Photo of a relay that switches the load from lighting 10-12 volts 120 watts. Scheme, description

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Photo of a relay that switches the load from lighting 10-12 volts 120 watts. Encyclopedia of radio electronics and electrical engineering

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Encyclopedia of radio electronics and electrical engineering / Clocks, timers, relays, load switches

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The device responds to changes in illumination and allows you to turn on / off various devices. The total load power is 120W. Upit.= 10...12V.

Photo of a relay that switches the load from lighting 10-12 volts 120 watts. Photo relay

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Restoring infrastructure to provide communication services to the local population has become a priority for the authorities in Puerto Rico and the United States. The natural disaster that raged there - Hurricane Maria, which destroyed communications and facilities in its path - did not bypass the residents of the Virgin Islands, also owned by the United States. To quickly eliminate the consequences of the devastating cyclone, the Federal Communications Commission allocated $ 77 million necessary to restore communications in the archipelagos.

Part of the budget funds of American taxpayers will go to the installation of new cell towers, while the other part will go to more progressive and advanced solutions in the communications field. The latter include an initiative called Project Loon, a joint effort between Alphabet and AT&T operators, together with T-Mobile.

In addition to the launch of Project Loon, AT&T management announced a trial run of an alternative to bulky balloons - "temporary 4G towers" based on Flying COW (Cell on Wings) unmanned aerial vehicles. With the help of these drones, AT&T will provide local residents with access to voice services and the ability to text in the area affected by the hurricane.

For AT&T, the launch of the Flying COW series mini-helicopter in Puerto Rico was the first tentative, but no less successful step towards the mass introduction of "flying communication towers." Such drones rise to a height of 60-120 m, which allows them to cover an area of about 100 km2 with a wireless network. At the same time, COW UAVs are deprived of the ability to fully maneuver due to being tied to the terrain - a cable connection to a base station on the ground.

At the moment, the first Flying COW drone is deployed in the airspace over San Juan, the largest city in Puerto Rico. In the future, it will be moved to a new location depending on the current needs of the population in connection.

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