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	Time and Standard Frequency Station DCF77 (Germany)
		Early test results show that the time information received with the help of pseudo-random phase modulation is more resistant to interference and more accurate (standard deviation \approx 10\mu s during the day and \approx 25\mu s at night) than the conventional method using amplitude modulated second marks.
		Since this new modulation method is compatible with previous usage of DCF77, and that the users have made no difficulties known to us, the tests have been extended.
		Announcement bit for a leap second The DCF77 control unit is currently being modified so that in future an announcement bit for a leap second can be sent.
	www.eecis.udel.edu /~mills/ntp/dcf77.html (0 words)

	DCF77
		DCF77 ist der Langwellensender, der die meisten funkgesteuerten Uhren in Deutschland mit der genauen Zeit versorgt.
		Das Rufzeichen DCF77 wird (je zweimal nacheinander) dreimal stündlich als Morsezeichen gesendet (während der 20.
		DCF77 wird von der Physikalisch-Technischen Bundesanstalt (PTB) Braunschweig betreut und sendet seit 1959 eine Normalfrequenz und seit 1973 zusätzlich Datum und Uhrzeit.
	www.guajara.com /wiki/de/wikipedia/d/dc/dcf77.html (601 words)

	DCF77 (Site not responding. Last check: )
		DCF77 radio signals (set by an atomic clock) are broadcast on 77.5 kHz from Mainflingen, Germany, about 25 km south-east of Frankfurt.
		DCF77, Atomuhren und Atomzeit Einführungen zu Atomuhren und Atomzeit, sowie zu DCF77, dem Zeitsignal der Physikalisch-Technischen Bundesanstalt auf Langwelle.
		Funkuhren DCF77 / GPS Zeitsynchronisation Informationen rund um das Thema PC-Funkuhren, DCF77 Zeitsignal aus Mainflingen bei Frankfurt/Main, Aufstelltipps zur Funkuhr, und Anbieter.
	www.serebella.com /encyclopedia/article-DCF77.html (336 words)

	[No title] (Site not responding. Last check: )
		The main parameters which control the front-end filter are the four pulse width limits: dcf77 0 tweak low_zero.070 dcf77 0 tweak high_zero.140 dcf77 0 tweak low_one.165 dcf77 0 tweak high_one.250 which gives the duration in seconds.
		The parameter dcf77 0 tweak disproof 2 controls how many violations are necessary to remove a given second position from the list of candidates.
		The parameter dcf77 0 tweak squelch.33 controls the maximum ratio of missing pulses allowed, and dcf77 0 tweak timeout 600 how long time we try to find sync before we reset the search algorithm.
	phk.freebsd.dk /NTPns/dcf77.txt (643 words)

	DCF77 Info - hopf Elektronik GmbH
		The DCF77 radio controlled clocks receive the official time of the Federal Republic of Germany from Physikalisch-Technischen Bundesanstalt (PTB) in Braunschweig and transmit it to computers and systems via various interfaces.
		The radio synchronisation of the DCF77 transmitter in Mainflingen (50 01 N, 9 00 0) reaches a longterm accuracy of the PTB-calibration standard of 1 x 10 E-13 per week or less than 1 second in 300,000 years.
		In general: the inaccuracy of the received DCF77 timesignal is large compared to the emitted time signal.
	www.hopf.com /en/dcf-info.htm (0 words)

	DCF77 - Biocrawler (Site not responding. Last check: )
		DCF77 is a longwave time signal radio station.
		DCF77 radio signals (set by an atomic clock) are broadcast on 77.5 kHz from Mainflingen, Germany, about 25 km south-east of Frankfurt.
		Radio clocks are popular in this region and use DCF77's signal to set their time automatically.
	www.biocrawler.com /encyclopedia/DCF77 (107 words)

	dcf77 for Linux
		This is the homepage of dcf77, a small program which decodes the signal of a DCF77-clock attached to the parallel-port sold by "Conrad Elektronik".
		DCF77 is a broadcasting-system for radio-time in Germany.
		Because of that you should use dcf77 as seldom as possible.
	0pointer.de /lennart/projects/dcf77 (555 words)

	DCF77 (Site not responding. Last check: )
		DCF77 ist der Langwellensender der die meisten Uhren in Deutschland mit der genauen Zeit
		Das Rufzeichen DCF77 wird zweimal nacheinander) dreimal stündlich als Morsezeichen gesendet der 20.
		Die DCF77 verbreitete Zeitinformation stellt also die offizielle der Bundesrepublik Deutschland dar.
	www.uni-protokolle.de /Lexikon/DCF77.html (607 words)

	Langwellensender DCF77 - MedPort-Lexikon (Site not responding. Last check: )
		DCF77 ist ein Langwellensender, der die meisten funkgesteuerten Uhren im westlichen Europa mit der genauen Uhrzeit versorgt.
		Die Bezeichnung DCF77 ist das dem Sender zur internationalen Identifikation zugewiesene Rufzeichen.
		Die Bezeichnung DCF77 ist das Rufzeichen der Internationalen Frequenzliste des IFRB.
	www.medport.de /lexikon/index.php/DCF77 (837 words)

	Verilog DCF77 Decoder (Site not responding. Last check: )
		DCF77 is a longwave transmitter operated by the "Physikalisch-Technische Bundesanstalt" (PTB) in Braunschweig, Germany at a frequency of 77.5kHz.
		The DCF77 modulation signal from the receiver module is provided to the main input "sigIn" of the module "dcfDecoder" which is directly connected to the synchronization stage "syncStage".
		The DCF77 signal supplied by the receiver module appears asynchronously to the local 10ms clock that is used by the pulse width decoder for extraction of the DCF77 bit information.
	www.i-tip.de /projectDCF/dcfDoku.html (4318 words)

	DjB's Homepage
		DCF77: Deutschland, C als kenteken dat het een lange golf zender betreft, Frankfurt 77,5kHz.
		DCF77 is een tijdsignaal dat op 77,5kHz als tijdsinformatie gecodeerd uitgezonden.
		Een programma kan gebruik maken van de drie uitgezonden DCF77 pariteitbits, dit is niet per se nodig, maar is wel aan te bevelen, de programma's van deze website maken er in ieder geval gebruik van.
	users.pandora.be /djbert/pariteitinfo.htm (1159 words)

	De werking van het DCF77 tijd signaal (Site not responding. Last check: )
		DCF77: Deutschland, C als kenteken dat het een lange golf zender betreft, Frankfurt 77,5kHz.
		DCF77 is een tijdsignaal dat op 77,5kHz als tijdsinformatie gecodeerd wordt uitgezonden.
		Een programma kan gebruik maken van de drie uitgezonden DCF77 pariteitbits, dit is niet per se nodig, maar is wel aan te bevelen, de programma's van deze website maken er in ieder geval gebruik van.
	www.picbasic.nl /info_dcf77_nl.htm (1303 words)

	DCF77 - Das DCF77 - Funksignal
		DCF77 ist ein Zeitsignal und wird auf der Normalfrequenz 77,5 kHz als Zeitinformation in kodierter Form ausgestrahlt.
		Viele nehmen an, dass das Signal in Braunschweig erzeugt und über Leitungen nach Mainflingen weitergeleitet wird, um von dort ausgestrahlt zu werden.
		Der DCF77 Sender steht in Mainflingen (50° 01’ Nord, 09° 00’ Ost), etwa 25 km südöstlich von Frankfurt/Main.
	www.dcf77.de (1431 words)

	Langwellensender DCF77 (Site not responding. Last check: )
		DCF77 ist ein Langwellensender, der die meisten funkgesteuerten Uhren im westlichen Europa mit der genauen Uhrzeit versorgt.
		Die Bezeichnung DCF77 ist das Rufzeichen der Internationalen Frequenzliste des IFRB.
		Wenn nämlich DCF77 das Signal aussendet, erhält es eine Uhr 10 km hinter Frankfurt etwas früher als eine Uhr aus dem Bayrischen Wald.
	www.katastrophenalarm.de /DCF77.html (1292 words)

	About the DCF77 time radio broadcast
		The PTB broadcasts time synchronization signals derived from the cesium clock signal via the transmitter DCF77 operated by the German Telecom Corporation (Deutsche Telekom AG).
		The pulses are read by a serial line driver (tty) of the operating system and parsed by software like the generic parse driver of the NTP daemon.
		Primary source of information about DCF77 is the PTB, but you will find some (though older) information on the Time Synchronization Server too.
	time.fh-augsburg.de /textDCF77.html (604 words)

	bit-tech.net Forums - 7-segment LED Clock
		The decoded DCF77 signal on connector K2 (from the DCF module) is fed into input RA4 (Schmitt triggered input).
		A DCF77 clock only needs the DCF signal to set the time initially after power on (synchronisation usually happens in a few minutes) and afterwards to synchronize the clock every couple of hours.
		DCF77 is just so common in Belgium (was even more before), I just have to replace two more (wall) clocks at home, and then all my clocks will be working on DCF...
	forums.bit-tech.net /showthread.php?t=70643&page=2&pp=20 (2110 words)

	Radio Clocks - Comparing DCF77 and TDF
		DCF77 transmitter of the PTB in Mainflingen, Germany
		The time information is supplied by the LPTF (Laboratoire Primaire du Temps et des Fréquences, now renamed BNM – SYRTE) – an international institution responsible for the central coordination of the UTC (universal time coordinate) and operators of the world's currently most accurate clock, a so-called caesium fountain.
		The deviation between DCF77 and TDF are in the order of only millionths of a second.
	www.leunig.de /_en/_pro/radio-controlled-clock/funkuhren_DCF77_TDF.htm (527 words)

	DCF77 - Das DCF77 - Funksignal
		Das DCF77 Zeitsignal wird von der PTB mittels Atomuhren erzeugt.
		DCF77 setzt sich aus dem BuchstabenDfür Deutschland, dem C als Kennzeichen eines Langwellensenders und dem F wegen der Nähe zu Frankfurt (Mainflingen liegt nahe bei Frankfurt) zusammen.
		Das Rufzeichen DCF77 wird dreimal stündlich, als Morsezeichen, während der Minuten 19, 39 und 59 gesendet.
	www.dcf77.com (1431 words)

	Physikalisch-Technische Bundesanstalt (PTB)
		PTB > Structure > Division 4 > Department 4.4 > Working Group 4.42 > DCF77
		Schematic view of the Mainflingen transmitting station; as inserts: the DCF77 control facilities (on the left), injection into the antenna on the roof of an antenna house, and the transistor transmitter,
		The emission of time signals and standard frequency via DCF77 represents by far the best known and (also geographically) most widely spread procedure to disseminate the legal time realized by PTB for Germany.
	www.ptb.de /en/org/4/44/442/dcf77_1_e.htm (0 words)

	hopf Elektronik - Accuracy between DCF77 and GPS
		During the DCF77 lowering of the second the frequency changes from about 500 Hz to 400 Hz.
		DCF77: Due to the low frequency and amplitude modulation the signal is liable to many interferences from atmospheric, magnetic and electric sources.
		DCF77: Bad short-term accuracy, as a rule +5 to +25 msec, pretty bad characteristics for free-running crystals achievable ± 2 ppm.
	www.hopf-time.com /en/dcf-gps.htm (1769 words)

	DCF77 Atomic Clock Module
		The DCF77 module gives the time of the day as reported by an external DCF77 receptor connected to the board.
		The DCF77 module must be initialized to register a timer handler to poll and analyze the DCF77 input.
		That is, the upper layer calls this operation several times per second and determines itself the frame bit based.
	m68hc11.serveftp.org /examples/group__dcf77.php (327 words)

	DCF77 Test Interface
		This setup consists of DCF77 PWM bit stream decoder, PIC 16F84 microcontroller, and MAX232 level shifter for serial transmission.
		This is the graphical user interface of my Excel 97 work sheet designed to visualize and translate received serial DCF77 data from the PIC microcontroller.
		This is normally carried out within 150 seconds, assuming a clean DCF77 data reception containing a single PWM pulse every second.
	www.electronic-engineering.ch /microchip/projects/dcf77_test/dcf77_test.html (547 words)

	DCF77 ur til gameport under linux
		Simpel DCF77 modtager til PC I stedet for at købe et færdigt DCF77-ur til PC'en, kan man også selv ombygge de fleste DCF77-ure man billigt kan købe på tilbud (ofte 65-70kr).
		Artiklen i Linux Magazin baserer sig på et DCF77 modul fra Conrad Elektronik, men en anden webside "DCF77 for Linux" beskriver hvorledes man kan forbinde PC'en til et vilkårlig DCF77 ur, og det var dette der inspirerede mig til selv at forsøge.
		DCF77 programmer til game/parallel/serielport læser disse pulser og udfra længden afgør om det er 0/1, og over et minut afkodes disse til fuld tid- og datoinformation.
	home3.inet.tele.dk /frda/src/dcf77-fd.html (1482 words)

	RadioClock-Homepage - Detail information about the time
		Throughout Germany, the time signals emitted by DCF77 can be used to keep radio clocks in compliance with Legal Time with an accuracy better than one millisecond.
		The phase time of DCF77 is adjusted such that, at the transmitting antenna, it is kept in agreement with UTC(PTB) in the limits of approximately ±0,3µs.
		To archive this, the phase is keyed according to a random binary sequence (phase-angle deviation: +-12%), the mean value of the carrier phase remaining unchanged.
	www.heret.de /radioclock/ptb.htm (2346 words)

	Time and Standard Frequency Station DCF77 (Germany)
		DCF77 is a long-wave radio transmitter at 77.5 kHz for precise time information.
		Announcement bit for a leap second: ----------------------------------- The DCF77 control unit is currently being modified so that in future an announcement bit for a leap second can be sent.
		It is expected that for the first time on 1st July 1985 the second mark No. 19 will be extended to a length of 0.2s for one hour prior to the introduction of a leap second.
	www.electronic-engineering.ch /microchip/datasheets/dcf77/dcf77.html (1164 words)

	Synchronizing time with DCF77 and MSF60
		In general, DCF77 receivers with an internal clock (to bridge periods of no reception or bad reception) operate adequately in a range up to 1500 km.
		It is advised to mount the antenna out-door.
		A script that uses the DCF77 module and prints the date and time to an LCD is also included in the archive.
	www.compuphase.com /mp3/h0420_timecode.htm (2222 words)

	Construction Projects \| July/August 2003 \| Seconds and Minutes Clocks from DCF77 (Site not responding. Last check: )
		Nowadays, the availability of inexpensive receiver components makes it attractive to use the DCF77 signal at 77.5 kHz (transmitted from Mainflingen, Germany) for trivial applications.
		As is well known, the 59th second pulse is missing every minute in the DCF77 signal, with the missing pulse marking the minute.
		To obtain an uninterrupted seconds clock, we must first generate minutes pulses from these gaps and then derive the missing seconds pulses from the minutes clock.
	www.elektor-electronics.co.uk /Default.aspx?TabId=28&year=2003&month=7&art=50403&PN=On (101 words)

	DjB's Homepage
		Let er op dat de DCF77 module (ontvanger) niet dicht bij een draaiende computer in de buurt staat want dat stoort op de ontvangst.
		Ook een lichtdimmer in huis kan flink op de DCF77 ontvangst storen.
		Een pull-up van het dcf signaal is niet nodig, omdat er bij de 16F628 een interne pull-up aanwezig is die we gebruiken.
	users.pandora.be /djbert/dcfklok.htm (622 words)

	project1: dcf77
		The radio clock signal DCF77 is broadcasted from long wave transmitter located in a village called Mainflingen near Frankfurt (which is only a few kilometers from where I'm living) and can be received within a radius of about 2000km.
		BTW: the name DCF77 is composed from 'D' for Germany ('Deutschland' in German), 'C' as identifier for a long-wave trasmitter, 'F' for Frankfurt and the 77 for the carrier wave frequency (77,5kHz).
		I used the DCF77 module from Conrad (BN 641138-66/ 19,95 DM) as DCF77 receiver.
	home.arcor.de /0xdeadbeef/dcf77_e.htm (1089 words)

	Digitizers
		The quartz is digitally trimmed at normal environemental temperature (20-25 Celsius degrees) this allows to have at maximum one second of error per week.
		The DCF77 time can be automatically adjusted to local time using the proper time lag correction.
		The quartz is digitally trimmed at normal environement temperature (20-25 Celsius degrees) this allow to have at maximum one second of error per week.
	mariottim.interfree.it /doc04_e.htm (1267 words)

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