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TV & SAT TV

DVB-T

Digital DVB-T modulators - assortment and applications
Conversion of baseband audio-video (A/V) signals into radio frequency (RF) channel is called modulation. This process allows for distribution of the signals coming from all kinds of sources, such as computers, DVD players, security cameras etc. through antenna systems. The device used for this purpose (modulator) is equipped with one pair or a set of A/V inputs (SCART, RCA, HDMI) and RF output. The output signal injected into the antenna system is available in the distribution network as additional TV channel (or multiplex - in the case of DVB-T modulator and two or more A/V signals) that can be received by any suitable television connected to the RF network.
RF modulators are not used only in antenna systems (MATV/SMATV). Sometimes, the distribution of signal A/V signals via coaxial cable (after conversion to RF signal) is much simpler and less expensive than other solutions - especially in situations where the signal has to reach multiple points (receivers). An example is an electronics store, where an HDMI -> DVB-T modulator eliminates the problems with splitters and tens of HDMI cables that could be used for the distribution of the demonstration content to tens of televisions.
RF modulators can be divided into two main groups, depending on the character of the output signal - digtal (DVB-T) modulators and analog modulators. Other sub-divisions may be based on the kind and number of inputs (channels), output frequency range etc.
The use of an analog RF modulator is by far the cheapest solution. A digital modulator costs more, but it has a number of advantages associated with the distribution of the signal in digital form (good and identical image quality in the whole network, possibility of distributing HD content, effective use of RF spectrum - several A/V signals can be distributed within one RF channel). DVB-T COFDM modulators equipped with HDMI inputs can distribute over RF network even Full HD 1920x1080_60 p content.
The modulators with HDMI inputs provide excellent solutions for hospitals, stores and shopping malls, supermarkets and electronics stores in which HD content from one or two sources should be delivered to multiple TVs. Such devices are also ideal for MATV/SMATV systems integrated with video surveillance systems - they can distribute the CCTV signal from a modern DVR, containing up to 16 images (in screen division) from security cameras. The images can be watched on any HD television connected to the antenna system.
DVB-T modulators with analog A/V inputs can also distribute CCTV images but with resolution limited to SD standard.
The table below shows differences between DVB-T modulator with analog A/V input (Signal-300 R86300) and Full HD DVB-T modulator with digital HDMI input (Signal-400 R86700).
 R86300R86700
NameSignal-300Signal-400
CodeR86300R86700
StandardDVB-T COFDMDVB-T COFDM
Output; Input
RF; A/V (RCA)RF; HDMI
ResolutionsINOUTINOUT
480@60i480@30p480i@59.94/60FPS480p@30FPS
576@50i576@25p576i@50FPS576p@25FPS
 -720p@50/59.9/60FPS720p@50/59.94/60FPS
1080i@50FPS1080p@25FPS
1080i@59.94/60FPS1080p@30FPS
1080p@59.94/60FPS1080p@30FPS 
SD/HDSDHD
Typestandalonestandalone
Number ofchannels11
Max output level[dBμV]114114
ApplicationsSmall and medium hotels with older TVs, monitoring systems combined with MATV/SMATV...Airports, hospitals, large hotels, stores and shopping malls, electronic stores....

 

High-definition signals with resolution up to Full HD can be distributed within RF network with the use of one-channel modulators Signal-400 R86700, or two-channel modulator Signal-752 R86752 (two independent HDMI inputs, the output RF multiplex can carry content from two HDMI sources).
In the case of an HDMI source and no need for IP streaming, the cheapest solution is the use of the HDMI-DVB-T modulator Signal-400 R86700.
HDMI-DVB-T modulator Signal-400 R86700
The video shows possibilities of DVB-T modulator.
Since September 2014 we sell the Signal-400 R86700 model. The USB interface of this model allows for firmware update, but cannot be used for recording/providing material in .ts format. Any signal source has to provide signal in HDMI format.
Here are several examples illustrating the use of digital DVB-T modulators.
Example 1 - "private" DVB-T channel + IP streaming in a hotel
"Private" Full HD channel with a selected content (including commercials) in hotel TV system comes from a laptop with HDMI output (the source of the signal can also be a desktop PC, Blu Ray, HD player). Additionally, the Signal-751 R86751 device coveys RF signals provided by the UHF antenna Dipol 44/21-69 Tri Digit A2670. All the signals, combined in the built-in RF coupler, are further distributed in a typical RF antenna system. The signal entering the HDMI input of the encoder is also available in the form IP stream at the NMS output (UDP/IP). The IP multicast stream is broadcast by wireless router TP-LINK N3260. The content can be watched on PC computers, laptops and tablets with sufficient processing power, using an appropriate streaming player, e.g. VLC.
UHF TV Antenna: DIPOL 44/21-60 Tri Digit1-way Tap: Signal O-1-14dB (5-1000MHz)1-way Tap: Signal O-1-14dB (5-1000MHz)1-way Tap: Signal O-1-12dB (5-1000MHz)1-way Tap: Signal O-1-12dB (5-1000MHz)DVB-T Modulator Signal-400 (COFDM, HDMI)Access Point TP-Link TL-WR1043ND (w. router & GbE switch, 802.11n, 300Mbps)
Application of the Signal-751 R86751 multifunctional device -
distribution of Full HD signal as a DVB-T channel in hotel TV system
and an IP stream available in WI-Fi network

RF distribution sytem implemented in one of electronics stores. Thanks to the application of the Signal-751 R86751 DVB-T modulator, the commercials in HD quality are distributed to tens of televisions located throughout the store. Additionally, the analog TV modulator TERRA MT-47 R871747 allows for distribution of SD video from any A/V source. The both signals are combined and amplified by the MA-024 R821101 broadband amplifier.
Example 2 - injection of images from IP cameras into antenna system
The modulator Signal-400 R86700 is connected to the HDMI output of the K4516 network video recorder. The HDMI output can provide Full HD video from the IP cameras (e.g. K1680), which modulates the output RF signal of the modulator in the form of a DVB-T multiplex.
DVB-T Modulator Signal-400 (COFDM, HDMI)Managed Switch: TP-LINK TL-SG3216 JetStream (16x10/100/1000Mbps, 2xSFP 100/1000Mbps)Compact IP Camera: Sunell SN-IPR54/04AYDN/M (2MP, 2.8-12mm, 0.05 lx, IR up to 50m)
Injection of images from IP cameras into antenna system

In the case of analog baseband audio-video signals coming from any device, the DVB-T COFDM signals can be formed by any of the three devices: Signal-300 A/V R86300, Terra modules mdx420 R82518 and MD-330 R81713.
  
NameMD-330mdx420Signal-300
CodeR81713R82518R86300
Inputs A/V (RCA)A/V (RCA)
Implementation
Part of MMH-3000 headend
With a set of Terra channel amplifiers;
individual
individual (standalone)
Number of channels
321
SD/HDSDSDSD
Max. output level [dBμV]9085114
Additional information
to be used with  TRX-360OLED display
LCD display
Example 3 - distribution of video signal from analog CCTV camera within antenna system
The signal from n-cam 670 M11284 camera has been provided to Signal-300 R86300 DVB-T modulator. Additionally, the device coveys DVB-T broadcasts coming from UHF antenna Dipol 44/21-69 Tri Digit A2670. All the signals, combined in the built-in RF coupler, are further distributed in a typical TV antenna system via Triset-113 E1015 cable, R-2 R60102 splitters and set of Signal RF taps.
SMPS AC/DC Adapter 12V/1A (for CCTV cameras)Coaxial Cable (75 ohm, class A): TRISET-113 1.13/4.8/6.8 [1m]F-socket - RCA plug adapterCoaxial Cable (75 ohm, class A): TRISET-113 PE (gel-filled) [1m]UHF TV Antenna: DIPOL 44/21-60 Tri Digit2-Way TV/FM Splitter R-2 Signal1-way Tap: Signal O-1-12dB (5-1000MHz)75-ohm terminating resistor in F plug75-ohm terminating resistor in F plug1-way Tap: Signal O-1-12dB (5-1000MHz)1-way Tap: Signal O-1-12dB (5-1000MHz)1-way Tap: Signal O-1-12dB (5-1000MHz)DVB-T Modulator Signal-300 (AV/COFDM encoder & RF modulator)
Distribution of video signal from analog CCTV camera within DVB-T antenna system

Signal-300 R86300 encodes input analog audio-video signal into MPEG-4 stream that modulates RF signal in compliance with DVB-T standard (COFDM). The output signal can be distributed to hundreds of televisions connected to the antenna system.
Example 4 - distribution of video signals from several analog CCTV cameras within antenna system
In this case, the best choice is application of Terra mdx420 R82518 modules. The DVB-T broadcasts received by the A2675 antenna are amplified by the four-channel amplifier at440 R82511.
UHF TV Antenna: DIPOL 44/21-69 Tri Digit w. ampDIN Rail Power Supply DR-60-12 (12VDC/4.5A, for Terra at/mt/ma modules)Four-channel Amplifier: Terra at440 (UHF, DVB-T, AGC) DVB-T Modulator TERRA mdx420 (2xAV/COFDM encoder & RF modulator)3-Way TV/FM Splitter R-3 Signal4-way Tap: Signal O-4 (5-1000 MHz)4-way Tap: Signal O-4 (5-1000 MHz)4-way Tap: Signal O-4 (5-1000 MHz)4-way Tap: Signal O-4 (5-1000 MHz)Subscriber Terminal Outlet: Signal R-TV-SATSubscriber Terminal Outlet: Signal R-TV-SATSubscriber Terminal Outlet: Signal R-TV-SATSubscriber Terminal Outlet: Signal R-TV-SAT4-way Tap: Signal O-4 (5-1000 MHz)4-way Tap: Signal O-4 (5-1000 MHz)4-way Tap: Signal O-4 (5-1000 MHz)4-way Tap: Signal O-4 (5-1000 MHz)Subscriber Terminal Outlet: Signal R-TV-SATSubscriber Terminal Outlet: Signal R-TV-SATSubscriber Terminal Outlet: Signal R-TV-SATSubscriber Terminal Outlet: Signal R-TV-SAT4-way Tap: Signal O-4 (5-1000 MHz)4-way Tap: Signal O-4 (5-1000 MHz)4-way Tap: Signal O-4 (5-1000 MHz)4-way Tap: Signal O-4 (5-1000 MHz)Subscriber Terminal Outlet: Signal R-TV-SATSubscriber Terminal Outlet: Signal R-TV-SATSubscriber Terminal Outlet: Signal R-TV-SATSubscriber Terminal Outlet: Signal R-TV-SAT
Distribution of video signals from 4 analog CCTV cameras within DVB-T antenna system

Two mdx420 TERRA R82518 DVB-T modulators allow for insertion of video from four analog cameras. The output DVB-T signals are distributed via 3-way splitter R60103 to outlets in apartments located in three staircases.
The Terra modules can be conveniently mounted on a universal DIN rail.