Scientists at MIT have developed tiny wireless antennas that use light to detect tiny electrical signals in liquid environments. The technology is helping to understand how cells communicate and could contribute to a deeper understanding of biological processes, more effective disease diagnosis and the development of new therapies. Monitoring the electrical signals sent by cells is crucial to understanding how organisms function at the molecular level. Previous methods required wires connecting...
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Antennas for DVB-T2 – which one to choose?
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. Of these five factors, the primary and most important parameter in selecting a DVB-T2 antenna is antenna gain. Energy gain is a measurable parameter and is most often given in the unit dBi. In simplified terms, it is how much more “better” a g...
Hikvision IP video intercom system in the guesthouse.
The following diagram shows a Hikvision IP video intercom system installed in a guesthouse, whose parking lot is divided into two zones: A and B. The parking area A and the part of the guesthouse reserved for guests, includes the M2 monitor door station SB(A1) operating wicket F(A1) and entrance gate B(A1) and door station SB(A2) operating door D(A2). The parking zone B and the part of the guesthouse for guests includes the M1 monitor, SB(B1) door station for the F(B1) wicket and B(B1) entrance...
Full access to Sunell's DVR via the Internet without port forwarding.
Library new titles
- 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
Archive library. The information contained therein may be outdated. HikCentral Professional is a complete platform designed to manage Hikvision-branded security systems.
- 2024-05-08
- Measurements
This article summarizes the knowledge for the installer who faces the task of verifying the correctness of a fiber optic system. The article describes in detail all aspects related to the idea and procedures of measurement by the transmission method.
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