View of the included accessories - wall mount, distance lath, RF bridge, termination load resistor

Terra TDX-4168 R81625 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 DVB-S/S2 (8PSK/QPSK) satellite channels and convert them to DVB-T (COFDM) channels. One TDX-4168 R81625 panel can receive all channels from 16 satellite transponders and convert them into two independent groups with four neighboring DVB-T multiplexes (each multiplex 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). 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-4168 R81625 panel is performed via a web browser.

The TDX-4168 R81625 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:

The R81625 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.

Selection of channels and filtration of services

The TDX-4168 R81625 transmodulator creates two independent groups with four neighboring DVB-T multiplexes. With these parameters, the maximum bandwidth of each of the eight DVB-T multiplexes is 31.66 Mbps, in compliance with the DVB-T standard.

Name		TDX-4168 FTA
Code		R81625
Number of supported transponders		16
RF input	Frequency range[MHz]	950 - 2150
	LNB power and control	0/13/18 V & 22 kHz,  max 500 mA , DiSEqC 1.0, EN50607, EN50494
	Level/Impedance [dBμV/Ω]	55-95/75
	RF loop gain [dB]	-1 ± 1
	Standard	DVB-S/S2
	Modulation	QPSK, 8PSK
	Symbol rate [Ms/s]	2...45
	Return loss [dB]	≥ 10
	Number of inputs	2
RF output	DVB standard	DVB-T
	Level/Impedance [dBμV/Ω]	90±2/75
	Frequency range [MHz]	170-230 MHz / 470-862 MHz
	DVB-TMUXes	4 (neighbor.) + 4(neighbor.)
	MER	≥ 35 dB
	Modulation	QPSK, QAM16, QAM64
	Channel width [MHz]	7/8
	Guard interval	1/4, 1/8, 1/16, 1/32
	FEC	1/2, 2/3, 3/4, 5/6, 7/8
	FFT mode	2K
	Level adjustment [dB]	0...-15 (step 1)
Transport  Stream parameters	Max. bit rate [Mbps]	< 31
	Service filtering	Yes
General	RF loop (bandwidth/atten.)	47-862 MHz / ≤ 2.5 dB
	RJ45 Ethernet port	IEE802.3 10/100 Base T
	Power [V/A]	12 / 1.1
	Oper. temp. range [ºC]	0...45
	Dimensions [mm]/Weight [kg]	63x198x112/1.12

 

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