Scientists at the Daegu Gyeongbuk Institute of Science & Technology have developed a prototype betavoltaic battery that uses C-14 carbon, a radioactive isotope of carbon known as radiocarbon. This isotope only emits beta radiation. These compact and economical energy sources could provide a safe, long-lasting power supply for decades and eliminate the need for regular recharging. Radioactive carbon, a by-product of nuclear power plants, is cheap, readily available and recyclable. Furthermore, d...
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A betavoltaic battery – energy for 1000 years.
DVB-T digital modulators – characteristics and advantages.
Digital Video Broadcasting – Terrestrial (DVB-T) modulators are devices that convert audio-video signals from various HDMI-compatible sources (e.g. recorders, players, decoders, computers) into the DVB-T digital format used in digital terrestrial television. This allows the TV signal to be distributed via the existing antenna system without the need for additional cabling....
+What tools for fiber optic splicing?
Installers often ask what tools to purchase when buying a fiber optic splicer. Several tools are offered with the splicer, including: a fiber stripper and a fiber break guillotine. However, this is not all. Buying several additional accessories is necessary, which can be divided into two groups: absolutely essential accessories and optional tools (the purchase of these is conditioned, among other things, by what kind of cables the installer will hav...
How do I read the labeling of a twisted pair cable?
A twisted-pair cable is a type of signal cable used for data transmission in telecommunications systems and computer networks. Currently, it is most commonly used in analog telephony and Ethernet networks. It consists of one or more pairs of wires that are twisted together to reduce the impact of electromagnetic interference and crosstalk, i.e. interference between pairs of wires....
Control of relays in the IP Villa 2 gen. door station from external buttons.
The IP Villa 2 gen. door stations from the DS-KV8xxx series have two independently triggered relays, which can be used to control a gate, for example. By default, the second relay in the door/gate station is off and should be activated with the iVMS-4200 app or via a web browser. Those outputs can be triggered using the iVMS-4200 PC client application, indoor stations or after shorting to ground (GND) of AIN4 (DOOR2 relay activation) and AIN3 (DOO...
Library new titles
- 2025-03-21
- Video intercom systems
Hikvision currently offers three video door intercom systems: 2-Wire IP, 2-Wire HD and IP system. The choice of the right system for a customer can be dictated by two factors, which include functionality and the type of communication bus between devices.
- 2025-01-02
- About TV & SAT Antennas
Choosing the right antenna is a key issue in any TV system. When looking for a suitable model, the following factors should be taken into account – gain, directivity, mounting location, built-in signal amplifier and the band for which the antenna is tuned.
- 2024-08-25
- Installation Components
One of the criteria for classification of TV systems in hotels is the programming to be distributed. The simplest systems may provide only free-to-air terrestrial TV broadcasts, whereas more advanced solutions will include satellite channels, also some premium ones (pay-TV). The content required by the owner/investor will depend on the categories of prospective hotel guests (foreign and thematic channels etc).
- 2024-07-17
- Some Theory
PoE (Power over Ethernet) is the name of a number of methods that allow for powering network devices through UTP/FTP cables. This way it is possible to power devices such as cameras, phones, switches, access points, etc.
- 2024-06-19
- Measurements
Measurement of DVB-T2 terrestrial television signals and DVB-S/S2 satellite television signals. The technique of measuring DVB-T2 terrestrial digital TV signals is not very different from DVB-T signal measurement.
- 2024-06-12
- HIKVISION
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