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Junghans Mega
The Junghans Mega was "the world's first radio-controlled wristwatch with hands" JUNGHANS UHREN GmbH, Schramberg (analog watch) in 1991. It was produced by the German watchmaker Junghans, who had already introduced a digital watch called Mega 1 to the market in 1990. Overview Description The Junghans MEGA has a stainless steel case with partial gold overlay. The white dial with two gold hands and a rectangular LCD display is protected by a circular, scratch-resistant mineral glass. The antenna for receiving the time signal from the DCF77 transmitter in Mainflingen is housed in a leather strap (brown or black) with a folding clasp. The watch is equipped with time zone setting, perpetual calendar (day of the week, date, month), digital second, internal time memory, reception control display, and transmitter call button. Technical specifications "The Junghans MEGA watch receives long wave time telegrams (77.5 kHz) from the official German standard ... time signal transmit ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Junghans
Junghans Uhren GmbH is a German watch and clock manufacturer. The company is located in the district of Rottweil, in the town of Schramberg, Baden-Württemberg, southwest Germany. In 1903, Junghans was the largest watch factory in the world and in 1956 it was the third largest chronometer manufacturer right behind Rolex and Omega. The company is owned by local businessman and politician Hans-Jochem Stein (CDU). History On 15 April 1861 Erhard Junghans created the company ''Junghans und Tobler'' together with his brother-in-law Jakob Zeller-Tobler in Schramberg. In 1866, shortly before Erland Junghans died and his wife took over the company, the first Junghans watches appeared. She was succeeded by her sons, Erhard Jr. and Arthur, the latter of whom spent much time in the United States, where he learned innovative American production techniques that enabled the company to market affordable and popular timepieces to the German public. The USA was also the inspiration for the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Analog Watch
An analog watch (American) or analogue watch (UK and Commonwealth) is a watch whose display is not digital but rather analog with a traditional clock face. The name is an example of a retronym; it was coined to distinguish analog watches, which had simply been called "watches", from newer digital watches. It strictly refers to the design of the display, regardless of the timekeeping technology used within the watch movement or module, although its counterpart, " digital watch", usually connotes (in most minds) digital electronics in both. A digital watch is one in which the time is displayed as a series of digits, e.g. "04:32". An analog watch is one in which the display is not digital, but is indicated (typically) by the continuous motion of one, two, or three rotating pointers or hands pointing to numbers arrayed on a circular dial (the hour hand's movement being analogous to the path of the sun across the sky). Reading the time on an analog watch An analog watch has han ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Liquid-crystal Display
A liquid-crystal display (LCD) is a flat-panel display or other Electro-optic modulator, electronically modulated optical device that uses the light-modulating properties of liquid crystals combined with polarizers to display information. Liquid crystals do not emit light directly but instead use a backlight or Reflector (photography), reflector to produce images in color or Monochrome monitor, monochrome. LCDs are available to display arbitrary images (as in a general-purpose computer display) or fixed images with low information content, which can be displayed or hidden: preset words, digits, and seven-segment displays (as in a digital clock) are all examples of devices with these displays. They use the same basic technology, except that arbitrary images are made from a matrix of small pixels, while other displays have larger elements. LCDs are used in a wide range of applications, including LCD televisions, computer monitors, Dashboard, instrument panels, flight instrument ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
DCF77
DCF77 is a German longwave time signal and standard-frequency radio station. It started service as a standard-frequency station on 1 January 1959. In June 1973, date and time information was added. Its primary and backup transmitter are located at in Mainflingen, about south-east of Frankfurt am Main, Germany. The transmitter generates a nominal power of 50 kW, of which about 30 to 35 kW can be radiated via a T-antenna. DCF77 is controlled by the ''Physikalisch-Technische Bundesanstalt'' (PTB), Germany's national physics laboratory and transmits in continuous operation (24 hours). It is operated by ''Media Broadcast GmbH'' (previously a subsidiary of ''Deutsche Telekom AG''), on behalf of the PTB. With Media Broadcast GmbH, a temporal transmission availability of at least 99.7% per year or under 26.28 hours of annual downtime has been agreed upon. Most service interruptions are short-term disconnections of under two minutes. Longer lasting transmission se ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Atomic Clock
An atomic clock is a clock that measures time by monitoring the resonant frequency of atoms. It is based on atoms having different energy levels. Electron states in an atom are associated with different energy levels, and in transitions between such states they interact with a very specific frequency of electromagnetic radiation. This phenomenon serves as the basis for the International System of Units' (SI) definition of a second: The second, symbol s, is the SI unit of time. It is defined by taking the fixed numerical value of the caesium frequency, \Delta \nu_\text, the unperturbed ground-state hyperfine transition frequency of the caesium-133 atom, to be when expressed in the unit Hz, which is equal to s−1. This definition is the basis for the system of International Atomic Time (TAI), which is maintained by an ensemble of atomic clocks around the world. The system of Coordinated Universal Time, Coordinated Universal Time (UTC) that is the basis of civil time implements ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Physikalisch-Technische Bundesanstalt
The Physikalisch-Technische Bundesanstalt (PTB) is the national metrology institute of the Federal Republic of Germany, with scientific and technical service tasks. It is a higher federal authority and a public-law institution directly under federal government control, without legal capacity, under the auspices of the Federal Ministry for Economic Affairs and Climate Action. Tasks Together with NIST in the USA and the National Physical Laboratory (United Kingdom), NPL in Great Britain, PTB ranks among the leading metrology institutes in the world. As the National Metrology Institute of Germany, PTB is Germany's highest and only authority in terms of correct and reliable measurements. The Units and Time Act Bundesgesetzblatt (Germany), Bundesgesetzblatt (Federal Law Gazette), volume 2008, part I, No. 28, p. 1185 ff., 11 July 2008] assigns all tasks which are related with the realization and dissemination of the units to PTB. All legally relevant aspects regarding the units ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lithium Metal Battery
Lithium metal batteries are nonrechargeable primary batteries that have metallic lithium as an anode. The name refers to the metal as to distinguish them from rechargeable lithium-ion batteries, which use lithiated metal oxides as the cathode material. Although most lithium metal batteries are non-rechargeable, rechargeable lithium metal batteries are also under development. Since 2007, Hazardous substances#UN numbers and proper shipping names, Dangerous Goods Regulations differentiate between lithium metal batteries (UN 3090) and lithium-ion batteries (UN 3480). They stand apart from other batteries in their high charge density and high cost per unit. Depending on the design and chemical compounds used, lithium cells can produce voltages from (comparable to a zinc–carbon battery, zinc–carbon or alkaline battery) to about . Disposable primary lithium batteries must be distinguished from secondary lithium-ion battery, lithium-ion or a Lithium polymer battery, lithium-polymer ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Button Cell
A button cell, watch battery, or coin battery is a small battery made of a single electrochemical cell and shaped as a squat cylinder typically in diameter and high – resembling a button. Stainless steel usually forms the bottom body and positive terminal of the cell; insulated from it, the metallic top cap forms the negative terminal. Button cells are used to power small portable electronics devices such as wrist watches, pocket calculators, and remote key fobs. Wider variants are usually called coin cells. Devices using button cells are usually designed around a cell giving a long service life, typically well over a year in continuous use in a wristwatch. Most button cells have low self-discharge, holding their charge for a long time if not used. Button cells are usually disposable primary cells, but some are rechargeable secondary cells. Common chemistries include zinc, lithium, manganese dioxide, and silver oxide. Mercuric oxide button cells were former ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Consumer Electronics
Consumer electronics, also known as home electronics, are electronic devices intended for everyday household use. Consumer electronics include those used for entertainment, Communication, communications, and recreation. Historically, these products were referred to as "black goods" in American English due to many products being housed in black or dark casings. This term is used to distinguish them from "white goods", which are meant for housekeeping tasks, such as Washing machine, washing machines and Refrigerator, refrigerators. In British English, they are often called "brown goods" by producers and sellers. Since the 2010s, this distinction has been absent in Big-box store, big box Consumer electronics store, consumer electronics stores, whose inventories include entertainment, communication, and home office devices, as well as home appliances. Radio broadcasting in the early 20th century brought the first major consumer product, the radio receiver, broadcast receiver. Later ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Receiver (radio)
In radio, radio communications, a radio receiver, also known as a receiver, a wireless, or simply a radio, is an electronic device that receives radio waves and converts the information carried by them to a usable form. It is used with an antenna (radio), antenna. The antenna intercepts radio waves (electromagnetic waves of radio frequency) and converts them to tiny alternating currents which are applied to the receiver, and the receiver extracts the desired information. The receiver uses electronic filters to separate the desired radio frequency signal from all the other signals picked up by the antenna, an electronic amplifier to increase the power of the signal for further processing, and finally recovers the desired information through demodulation. Radio receivers are essential components of all systems based on radio technology. The information produced by the receiver may be in the form of sound, video (television), or digital signal, digital data. A radio receiver may b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1991 In Technology
It was the final year of the Cold War, which had begun in 1947. During the year, the Soviet Union collapsed, leaving fifteen sovereign republics and the CIS in its place. In July 1991, India abandoned its policies of dirigism, license raj and autarky and began extensive liberalisation to its economy. This increased GDP but also increased income inequality over the next two decades. A UN-authorized coalition force from 34 nations fought against Iraq, which had invaded and annexed Kuwait in the previous year, 1990. The conflict would be called the Gulf War and would mark the beginning of a since-constant American military presence in the Middle East. The clash between Serbia and the other Yugoslav republics would lead into the beginning of the Yugoslav Wars, which ran through the rest of the decade. In the context of the apartheid, the year after the liberation of political prisoner Nelson Mandela, the Parliament of South Africa repeals the Population Registration Act ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
