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An early Hughes YAH-64 prototype with T-tail. After the AH-56 Cheyenne was cancelled in 1972 in favor of projects like the U.S. Air Force A-10 Thunderbolt II and the Marine Corps AV-8A Harrier, the United States Army sought an aircraft to fill an anti-armor attack role that would still be under Army command.
Sound reinforcement and public address loudspeakers have sensitivities of perhaps 95 to 102 dB SPL for 1 W @ 1 m—an efficiency of 4–10%. Rock concert, stadium PA, marine hailing, etc. speakers generally have higher sensitivities of 103 to 110 dB SPL for 1 W @ 1 m—an efficiency of 10–20%. [citation needed]
Marine VHF radio is a worldwide system of two way radio transceivers on ships and watercraft used for bidirectional voice communication from ship-to-ship, ship-to-shore (for example with harbormasters), and in certain circumstances ship-to-aircraft.
They are ubiquitous in the boating world and used on a number of different marine robotic vehicles. It operates by using a transducer to emit a pulse through the water and listen for echos to return. Using that data, it's able to determine the distance from the strongest echo, which can be the seafloor, a concrete structure, or other larger ...
There were two ⌀3.2 mm negative pins spaced 9.5 mm apart and two ⌀4.0 mm positive pins spaced 14.3 mm apart. Negative and positive pins were spaced 18.1 mm apart. It was used in some early transistor radio amplifiers with a Class B output stage, allowing the loud speaker to be connected between the amplifier output and the battery center tap.
The Google Home smart speaker was released in the US on November 4, 2016, [8] [9] [10] and in the UK on April 6, 2017. [ 11 ] [ 12 ] In May 2017, Google announced that Home would be heading to Australia, Canada, France, Germany, and Japan in middle 2017, [ 13 ] [ 14 ] and the device subsequently became available for pre-order in Canada on June ...
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