAM64, QAM128, QAM256
Channel bands MHz 7, 8
Symbol rate Ms/s 1...7,2 for DVB-C
Signal strength dBµV 40...80
Impedance Ohm 75
RF throughput - gain dB -1 ± 1
RF output standard DVB-T/ISDB-T
Number of DVB-T MUXes 2 (nearby)
Modulation DVB-T: QPSK, QAM16, QAM64, ISDB-T: QPSK, DQPSK, QAM16, QAM64
Frequency range MHz 100...858, step 100 kHz
Signal strength dBµV 90
Signal pos. adjustment dB 0...15 with step 1 dB
Impedance Ohm 75
MER dB ≥38 (100...780 MHz), ≥35 (780...860 MHz)
Channel bands MHz 7,8
Security interval 1/4, 1/8, 1/16, 1/32
FEC 1/2, 2/3, 3/4, 5/6, 7/8
FFT mode 2K
Bandwidth Mbps 2 × 31,67
RF combiner Frequency range MHz 47...862
Connector F
Configuration Port RJ-45 (web browser)
IP address
Remote Yes
Current drawn V/A DC 12/0.65
Operating temperature °C 0...+50
Weight kg 0,9
Dimensions mm 48,5 × 198 × 112