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The British Telecom microwave network was a network of point-to-point microwave radio links in the United Kingdom, operated at first by the General Post Office, and subsequently by its successor BT plc. From the late 1950s to the 1980s it provided a large part of BT's trunk communications capacity, and carried telephone, television and radar ...
Microwave is a form of electromagnetic radiation with wavelengths shorter than other ... All warm objects emit low level microwave black-body ... UK and Calais ...
The LRAD is the round black device on top of the New York City police Hummer. The Long Range Acoustic Device (LRAD) is an acoustic hailing device developed by Genasys (formerly LRAD Corporation) to send messages and warning tones over longer distances or at higher volume than normal loudspeakers, and as a non-lethal directed-acoustic-energy weapon.
In contrast, PCM was used mostly in military roles before being picked up for civilian uses. Among its most enthusiastic users was the General Post Office, which at that time ran the long distance calling services in the UK. They introduced a series of PCM-based systems that allowed long-distance links to be much further apart as they could ...
The tower in 2015, after removal of the microwave dishes and installation of modern broadcast and mobile network equipment. Purdown BT Tower, also known as Purdown Transmitter (sometimes written as Pur Down), is a 70.1 metres (230 ft) tall telecommunications tower in Bristol, England.
The depth of penetration depends on the frequency of the microwaves and the tissue type. The Active Denial System ("pain ray") is a less-lethal directed energy weapon that employs a microwave beam at 95 GHz; a two-second burst of the 95 GHz focused beam heats the skin to a temperature of 130 °F (54 °C) at a depth of 1/64th of an inch (0.4 mm) and is claimed to cause skin pain without lasting ...
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