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Transmodulator DVB-S/S2 (8PSK, QPSK) la 2xDVB-C (QAM) TERRA TDQ-420 (FTA)
Cod: R81638
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2081,09 Lei2476,50 Lei0 %
DVB-S/S2 (8PSK, QPSK) to 2xDVB-C (QAM) Transmodulator: TERRA TDQ-420
DVB-S/S2 (8PSK, QPSK) to 2xDVB-C (QAM) Transmodulator: TERRA TDQ-420
DVB-S/S2 (8PSK, QPSK) to 2xDVB-C (QAM) Transmodulator: TERRA TDQ-420
Views of the DVB-S/S2 (8PSK, QPSK) to 2xDVB-C (QAM) TDQ420 R81638 transmodulator
DVB-S/S2 (8PSK, QPSK) to 2xDVB-C (QAM) Transmodulator: TERRA TDQ-420
View of the included accessories - wall mount, distance lath, RF bridge, termination load resistor
Key features
  • conversion of DVB-S/S2 signals (FTA) to DVB-C QAM standard,
  • conversion of multiple signals from two satellite transponders to 2 neighboring DVB-C multiplexes,
  • possibility to create one DVB-C 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).
Terra TDQ-420 R81638 DVB-S/S2 to DVB-C transmodulator is used for reception of DVB-S/S2 (8PSK/QPSK) signals, selection of desired channels and retransmission of them in QAM 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 TDQ-420 R81638 panel can receive channels from two satellite transponders and convert them into two neighboring DVB-C multiplexes with maximum throughput of 53 Mbps (no PID filtering). In practice, each multiplex can carry 8 SD channels or 4-5 HD channels. The administrator of the system selects the required channels from the satellite streams and forms two DVB-C multiplexes. Alternatively, one DVB-C 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 50 Mbps). When a higher throughput is required, the system should be equipped with additional TDQ-420 R81638 unit(s). The output DVB-C QAM 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 TDQ-420 R81638 panel is performed via a web browser.
The TDQ-420 R81638 unit is dedicated for receiving FTA satellite channels. In the case of encrypted channels, the suitable model is TDQ-420C R81639.
A great advantage of the Terra device is easy integration with other components:
Customers can also order DVB-S/S2--> DVB-T (COFDM) transmodulators:
  • DVB-S/S2 (8PSK, QPSK) to 2xDVB-T (COFDM) Terra TDX-420C R81619 (two CI slots)
  • DVB-S/S2 (8PSK, QPSK) to 2xDVB-T (COFDM) Terra TDX-420 R81618
The R81638 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.
View of the information window of TDQ-420 R81638 module
(among others DVB-S2 input RF levels, SNR, VBER parameters)
IPTV Streamer: TERRA sdi 480 (DVB-S/S2 to IP, USB port)
Selection of channels and filtration of services
Code R81638
Number of supported transponders
RF input
Frequency range [MHz]       950 - 2150
Power for an LNB / Control0/14/18 V, max 500 mA / DiSEqC 1.0, EN50607, EN50494
Level/Impedance [dBμV / Ω] 45 - 85 / 75
Loop through gain [dB] -1 ±1
ModulationQPSKQPSK, 8PSK, APSK 8/16/32
Symbol rate [Ms/s] 2...452...45
FEC 1/2, 2/3, 3/4,
5/6,  7/8
 QPSK: 1/2, 3/5, 2/3,  3/4,
4/5, 5/6, 8/9, 9/10
8PSK: 3/5, 2/3, 3/4, 
5/6, 8/9, 9/10
Roll-off coef. [%]3520, 25, 35
RF output
Frequency range [MHz] 100...858 (100 kHz step)
Level/Impedance [dBμV / Ω] 90 ±2 / 75
Spurious level [dB] < -60
Loop loss [dB] ≤ 2.5 dB
MER ≥ 40 dB
ModulationQAM16, QAM32, QAM64, QAM128, QAM256
Channel width [MHz]/Symbol rate [MS/s]4...8.3/
Guard interval
 1/4, 1/8, 1/16, 1/32
FEC1/2, 2/3, 3/4, 5/6, 7/8 
FFT mode
Output level adj. [dB] 0...-15 (step 1)
Transport stream parameters
Max. bitrate [kb/s]53000
Max. number of PIDs no filtering
Other specs
RF loop (frequency range/loss)47-862 MHz / ≤ 2.5 dB
Ethernet portIEE802.3 10/100 Base-T (RJ45)
Power [V / A]12 / 0.55
Oper. temperature range  [ºC] 0...50
Dimensions [mm] / Weight [kg] 48.5x198x112 / 0.9


Preţ fără TVAPreţ cu TVARabatValiditate  
2081,09 Lei2476,50 Lei0 %
Transmodulator DVB-S/S2 (8PSK, QPSK) la 2xDVB-C (QAM) TERRA TDQ-420 (FTA)
Cod: R81638
George Popescu
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