DVB-S/S2 (8PSK, QPSK) to 2xDVB-T (COFDM) Transmodulator: TERRA TDX-420 (FTA)

Code: R81618
Price Disc. Quantity Validity
€474.09 0 % from 1 piece
The tdx420 2xDVB-S/S2 (8PSK, QPSK) - 2xDVB-T (COFDM) FTA transmodulator enables the conversion of DVB-S/S2 signals from 2 satellite transponders to 2 DVB-T MUXes.
• Conversion of DVB-S/S2 signals to DVB-T COFDM standard,
• 2 SAT transponders for 2 DVB-T MUXes,
• Unscrambled FTA programs,
• Possibility to create one DVB-T MUX from two SAT transponders,
• 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.



Terra TDX-420 R81618 DVB-S/S2 to DVB-T transmodulator is used for reception of DVB-S/S2 (8PSK/QPSK) signals, selection of desired channels and retransmission of them in COFDM format in chosen RF channels in VHF/UHF frequency range. The device allows the user to receive and manage a range of free to air satellite channels. One TDX-420 R81618 panel can receive channels from two satellite transponders and convert them into two neighboring DVB-T multiplexes with maximum throughput of 31.66 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 streams and forms two DVB-T multiplexes. Alternatively, one DVB-T multiplex can be programmed from channels coming from two different satellite transponders. 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 should not exceed 29 Mbps). When a higher throughput is required, the system should be equipped with additional TDX-420 R81618 unit(s). 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 satellite channels, including HD broadcasts.
Thanks to RJ-45 Ethernet port, the programming of the TDX-420 R81618 panel is performed via a web browser.
The TDX-420 R81618 unit is dedicated for receiving FTA satellite channels. In the case of encrypted channels, the suitable model is TDX-420C R81619.
A great advantage of the Terra device is easy integration with other components:
Customers can also order DVB-S/S2--> DVB-C (QAM) transmodulators:
  • DVB-S/S2 (8PSK, QPSK) to 2xDVB-C (QAM) Terra TDQ-420C R81639 (two CI slots)
  • DVB-S/S2 (8PSK, QPSK) to 2xDVB-C (QAM) Terra TDQ-420 R81638
DIPOL offers the following transmodulators of DVB-S/S2 (8PSK, QPSK) signals:
  TDX-410C  TDX-420   TDX-420C TDQ-420   TDQ-420C
   R81617  R81618 R81619  R81638  R81639 
Code  R81617  R81618 R81619  R81638  R81639 
Input signals
Number of transponders
1 2 2 2 2
Output signals
Number of MUXes
1 2 2 2 2
Max. bitrate [Mb/s]  31.66 2x31.66 2x31.66 2x53 2x53
CI slot(s)
1x no 2x no 2x
The R81618 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-S/S2 signals to DVB-T COFDM standard,
  • conversion of multiple signals from two satellite transponders to 2 neighboring DVB-T multiplexes,
  • possibility to create one DVB-T multiplex from two different satellite transponders,
  • selectable channels and services,
  • 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 TDX-420 R81618 module
(among others DVB-S2 input RF levels, SNR, VBER parameters)
Example of mounting TERRA headend to CD001 housing with DIN rail BD001 R90001. Additionally, there are the SRM-522 R80522 multiswitch and an Ethernet switch mounted on the ID001 R90003 mounting plate. The whole system has the FD001 R90002 ventilation unit with thermostat added.


Product type Transmodulator
Name tdx420
Conversion DVB-S/S2--->DVB-T
RF input Number of supported transponders 2
Number of F-connectors 1
Channels FTA (uncoded) Yes
Coded (CI slot) No
Specyfikacja techniczna
RF input Frequency range MHz 950...2150
Power supply/control 0/13/18 V & 22 kHz, max. 1 A,DiSEqC 1.0, EN50607, EN50494
standard DVB-S2
Modulation QPSK, 8PSK, APSK 8/16/32
FEC 8PSK: 3/5, 2/3, 3/4, 5/6, 8/9, 9/10, QPSK: 1/2, 3/5, 2/3, 3/4, 5/6, 8/9, 9/10
standard DVB-S
Modulation QPSK
FEC 1/2, 2/3, 3/4, 5/6, 7/8
Symbol rate Ms/s 2...45
Signal strength dBµV 45...85
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
Loss dB 2,5
Configuration Port RJ-45 (web browser)
IP address
Remote Yes
Current drawn V/A DC 12/0.55
Operating temperature °C 0...+50
Weight kg 0,9
Dimensions mm 48,5 × 198 × 112