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No. 28/2022 (September 12, 2022)
To use the wireless charging it is necessary to send quite a lot of energy over a distance of several meters. Another problem is that energy transmission using light poses a danger to the eyes and skin. This issue has been solved with retroreflectors which reduce power if they detect an obstacle. If another object appears in the field of the light beam, the transmission power is immediately reduced, the system switches to safe mode.
The transmitting device uses an optical amplifier made of erbium-doped fiber, which produces a beam of infrared light with a wavelength of 1550 nm to emit scattered light. The light beams go to a receiver, which has a spherical lens. It focuses the light into a photovoltaic cell that produces electricity. During the test, 400 mW of energy was transmitted over a distance of 30 meters, where a 10 x 10 mm receiver converted it into 85 mW of electricity. This is not much – enough for a small sensor, for example – but the researchers hope that further development of the project will make it possible to charge, for example, smartphones.
Wireless charging capability will reduce the need to carry chargers, which will not only make our lives easier, but will also provide new opportunities for building communication systems, where power wiring will not have to be installed anymore. The system is also expected to have the ability to charge multiple receivers simultaneously.
Smart City – DVB-T2 antennas installed quickly and without tools.
SMART HORIZON A2230 and SMART CITY A2010 are directional TV antennas designed to receive DVB-T2 digital terrestrial TV in the UHF band. They are made of aluminum with galvanized steel structural elements, so they have increased resistance to weather conditions. Black ABS plastic elements ensure stability and aesthetics. Reinforced bar of the antenna (main section) guarantees high mechanical resistance (to wind, birds). Due to the high gain in passive mode, the SMART HORIZON A2230 antenna is designed for use in SMATV systems and at greater distances from the transmitter in individual systems, while the compact dimensions of the SMART CITY A2010 antenna allow installation on a balcony or in a window. The antenna is easy and fast to install, and this requires no tools.
High gain of the antenna in passive mode and the possibility of switching on the signal amplifier built in the antenna box cause that the antenna can receive the signal even 80-100 km from the transmitter. This has been proven in field tests. Note, however, that this depends on a number of factors such as the strength of the transmitted signal, local terrain conditions, local interference etc. |  |
The SMART CITY A2010 antenna is dedicated to places up to 40 km from the transmitter or to compact urban areas, where in the "compact" version and active mode, it receives reflected signals from many directions (achieving a stronger signal than on a long directional antenna), and its small size makes it easy to mount, for example, on a balcony. |  |
Thanks to its well-thought-out design, assembling the SMART HORIZON A2230 antenna requires no tools and takes less than a minute.
Group reset and restoring factory defaults in Hikvision devices.
To quickly and effectively reset a larger number of Hikvision devices, such as DVRs, cameras, IP video intercoms, etc. to factory defaults you can use the Batch Configuration application. The software is very user-friendly and, in addition to quick device reset, it offers multiple options to speed up the system configuration process, such as group updates, export of the device list, time synchronization, setting video parameters and many others.
Batch Configuration main window (v3.0.3.8)
After running the program with administrator privileges, it will automatically search for devices in the local network. After selecting, click the +Add button and enter your login details to add them to the program. After adding, select the devices and select the System Configuration -> Restore -> Complete Restoration tab from the upper bar. Once confirmed, the devices will be completely reset to factory defaults.
Computer control from different locations.
In practice, many computer systems are placed in a secure room (protected from burglary), but image viewing and control is required from another point in the building (security room). Unfortunately, the distance of these rooms is limited by the length of the HDMI cable of the monitor and the USB cable of the mouse and keyboard. The solution is to convert these signals to IP transmission. The Signal-HD HDMI to IP converter H3613 enables the user 5e to connect remote (up to 100 m) source of HD content to HD-enabled television/monitor, using one CAT5e/6 cable. It is also possible to extend the USB port e.g. to control the recorder with a mouse and a keyboard.HDMI > IP converter application diagram (point-to-multipoint connection)
Causes of problems with starting optical RF/SAT systems.
Fiber optic cables are increasingly used in SMATV terrestrial and satellite systems. You can read about their advantages in this article. Since this type of cabling is still a novelty for many installers, who have been making such systems based on traditional copper cabling for years, they relatively often have problems in getting them up and running. These problems are usually easy to diagnose and eliminate.
The possibility to replace a copper 9-cable trunk line with a single fiber optic cable with a diameter of 3-5 mm is one of the main advantages of using fiber optic cables in SMATV systems.
The following is a list of the most common causes of faults in fiber optic RF/SAT systems:
- cabling problems from excessive attenuation at splices, connectors, cable bends, and the inability to verify this attenuation. It is often the case that the person installing the antenna set and active equipment connects it to the existing cabling. Installation work should start with checking the condition of the cables, particularly since it is often only one or at most a few cables. The attenuation of the cable can be checked with a light source, such as L5819, and an optical power meter, such as L5815.
- using connectors with the wrong type of ferrule cut: APC instead of PC and PC instead of APC. Many installers do not pay attention to the type of connector connected to the optical transmitter, meanwhile, depending on the manufacturer and model, they may require connectors with straight ferrule, such as FC/PC, SC/PC (blue connectors) or angled ferrule, such as SC/APC (green connectors). A mistake in this regard, in addition to the risk of damaging the connector at the optical transmitter, results in an increase in the attenuation of the connection by about 4-7 dB, which is often almost half of the total optical power budget.
- too strong a signal at the input of optical receivers. If the optical fiber directly connects the transmitter to the receiver (no splitters), it is necessary to use signal attenuators at the input of the receiver. The power of the optical transmitter and the sensitivity range of the optical receiver vary slightly depending on the make and model of the equipment, so be sure of their values by checking the data in the data sheet.
- incorrect connection of FC-type plugs. During installation, it is necessary to correctly position the plug relative to the socket. There is only one position of the socket and plug at which the guide on the connector enters the indentation in the socket. With any other positioning, the socket and plug do not connect properly, despite the nut of the connector being screwed onto the socket. With incorrect installation, a gap is left between the connector and the socket, which prevents signal transmission. You can read more on this subject here.
- too high or too low a level of RF/TV signal at the input of an optical transmitter. Optical transmitters are usually equipped with an AGC circuit that requires a certain minimum level for its proper operation. Before connecting the signal from the antennas to the transmitter, it is necessary to consult the technical specifications of the transmitter related to the acceptable range of signals at the input.
Fiber optic devices used in optical RF/SAT systems are plug & play units. Careful study of the technical data of the devices and awareness of the problems described above, and how to solve them, guarantees 100% success in the implementation of this type of installation.
![Satellite dish: DIPOL DPL-120 [dark graphite, RAL7016]](https://static.dipol.com.pl/images/en/pict/a9684_.gif) | DPL-120 satellite dish A9684 is a professional 120 cm satellite dish, made of steel (external dimensions 115x125 cm), dedicated for SMATV systems in multi-family buildings. The design of the dish meets all the requirements of Polish regulations on equipment for the construction of telecommunications systems in multi-family building, in particular of the regulation MTBiGM of 2012. A dedicated bracket for the second LNB to receive signals from two satellite positions is included. The DPL-120 is mounted to an intermediate dish with 6 screws. It is then mounted on the mast with a bracket made of 3.5 mm thick steel sheet. This guarantees the stability of the shape of the dish and secure attachment even in winds of up to 144 km/h. The antenna is made of 0.8 mm thick galvanized steel, protected by 7-15 µm thick zinc coating and powder coated (paint thickness 60 µm). | |
 | DIPOL SMART HORIZON A2230 is a directional TV antenna designed to receive DVB-T2 digital terrestrial television in the UHF band. The sealed box contains an antenna amplifier with a bypass, which allows the antenna to operate in two modes: passive (antenna gain of 14 dBi), active – activated by 12 VDC (additional gain of 20 dB). Due to its high gain in passive mode the antenna is intended for use in SMATV systems and at longer distances from the transmitter in individual systems. | |
 | HDMI Slim cable 2 meters H1025 meets all the requirements of the HDMI 2.1 standard. It has a small diameter (4 mm) and a short bending radius (40 mm). The cable is used in places where there is not enough space for laying standard cables and where the aesthetics of the installation are particularly important. The cable transmits video and sound. | |
Worth reading
LTE frequencies. Depending on the needs, LTE networks can support frequencies from 700 MHz to 2.6 GHz (large urban areas). Special mention should be made of the MIMO (Multiple Input Multiple Output) technique used in LTE, which allows the signal to be transmitted using multiple antennas.
As mentioned, LTE can operate in a wide range of frequencies. In Europe, the most commonly used frequencies are 800 MHz, 1800 MHz, 2100 MHz and 2600 MHz. In addition, it is important to mention the distribution of bandwidth under 5G 3400-3800 MHz as well as 700 MHz in many European countries.
When choosing an antenna, it is worth buying one that is prepared to work in all bands – so that the router can aggregate multiple bands. One of the recommended antennas is TRANS-DATA KPZ 7/7/7 A741025. It is a MIMO directional antenna designed for... >>>more
As mentioned, LTE can operate in a wide range of frequencies. In Europe, the most commonly used frequencies are 800 MHz, 1800 MHz, 2100 MHz and 2600 MHz. In addition, it is important to mention the distribution of bandwidth under 5G 3400-3800 MHz as well as 700 MHz in many European countries.
When choosing an antenna, it is worth buying one that is prepared to work in all bands – so that the router can aggregate multiple bands. One of the recommended antennas is TRANS-DATA KPZ 7/7/7 A741025. It is a MIMO directional antenna designed for... >>>more
SMART CITY DVB/T2 antenna with bypass up to 40 km from the transmitter
