DIPOL Weekly Review – TV and SAT TV, CCTV, WLAN

Robot-assisted assembly line can accelerate the pace of new technology discovery.

The process of creating new technologies by scientists can be compared to an engineer with an idea for a new car who must spend hours creating individual components from scratch before experimenting. The possibility of making a flexible screen or a new solar panel begins with the discovery of a new type of material with unusual properties on an atomic scale. However, in the field of 2D materials, which is considered one of the most exciting areas of future electronics, scientists still have to laboriously create each new potential material before they can test its capabilities. Conducted by researchers at the University of Chicago, Cornell University and the University of Michigan, the research presents an innovative method for producing nanomaterials.

The field of 2D materials involves stacking sheets that are each just a few atoms thick. When the layers are so thin, even ordinary materials often exhibit surprising new properties. For example, carbon suddenly exhibits superconductivity, the ability to conduct electricity without loss, when two layers are stacked vertically at a "magic" angle. Scientists are particularly interested in stacking different types of 2D materials. It was recently discovered that by stacking the layers in different ways, the interaction between them can be modified and really exciting new physics can be created. Such a discovery process is slow because researchers must first meticulously assemble these combinations and test them one by one.

Researchers at the University of Chicago have decided to solve this problem by creating something like a tiny production line. However, they encountered some problems because each part of the manufacturing process presented different challenges. First, the researchers had to figure out a way to precisely cut the sheets into the exact shapes they wanted, which is difficult to do cleanly without breaking or damaging them. Through experimentation, they discovered a technique to produce patterns over large areas with very high precision, without contaminating the material. Another challenge was to create a robot "hand" capable of maneuvering these extremely delicate sheets. They came up with a "hand" made of soft polymers that disintegrate when exposed to heat or ultraviolet light. Once the sheet is precisely positioned, the hand dissolves and the sheet falls into place. With this solution, the researchers can now program the appropriate assembly line that creates a material structure with dozens of different layers. In just a few minutes, the assembly line itself creates a sample ready for further testing. In addition to being precise, this entire system offers extensive possibilities for adjusting and rotating each sheet at different angles. Automating this process, which initially seemed unimaginably difficult, will greatly accelerate the pace of discovery.

DVB-S/S2 satellite TV and DVB-T2 digital terrestrial TV in a multi-family building.

Systems based on multiswitches are professional and the most popular way to deliver terrestrial TV (FM/DAB and DVB-T/T2) and satellite SAT (DVB-S/S2) signals to more subscribers. It is the end-user who decides what programs to watch by purchasing the appropriate satellite receiver or by signing an individual contract with one of the digital platform providers. TERRA products, dedicated to use SMATV systems, are primarily top-class equipment covered by a four-year warranty. TV systems based on those components guarantee great signal reception for long.

In one of Krakow's housing estates the multiswitch system has been installed based on TERRA equipment, allowing to distribute satellite and terrestrial TV signals in the new DVB-T2 standard.

LTE network signal amplification.

The Signal GDW-505 A6777 repeater is used to amplify EGSM, GSM, DCS, WCDMA, and LTE signals and bring them indoors. The device is ideal for places where the signal is so weak that making calls or transmitting data via cellular phone is impossible. An example may be a place located far from the transmitter or a building with thick walls, cellars (coffee shops) or modern windows with panes of covered with metallic compounds.

Installation of the Signal GDW-505 A6777 repeater:

• choose a place outside the building where the cellular signal is correctly received,
• mount the outdoor antenna (A741031) so that it faces the GSM base station,
• choose a location for installing the repeater somewhere inside the building to place the indoor antenna in the central part of the building/hall/room to be covered,
• check if the distance between the outdoor and indoor antennas is at least 10 m,
• install the GDW-505 repeater away from heat sources, ensuring proper device cooling,
• check the correctness of the wire connections between the repeater and the antennas (the external and internal antenna sockets are marked accordingly),
• plug the power supply into the 230 VAC socket.

Fire-resistant fiber optics.

Multimedia systems in public buildings and in many cases also in residential buildings are based on cables with increased fire resistance. This is the case of the B2ca class cabling.

DIPOL offers the Prysmian IC-ROUND 02J7A2 L7002 fiber optic cable which can be successfully used both, in multi-family buildings – as a 2J cable connecting a residential box with the telecom room, and in other facilities – e.g. as a cable connecting active Ethernet network elements (switches, routers, media converters, etc.).

The B2ca class cables are referred to as fire retardant cables. The fiber optic cable shown above offers high mechanical resistance. Aramid fibers also provide a basic form of rodent protection.

Preparation of white and black list of license plates on the example of DS-2CD2A25G0/P-IZS license plate identification camera.

The DS-2CD2A25G0/P-IZS K05906 camera is designed to identify license plates and can be used, for example, to control an entrance barrier to a housing estate. The camera can operate autonomously or cooperate with a DVR. If the camera works autonomously, it can import a list of license plates (the so-called white/black list), where after detecting e.g. a plate from the white list, one of the two relays in the camera can be activated, allowing to open the barrier. Import and export of the list is possible after logging in to the camera under Configuration -> Road Traffic -> Blacklist & Whitelist. After accessing the tab, export the clear list with the Export button to save it with the .xls extension. Edit as instructed in the file, that is, enter the sequence number, enter continuously the license plate number, specify whether the plate is to be in the white (1) or black (0) list, and specify the license plate expiration date. After importing the list, setting the arming schedule, and assigning an appropriate relay output to the list, detection of the added plate will result in the barrier opening. The camera can import a list with up to 10,000 license plates.

What is the maximum PoC transmission range?

PoC, or Power over Coaxial, is a transmission system that allows HD-TVI video signal and power to be transferred through a common cable. Coaxial cables or a twisted pair (with an appropriate transformer) with a minimum of 5e category can be used for the transmission. To achieve a sufficient transmission range, quality cables are required such as Tristet or Netset. The maximum transmission distance is shown in the chart below:

DVB-T2/HEVC signal measurement in TV systems. The first European country to begin official DVB-T2 broadcasting was the UK. A test with a TV transmitter was carried out by BBC Research & Development in June 2008. Currently, in the European Union, DVB-T2 signal is broadcast in Austria, Czech Republic, Germany, Belgium, Croatia, Romania and France (DVB-T broadcasting is planned to be switched off only in 2024). TV broadcasts in both, DVB-T and DVB-T2 standards are available from broadcasters in the United Kingdom, Italy and the Scandinavian countries. In these countries, no cut-off date has been set for the DVB-T signal. In Poland, the transition from DVB-T to DVB-T2 is to take place by 30 June 2022... >>>more