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No. 7/2017 (Feb. 13, 2017)
A Holy Grail of physics!
Scientists from Harvard University claim that they have obtained a sample of solid metallic hydrogen. The importance of the achievement can be underlined by the fact that the search for hydrogen in this state has been lasting for over 80 years! In standard conditions, in contrast to other elements of the first group, hydrogen is not a metal but a gas.A hydrogen sample was squeezed at ultra-cold temperatures between two flat-tipped diamonds, under pressure amounting to 495 GPa. Such solid metallic hydrogen is thought to be a superconductor, able to conduct electric current without any resistance. Importantly, if the solid hydrogen is meta-stable (which means that after forming it under high pressure its state does not change after returning to normal conditions), the superconducting properties should also be retained at room temperature.
"Making metallic hydrogen at Harvard"
The "new" state of the element has the potential to revolutionize everything, from electric power grid to high-speed computers, as well as can be a unique rocket fuel accelerating the implementation of plans of space exploration. Such fuel would probably be four times more efficient than the currently available rocket propellants. Hydrogen in this form could also play a vital role in the life of every human being, e.g. facilitating magnetic levitation in high-speed trains, improving performance of electric cars etc.
Multiswitch SMATV system in Krakow.
CEL company has installed a multiswitch SMATV system for 75 subscribers, the occupants of a housing development in Krakow. The antenna system distributes satellite channels from two satellite positions (Hotbird 13.0E and Astra 19.2E), DVB-T broadcasts, FM and DAB radio stations. The whole system has been based on TERRA solutions and equipment. |  |
The distribution system includes amplifier for 9-input multiswitches, Terra SA-901 R70901, which also supplies power to all active components of the system. The 9-cable bus is split into the staircase subnetworks with the use of SS-9XX taps providing signals to MV-9xx multiswitches with suitable number of outputs. Before injecting into the multiswitch system, terrestrial TV and radio signals are amplified and equalized by the Telmor WWK-951 R89861 amplifier. Thanks to power supply from the remote Terra SA-901 R70901 amplifier, there was no need for connections to AC power network in the locations of the multiswitches.
The wiring has been made of Triset-113 cables - the E1017 gel-filled cable with black PE coating has been laid outdoors, and the E1015 white cable with PVC sheath has been deployed inside the buildings. High reliability of the system is also achieved by the application of professional MASTER E80342 compression connectors.
Types of HDMI converters/extenders - part 1.
Signal-HD H3606 HDMI to IP converter enables the user to connect remote (up to 100 m) source of HD content to HD-enabled television/monitor, using one CAT5e/6 cable. The set includes transmitter and receiver units, as well as remote control extender for a Blu-ray/DVD player, STB etc.Distinguishing features:
- Transmission via a single Cat. 5e/6 cable
- UDP/IP protocol (multicast)
- Possibility of using point-to-multipoint topology
- Support for 1080p mode
- Remote control extender
- Maximum length of cable: 100 meters
An application of the HDMI > IP converter/extender (point-to-point)
IP signal coming from the transmitter may be applied to an Ethernet switch to split it among multiple receivers. The bit rate of the compressed signal at the output of the transmitter is about 30 Mbps. In the example below, one needs to buy two additional H3607 receivers.
Diagnostics of optical links.
Beginners in the field of fiber optic systems are often reluctant to purchase equipment allowing professional measurements of optical links. However, a stable optical laser source and an optical power meter can, in most cases, give the answer to the question "why does the link not work?"
The devices connected on two sides of an optical path allow for the measurement of its attenuation (the output power level of the source is precisely known, the meter measures the actual level at the end of the link). In the case of an irregularity, the installer can then measure the attenuation of any part or component of the link, e.g. of patchcords.
The need for the measurements is particularly essential in situations where the cabling is to be used, for example, by independent service providers in the future. Depending on the type of the service, the attenuation of optical paths can be critical for the implementation of e.g. a PON providing TV programming and access to the Internet.
Dynamic IP address and access to CCTV devices.
Hikvision has introduced a new platform, Hik-connect. The platform is based on cloud computing and supports DDNS service. DDNS (Dynamic DNS) is a service that assigns fixed domain names to dynamically changing IP addresses. This service is very useful when an ISP does not provide users with fixed IP addresses. The necessary condition for using DDNS is to have a public IP address and ensure access from the external network to the appropriate ports of the DVR/NVR (server and http, by default 8000 and 80). The next step is to link the device with the Hik-connect account. For this purpose the user has to enter the serial number of the device and verification code.
The principle of operation of DDNS on the www.hik-connect.com platform
The device is linked to the Hik-connect account on a permanent basis. The user can access it via a web browser, iVMS-4200 and iVMS-4500 applications. To get access via a browser, the user has to log in to her/his account.
An application of ROPAM wireless control kit.
The RF-4-2K G7060 kit can be used to control an alarm system, gates, ramps, etc. using key fobs. The controller has two relay and two OC outputs. The relay outputs can, for example, control two gates, whereas the two OC outputs can be used for other purposes. After employing the RM85-12V-1P G7055 relay modules, the user can remotely control any 230 VAC appliances with current consumption up to 12 A. In the example below, these are two independent circuits with lamps around a facility.
The application of the ROPAM wireless control kit and relay modules for remote control of lighting systems
 | Ceiling IP Camera Sunell SN-IPR/04VD/M(II) K1633 is equipped with APTINA 1/2.7" CMOS image sensor with resolution of 1920x1080 pixels (Full HD) and IR illuminator with range up to 35 m. The 2.8 - 12 mm lens has horizontal viewing angle adjustable within 89° - 35° range. The camera has been designed for indoor or outdoor operation in professional IP CCTV systems based on NVRs. | |
 | DVD Shelf Signal DVD-293 (3 levels) E93603 has been designed for holding home devices like DVD/Blu-ray player/recorder, sat receiver, set-top box etc. The maximum load capacity of each level is 8 kg. Glass shelves are made of tempered glass of 5 mm thickness. The support has been made of aluminum - it is light and very stable. Cable management system allows user to hide connecting cables. | |
 | Universal Antenna Mount USBC-38/400-Z (wall/balustrade) E8874 made of steel has been designed for installing satellite or terrestrial antennas. It can be easily mounted to a wall or balustrade. In the latter case it is necessary to buy E9292 U-bolts. The mount has indents that allow for placing the antenna cable under the base and pulling it through the tube. | |
Worth reading
SAT/DVB-T/FM antenna system in a single-family home. This universal solution provides independent DVB-S/S2, DVB-T and FM signals to 4 outlets. The terrestrial DVB-T signals are received by the professional VHF (174-230 MHz) and UHF (470-790 MHz) DVB-T antenna set A2810. Thanks to a special construction, the VHF and UHF antenna segments can be set to the vertical (V) or horizontal (H) polarization of the received signals. This enables the user to adjust the antenna to the local parameters of the broadcast signals, e.g. different polarization in the VHF and UHF bands... >>>more
SAT/DVB-T/FM antenna system with MP-0504L R6944504 multiswitch
providing all the signals to 4 outlets located in different rooms
providing all the signals to 4 outlets located in different rooms
New Terra multiswitches. Four-year warranty now!
