coord 50 0 56 N 9 00 39 E type landmark region DE HE display title Image Dcf77.jpg thumb DCF77 in Mainflingen Image Low cost DCF77 receiver.jpg thumb Low cost DCF77 receiver Image Dcf weite.jpg thumb DCF77 range from Physikalisch Technische Bundesanstalt DCF77 is a Mainflingen longwave transmitter longwave ... Technische Bundesanstalt , Germany s national physics laboratory. DCF77 has been in service as a standard ... saving time . Link twice for esthetic reason ref name eecis dcf77 cite web title Time and Standard Frequency Station DCF77 Germany url http www.eecis.udel.edu mills ntp dcf77.html 100503 eecis.udel.edu ... the German network of civil defense siren s. The call sign DCF77 stands for D Deutschland Germany ... es have been very popular in Europe since the late 1980s and most of them use the DCF77 signal to set their time automatically. Time code details Like most longwave time transmitters, DCF77 marks seconds ... zero crossings. Amplitude modulation The DCF77 signal is reduced to 15 power 8 dBFS for 0.1 ... 4 44 pdf dcf77.pdf title Zeit und Normalfrequenzverbreitung mit DCF77 page 6 language german publisher ... per second, between the second marks. During seconds 20 32, the call sign DCF77 was transmitted twice ... en org 4 44 442 dcf77 pm e.htm title DCF77 phase modulation publisher Physikalisch Technische Bundesanstalt ... und frequenz pdf 5 1988 Hetzel Proc EFTF 88.pdf title Time dissemination via the LF transmitter DCF77 ... www.ptb.de en org 4 44 442 dcf77 kode e.htm title DCF77 time code publisher Physikalisch Technische ... minute after the event. class wikitable style text align center DCF77 time code Bit Weight ... 442 dcf77 bbk e.htm title Warnings to the general public by means of CF77? publisher Physikalisch Technische ... www.ptb.de en org 4 44 442 dcf77 1 e.htm Official DCF77 web page at the PTB de icon http www.dcf77.de The atomic clock in Frankfurt Main Germany http qrg.globaltuners.com details.php?id 10730 DCF77 ... of DCF77 during a leap second http www.redesmadrid.com ?page id 4 Bau einer Uhr de icon http www.ptb.de ... more details
SVG map Summary DCF77 range map based on the original and Blank map europe.png. Licensing PD self date August 2007 Orphan image Copy to Wikimedia Commons bot Fbot ... more details
unreferenced date August 2009 Mainflingen is a small settlement of about 3800 inhabitants, a constituent community of the municipality Mainhausen near Frankfurt am Main in Hesse , Germany . It is rather well known for being the site of the Mainflingen longwave transmitter DCF77 radio station which broadcasts the official standard time as given by the atomic clock s of the PTB Braunschweig . The facility used for transmitting the signal of DCF77 is also used for transmitting of some other utility signals in the longwave range. A second facility, called Mediumwave Transmitter Mainflingen Mainflingen C is used for transmitting the programme of the Evangeliumsrundfunk until January 1, 1995 the programme of Deutschlandfunk on the medium wave frequency 1539 kHz. Coord 50 02 N 9 02 E region DE type city display title Category Villages in Hesse de Mainflingen nl Mainflingen ... more details
coord 46.4083555 N 6.2527694 E type landmark region CH VD display title Image HBG Prangins.jpg thumb HBG transmitter in Prangins, Switzerland HBG is a low frequency time signal transmitter for the Swiss time reference system. It currently operates on 75 kHz with 20 kW and is located in Prangins , Switzerland. Due to aging antennas the Swiss Federal Government has decided to shut down HBG on 31 December 2011. Update after 2012 4 Time signal radio stations The transmissions have endet on the 1st. of January 2012. The signal is no longer present. At the beginning of each second with the exception of the 59th , the Carrier wave carrier signal is interrupted for a period of 0.1 s or 0.2 s, which corresponds to a binary 0 or 1 . The transmission of the minute, hour, calendar date, day of the week, month and current year is achieved by means of a BCD code identical to that of DCF77 . Like DCF77, the carrier is not interrupted during the last second of each minute. Differences from the DCF77 time code The carrier frequency. Phase modulation is not included. Amplitude modulation is done by disabling the transmitter 0 power rather than reducing it to 15 power as DCF77 does. Announcement bits warning of impending time zone changes or leap seconds are sent 12 hours in advance, rather than 1 hour. The first pulse of each minute is not a standard 0 bit as DCF77 sends. Instead, it is a double pulse, two 0.1 s interruptions separated by 0.1 s of carrier. A triple pulse signals the start of a new hour, and a four pulse signal is transmitted at noon and midnight. External links http www.metas.ch en labors official time hbg Information page on Swiss federal office of metrology METAS http www.emetteurs.ch gallery Prangin Pictures of the HBG transmitter in Prangins, Switzerland emetteurs.ch http wwwhome.cs.utwente.nl ptdeboer ham sdr leapsecond.html Observation of HBG during a leap second de icon http www.metas.ch root legnet Web Fachbereiche Zeit Frequenz Dokumente HBG short ... more details
A pulse per second PPS is an electrical signal that very Accuracy and precision accurately repeats once per second i.e. with a frequency of 1 Hertz . PPS signals are output by various types of precision clocks, including atomic clock s, radio clock s and some models of GPS receiver s. Depending on the source, properly operating PPS signals have an accuracy ranging from a few nanoseconds to a few milliseconds. Uses PPS signals are used for precise timekeeping and time measurement. One increasingly common use is in computer timekeeping, including the Network Time Protocol NTP protocol. Because GPS is considered a stratum disambiguation Telecoms stratum 0 source, a common use for the PPS signal is to connect it to a PC using a low latency, low jitter wire Electrical connection connection and allow a program to synchronize to it this makes the PC a stratum 1 time source. Note that because the PPS signal does not specify the time, but merely the start of a second, one must combine the PPS functionality with another time source that provides the full date and time in order to ascertain the time both accurately and precisely. See also Precise Time and Time Interval PTTI External links GPS and other time receivers that provide a PPS signal http www.arbiter.com catalog category timing and frequency.php Arbiter Systems, Inc. GPS clocks 40ns to 500ns accurate PPS outputs http www.trimble.com timing Trimble Precise Timing GPS products , Offered 5 Hz formats typically within 25 nanoseconds. http www.garmin.com products gps18oem Garmin GPS 18 , LVC barewire edition only. Offered in 1 Hz and 5 Hz formats. http buy.garmin.com shop shop.do?pID 27594&pvID 14555 GPS 18x LVC and http buy.garmin.com shop shop.do?pID 13195 GPS 18x 5 Hz , a high sensivity replacement for deprecated GPS 18 models http www.meinberg.de english products Meinberg GPS and DCF77 Receivers , dedicated GPS and DCF77 time receivers http hopf.com en index.html hopf Elektronik GPS and DCF77 Receivers , dedicated GPS ... more details
hour. Bit 15 is reserved to indicate abnormal transmitter operation. As extensions to the DCF77 ... archivedate 2006 08 18 de icon http www.leunig.de pro netzwerk funkuhr funkuhren DCF77 TDF.htm Funkuhren Vergleich DCF77 mit TDF Clocks Compare DCF77 with TDF Includes a map showing the different ... more details
DCF is a three letter acronym that may stand for DRM Content Format , one of the Open Mobile Alliance OMA DRM specifications Format of the preloaded contents distributed with nokia phones Roof prism Dach Centre Focus , a type of binoculars dach is German for roof Dallas Christmas Festival Dansk Cyklist Forbund , the Danish bicycle association Data clarification form in clinical trials DCF77 a longwave time signal and standard frequency radio station in Germany. Debt cash flow Deoxycoformycin , an anti neoplastic drug also known as pentostatin Deputy Conservator of Forests India Deputy Conservator of Forests , an officer in the Indian Forest Service Design rule for Camera File system , a specification for digital cameras Designation Challenge Fund for English museums Device Configuration File, an element of CANopen , an embedded systems communication protocol and device profile specification The theory of differentially closed field s Discounted cash flow Distributed Control Framework , a Java programming language Java software framework for robots Disk Copy Fast , a floppy disk software utility Dispersion compensating fibre Distributable cash flow Distributed Coordination Function , a technique used in Wi Fi wireless LANs SCRIPT VS Document Composition Facility , a software package from IBM that handles and formats documents DCF does not handle SSSGML Double clad fiber Child Protective Services Department of Children & Families in the state of Florida The IATA airport code for Canefield Airport , Roseau, Dominica disambig de DCF fr DCF it DCF ja DCF sv DCF ... more details
Image Dcf77.jpg thumb 220px Mainflingen longwave transmitter Mainflingen longwave transmitter is a large facility for commercial longwave transmissions at Mainflingen , Hesse , Germany , which was built in 1956. It uses several T and triangle antennas, which are mounted on guyed masts of lattice steel, insulated against ground. The used masts have heights between 150 and 200 metres. Southeast of the main antenna area, which is completely fenced in, but still north of the motorway A3 there is a further T antenna, which is mounted on two guyed masts of lattice steel insulated against ground. Further there is a tower built of prefabricated concrete segments for mobile phone services close to the transmitter building. All transmitters using the facility have a call sign starting with DCF. The best known of them is DCF77 . In earlier times the facility was also used for longwave broadcasting, especially as backup transmitter for Sender Donebach . See also Mediumwave transmitter Mainflingen List of famous transmission sites External links http www.wikimapia.org lat 50.0161229&lon 9.0120935&z 16&l 0&m h&v 2 multiple Antennas in Wikimapia http www.wikimapia.org lat 50.006622&lon 9.0173936&z 17&l 0&m h&v 2 single Antenna in Wikimapia http maps.google.com maps?ie UTF8&t h&om 0&z 16&ll 50.007491,9.016171&spn 0.005489,0.014462 http maps.google.com maps?ie UTF8&t h&om 0&z 16&ll 50.015695,9.011836&spn 0.005488,0.014462 coord missing Germany Category Towers in Germany ... more details
Image Atomuhr CS2.jpg thumb Atomic clock CS2 The Physikalisch Technische Bundesanstalt PTB is based in Braunschweig city Braunschweig Brunswick and Berlin . It is the national institute for natural and engineering sciences and the highest technical authority for metrology and physical safety engineering in Germany . Part of its brief is the accurate measurement of time. It is responsible for four German caesium atomic clocks , CS1, CS2, CSF1 and CSF2, and the longwave time signal DCF77 . In addition, the PTB operates time server s for the distribution of time on the internet. They are also responsible for the certification of voting machines for the German federal and European elections. History The PTB was originally founded in 1887 as the Physikalisch Technische Reichsanstalt PTR the Physical and Technical Institute of the German Reich . The goal of the organization was supervising and directing calibration and establishing metrological standards. Research areas included spectroscopy , photometry optics photometry , electrical engineering , and cryogenics . Werner von Siemens was instrumental in its establishment. Until 1934 the PTR was part of the Reichsinnenministerium the Reich s Ministry of Interior Affairs . After 1934 it became part of the Reichserziehungsministerium the Reich s Ministry of Education . ref Hentschel 1996 Appendix B, pp. iv vii. ref The Institute s board of directors included Heinrich Konen and Walther Nernst around 1930, Albert Einstein 1917 1933 , Ludwig Prandtl , and Max Planck , as well as representatives from Siemens AG , Krupp , and Carl Zeiss AG Zeiss . Its presidents were Hermann von Helmholtz 1887 1892 Friedrich Kohlrausch 1892 1905 Walther Nernst 1922 1924 Friedrich Paschen 1924 1933 Johannes Stark 1933 1939 Abraham Esau 1939 1945 . Max von Laue was the Physics advisor from 1925 to December 1933. ref Hentschel 1996 Appendix B, pp. iv vii. ref In 1932 the Physikalisch Technische Bundesanstalt had 292 employees 443 in 1937 and around ... more details
Infobox building name Donebach transmitter, Mast 2 image Sender Donebach.jpg caption Donebach Radio Masts building type Radio masts and towers grounded upfed mast radiator location Donebach , Baden W rttemberg , Germany coordinates coord display inline,title 49 33 43 N 9 10 28 E type landmark Status Built completion date 1982 height convert 363 m ft 2 abbr on architect main contractor Deutsche Bundespost The Sender Donebach is a 500 kilowatt longwave radio transmitter operating on 153 kHz and transmitting the program of German public broadcaster Deutschlandfunk . The facility, which is the property of Media Broadcast , was built between 1965 and 1967 on a former airfield and entered service on March 10, 1967. As aerial was used in those days an omnidirectional aerial consisting of four 200 metre high radio masts, which were connected via wires on their tops. From these masts the mast in the middle was fed via radio power. This very efficient transmission aerial led to interferences of the Romanian transmitter Bra ov, working on the same frequency and so only a power of 70 kilowatts instead of 250 kilowatts was possible. But even with these reduced power jammings of Bra ov occurred, so 1972 the radio facility Donebach was rebuilt as a directional aerial with a minimum toward Bra ov. Therefore two radio masts were demounted and the two others were rebuilt as umbrella aerials. Now a transmission power of 250 kilowatts was possible. The Waveplan of Geneva in 1975 set now power limits to the transmitter Donebach and now there was a daytime operation with 500 kilowatts and a nighttime operation at nighttime. Therefore in 1982 two new transmission Remarkable at this facility is, that the frequency of the carrier is derived from a rubidium atomic clock, which is in the station building. It is as the carrier frequency of DCF77 a standard frequency. Geographical coordinates of the masts coord 49 33 36 N 9 10 55 E type landmark region DE coord 49 33 43 N 9 10 28 E type landmar ... more details
Image Casio Tough Solar Wave Ceptor.jpg thumb 250px A Casio Wave Ceptor. This one can receive the signals from WWVB in Fort Collins and both of the JJY signals in Japan. The Casio Wave Ceptor is a line of radio clock radio watch es by Casio . Wave Ceptor watches are able to calibrate themselves to the correct time by receiving time signal s from various government time services around the world. These signals are normally driven directly by ultra accurate atomic clock s, and so by synchronizing with the signals, the Wave Ceptor watches achieve long term accuracy the same accuracy as the atomic clocks that drive the time signals, which is on the order of one second in three million years. The Wave Ceptor watches are not the only radio controlled wristwatches on the market. The German manufacturer Junghans and Japanese manufacturer Citizen Watch Co. also have this feature. Like most radio controlled watches, the Wave Ceptor watches require no setting or resetting of time, date, daylight saving time , or year and like most other watches of this kind, they synchronize at least every 24 hours, usually in the middle of the night. Their long term and short term accuracy is thus better than 500 millisecond ms . As with all radio controlled watches they revert to free running quartz clock quartz accuracy in areas out of range or shielded from time setting signals. The time setting signals usually come from radio emitting towers. However, they are still as accurate as other quartz watches in this mode. The receivers to which the watches can tune themselves vary by watch submodel. CASIO mentions that in Europe, the watches will tune to the low frequency time signal radio station DCF77 located at Mainflingen in Germany or Time from NPL MSF at Anthorn formerly transmitting from Rugby, Warwickshire in the United Kingdom. In Europe the reception range is approximately 1500 kilometres. In the United States, they will tune into WWVB at Fort Collins . In Japan, they will tune to JJY ... more details
File Casio OCEANUS OCW S1350PC 1AJR 01.JPG thumb right 250px Oceanus Manta OCW S1350PC 1AJR br This is the limited model and this one is among 300pcs. Oceanus is the elite line of Casio watches designed for both men and women. The line uses technology from both the G Shock and Waveceptor watch series. Characteristics All Oceanus watches are known for the following key characteristics Analog Watchface All Oceanus watches are Analog clock analog , with some earlier models having a combined analog and digital watchface. 5 Motor Drive present on more of the contemporary models, the 5 motor drive consists of 5 internal motors running independently to control dials for time, stopwatch, seconds, day of week, and hours. Multi band 5 USA or Multi band 6 Japan perhaps the most significant aspect of the Oceanus line is the ability of all watches to automatically synchronize with the Japanese time signal JJY , the American time signal WWVB from Colorado, and the European time signals from both England Time from NPL and Germany DCF77 . The Japanese Multi band 6 models add the Chinese time signal in Shangqiu City, China, at 68.5kHz. Thus, the Oceanus watches will auto synchronize themselves if one is to visit either Europe, North America, Japan, or China Multi band 6 models . Note Not all American Oceanus watches carry the Multi Band 5 Technology as it is relatively new. Only Models 700 and above have the Multi Band Function Sapphire Crystal the watch crystal that encases the Oceanus watch is a Sapphire Transparent and tough Sapphire glass , which is very scratch resistant and found on higher end watches. Oceanus 600 series The Oceanus OCW T600 series wristwatches are the basic oceanus model of a Japanese market. Oceanus CACHALOT The Oceanus CACHALOT series wristwatches are designed imaging marine sports. Moreover, it includes the rotation bezel and the yacht timer chronograph. Oceanus 700 series The Oceanus ocwm700tba series watches are the newest Oceanus watch model in the Amer ... more details
nowrap 10 sup 13 sup nowrap 4 W nowrap 340 gram Time signal Radio time signal DCF77 nowrap 4 x 10 ... ref nowrap 4,6 W ref name meinberg de c51 cite web title Serial DCF77 radio clock Meinberg C51 url http ... ethz ch summer07 DCF77 cite web title ETH IfE Wearable Computing Miniature pocket worn motion sensor with DCF77 clock url http www.wearable.ethz.ch education sada summer07 DCF77 091118 wearable.ethz.ch ... more details
compatible with DCF77. ntsh 77.5 nowrap 77.5 kHz DCF77 DEU Mainflingen , Hesse Vertical omni directional ... dcf77 sende e.htm title DCF77 transmitting facilities author Yvonne Zimber date 2007 05 09 accessdate ... with DCF77 and MSF60 url http www.compuphase.com mp3 h0420 timecode.htm 090917 compuphase.com ref ntsh ... similar to that of DCF77, but requiring a more complex receiver rowspan 3 ntsh 2500 nowrap 2.5 ... 2009 gallery Image Atomic clock.jpg A Low frequency low frequency LF radio clock. Image Low cost DCF77 ... more details
carrier, broadly similar to the current DCF77 Phase modulation DCF77 signal. ref name Lowe2011 ... for PCs Jon Buzzard s excellent HOWTO page for making a WWVB controlled or MSF or DCF77 receiver ... more details
Time transfer is a scheme where multiple sites share a precise reference time. Time transfer solves problems such as astronomical observatories correlating observed flashes or other phenomenon with each other, as well as cell phone towers coordinating handoffs as a phone moves from one cell to another. Multiple techniques have been developed, often transferring reference clock synchronization from one point to another, often over long distances. Accuracy approaching one nanosecond worldwide are economically practical for many applications. Radio navigation Radio based navigation systems are frequently used as time transfer systems. In some cases, multiple measurements are made over a period of time, and exact time synchronization is determined retrospectively. In particular, time synchronization has been accomplished by using pairs of radio telescope s to listen to a pulsar , with the time transfer accomplished by comparing time offsets of the received pulsar signal. One way In a one way time transfer system, one end transmits its current time over some communication channel to one or more receivers. ref cite book last Jones first T title Splitting the second pages 116 publisher Institute of Physical Publishing date 2000 ref The receivers will, at reception, decode the message, and either just report the time, or adjust a local clock which can provide hold over time reports in between the reception of messages. The advantage of one way systems is that they can be technically simple and serve many receivers, as the transmitter is unaware of the receivers. The principal drawback of the one way time transfer system is that propagation delay s of the communication channel remain uncompensated except in some advanced systems. Examples of a one way time transfer system are the clock on a church or town building and the ringing of their time indication bells time ball s, radio clock signals such as LORAN , DCF77 and MSF and finally the Global Positioning System which uses ... more details
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