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Vehicles specifically designed or adapted for the Signal Corps were initially designated by a "K" number. The K-number was later phased out along with the Signal Corps Radio nomenclature system, and was replaced by a "V" number under the Joint Electronics Type Designation System (JETDS).
INS Eilat (K-40), a destroyer of the Israeli Navy; INS Veer (K40), a corvette of the Indian Navy; Piano Concerto No. 3 (Mozart), by Wolfgang Amadeus Mozart; Potassium-40, an isotope of potassium; Redmi K40, a smartphone; Toyota K40 transmission
The radioactive decay of 40 K in the Earth's mantle ranks third, after 232 Th and 238 U, as the source of radiogenic heat. The core also likely contains radiogenic sources, although how much is uncertain. It has been proposed that significant core radioactivity (1–2 TW) may be caused by high levels of U, Th, and K. [2] [3] Potassium-40 is the ...
There are also mechanically compatible connectors such as the K-connector which operate up to 40 GHz. [3] The SMA connector is most commonly used in microwave systems, hand-held radio and mobile telephone antennas and, more recently, with WiFi antenna systems and USB software-defined radio dongles. [4]
The main antenna used for these devices is the printed inverted F antenna (PIFA) consisting of a monopole antenna bent in an L shape, fabricated of copper foil on the printed circuit board inside the device. Small sleeve dipoles or quarter-wave monopoles are also used. The patch antenna is another common type, often integrated into the skin of ...
The IEEE K-band is a portion of the radio spectrum in the microwave range of frequencies from 18 to 27 gigahertz (GHz). The range of frequencies in the center of the K-band between 18 and 26.5 GHz are absorbed by water vapor in the atmosphere due to its resonance peak at 22.24 GHz, 1.35 cm (0.53 in).
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