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

Space reflectors can increase the efficiency of photovoltaic farms.

Engineers at the University of Glasgow have presented an idea and modeled the operation of reflectors orbiting 1,000 kilometers above Earth. Their function will be to reflect sunlight to increase the efficiency of photovoltaic farms.
Simulation models showed that placing 20 reflectors made of a special, web-thin material in orbit 1,000 kilometers above the Earth's surface could reflect sunlight for an additional two hours each day on average. This would help increase the efficiency of solar farms especially after sunset, when the demand for electricity is at its highest. The efficiency of this solution could be further increased by adding more reflectors or increasing their size.

The team has developed an algorithm to determine how the reflectors should be positioned and targeted to most effectively capture the sun's rays, maximizing additional light in the early morning and late evening. The reflectors should maintain an orbit close to the Earth's terminator line, the boundary where daylight on one side of the planet passes into night on the other, and work in a pattern known as the Walker constellation. It is commonly used in satellite communications systems.
The researchers suggest that 20 reflectors could generate an additional 728 megawatt hours (MWh) of electricity per day – as much as is produced by a huge traditional photovoltaic farm, (the size of several thousand hectares), and the cost of the system would be much less.

The idea of orbiting solar reflectors is not new. In the late 1920s, there was discussion of illuminating cities with light reflected from space. Documented work only occurred once, when Russian researchers launched from the MIR space station a 20-meter reflector covered with aluminum foil that was unfolded by a central mechanism. During the tests, the reflector was expected to reflect light equivalent to the power of 3 - 5 full moons, which illuminated the surface of the Earth with a diameter of about 4-5 kilometers. Despite short-term success, the project ultimately failed due to cost and technical difficulties.

Why two network cards in an NVR?

NVRs Sunell are equipped with two network cards to further secure the network. Each network card can be independently addressed, set a different mask and network gateway, giving you the following options:

Hikvision video intercom system in the 2-Wire standard.

There is often a need to replace the existing intercom (video) system with a newer one, offering greater functionality and quality. Such an upgrade may require replacement of the cabling, e.g. with twisted pair cables for IP systems. The Hikvision video intercom operating in 2-Wire standard is of help. It has the same functionality as the 2nd generation Hikvision IP video intercom. Building a compact system involves connecting of monitors (e.g. G74019 DS-KH6320Y-WTE2) and the main door station module (G73646 DS-KD8003Y-IME2) to the G74824 DS-KAD706Y distributor via a 2-wire bus. The 2-Wire bus allows for both, powering the devices and establishing communication. After connecting the distributor to the LAN network, each device (monitor, door station) is visible in the network under a separate IP address. The iVMS-4200(v3) application is used for configuration. In addition to the basic functionality i.e. video calls, the system controls opening the wicket and controlling the entrance gate, also can also be controlled with the Hik-Connect application from a smartphone. It can redirect a call to the phone while the tenant is absent and remotely open the wicket or gate.

HDMI-DVB-T/C digital modulator.

The conversion of A/V signals into high-frequency RF signals, meaning the introduction of signals from all kinds of signal sources, such as computers, players or surveillance cameras, into a terrestrial TV system, is an operation that requires the use of a so-called modulator. Such device has one or multiple A/V inputs (RCA, HDMI, etc., depending on the type) and an RF output (commonly known as the "antenna output), and it allows you to watch the video and listen to the sound on the selected channel on all TVs connected to the system. For the receiver, the program added to the system is just another terrestrial television channel.

DIPOL now offers a new model of digital HDMI modulator for DVB-T/C WS-6990 Signal R86701. Compact size, competitive price, simple installation, and intuitive configuration using buttons on the front panel are features that every installer and user will appreciate.