Time Signal Transmitter

List of Time Signal Transmitters

The table below shows the most globally known time signal transmitters, which transmit a time signal in the respective region, which is used among other things for the synchronization of radio-controlled clocks - for example DCF77 for Germany and Central Europe.

Name	Frequency	Location	Description	Website	Status
ATA	10 MHz	Greater Kailash, New Delhi, India at N28°32'45.334" E77°14'14.867"	ATA is a time signal transmitter used in Greater Kailash, New Delhi, India at 28th at 34'N 77° 19'E. The frequency of 10 MHz is being sent continuously. Technical Specifications: Second pulses of 5 cycles of a 1 kHz modulation. Minute pulses of 100 ms duration. The time signals are advanced by 50 ms on UTC.	NPL India	suspended since 2000
BPM	2.5, 5.0, 10.0, and 15.0 MHz	Pucheng County, Shaanxi, China at 34°56'55.96?N 109°32'34.93?	BPM is a time signal transmitter used in Pucheng, China. The spectrum of frequencies reaches from 2.5, 5 over 10 and 15 MHz, which are being sent (UTC scheduled) 7h30m to 1 o’clock, continuously (for 5 and 10 MHz) and from 1h to 9h. Technical Specifications: Signals emitted in advance on UTC by 20 ms. Second pulses of 10 ms duration with 1 kHz modulation. Minute pulses of 300 ms duration with 1 kHz modulation. UTC time signals are emitted from minute 0 to 10, 15 to 25, 30 to 40, 45 to 55. UT1 time signals are emitted from minute 25 to 29, 55 to 59.	BPM Website	alive
BSF	5 and 15 MHz	Chung-Li, Taiwan, Rep. of China at 24° 57’ N, 121° 09’ E	BSF is a time signal transmitter based in Chung-Li Taiwan Rep. of China at 24° 57'N 121° 09'E. It has two frequencies in use: 5 and 15 MHz in use. The latter runs (unlike the first one) with an interruption between the minutes 35 and 40. Technical Specifications: From minutes 5 to 10, 15 to 20, 25 to 30, 45 to 50, 55 to 60, second pulses of 5 ms duration without 1 kHz modulation. From minute 0 to 5, 10 to 15, ..., 50 to 55, second pulses of 5 ms duration with 1 kHz modulation. The 1 kHz modulation is interrupted 40 ms before and after the pulses. Minute pulses are extended to 300 ms duration. DUT1: ITU-R code by pulse lengthening.	BSF Website	alive
CHU	3330 kHz, 7850 kHz, 14670 kHz	Ottawa, Ontario, Canada at 45° 18'N 75° 45'W	CHU is a time signal transmitter used in Ottawa, Canada at 45° 18'N 75° 45'W. It is based on three different frequencies: 3330, 7850 and 14670 kHz which are all running continuously. Technical Specifications: Second pulses of 300 cycles of a 1 kHz modulation, with 29th and 51st to 59th pulses of each minute omitted. Minute pulses are 0.5 s long. Hour pulses are 1.0 s long, with the following 1st to 10th pulses omitted. A bilingual (Fr. Eng.) announcement of time (UTC) is made each minute following the 50th second pulse. FSK code (300 bps, Bell 103) after 10 cycles of 1 kHz on seconds 31 to 39. Year, DUT1, leap second information, TAI-UTC and Canadian summer time format on 31, and time code on 32-39. Broadcast is single sideband; upper sideband with carrier reinsert. DUT1 : ITU-R code by double pulse.	Time Services of Institute for National Measurement Standards	alive
DCF77	77.5 kHz	Mainflingen near Frankfurt am Main, 50°01' N, 09° 00' O)	DCF77 is a longwave time signal broadcast station at Mainflingen, Germany, about 25 km south-east of Frankfurt. The DCF77 radio signals are derived from an atomic clock, and broadcasted on 77.5 kHz. The signal can be received up to a distance of 2000 km and more. The transmitter is controlled by the Physikalisch-Technische Bundesanstalt (PTB) in Brauschweig, Germany. More specific information can be found at DCF77 info.	PTB - Dissemination of legal time - DCF77	ok
EBC	6840 kHz	San Fernando, Cádiz, Spain, 36° 28'N 6° 12'W	EBC is a time signal transmitter based in San Fernando, Spain at 36° 28'N 6° 12'W. The frequency of 15,006 MHz runs from 10h to 10h25m and the frequency of 4998 run from 10h30m to 10h55m. Exceptions are Saturdays, Sundays and national holidays. Technical Specifications: Second pulses of 0.1 s duration of a 1 kHz modulation. Minute pulses of 0.5 s duration of 1 250 Hz modulation. DUT1: ITU-R code by double pulse.	n.a.	alive
HBG	75 kHz	Prangins, Switzerland,46° 24'N 6° 15'E	HBG is a time signal transmitter and finds its origin in Prangins, Switzerland at 46° 24'N 6° 15'E and continuously sends with a frequency of 75 kHz. Note: As the use of the HBG time signal was too low for continued operation and an extensive renovation of the transmitter is unavoidable, the Swiss Federal Council decided in 2009 to discontinue the operation of the transmitter at the end of 2011.	Metas Website	suspended
HLA	5 MHz	Taedok, Science Town, Rep. of Korea, 36° 23'N 127° 22'E	HLA is a time signal transmitter and is in use in Taedok, Science Town, Rep. of Korea at 36° 23'N 127° 22'E and continuously sends with a frequency of 5 MHz. Technical Specifications: Pulses of 9 cycles of 1 800 Hz modulation. 29th and 59th second pulses omitted. Hour identified by 0.8 s long 1 500 Hz tone. Beginning of each minute identified by a 0.8 s long 1 800 Hz tone. Voice announcement of hours and minutes each minute following the 52nd second pulse. BCD time code given on 100 Hz sub carrier. DUT1: ITU-R code by double pulse.	Time and Frequency LaboratoryKorea Research Institute of Standards & Science	alive
IAM	5 MHz	Roma, Italy, 41° 47'N 12° 27'E	IAM is a time signal transmitter based in Roma, Italy at 41° 47'N 12° 27'E. It uses a frequency of 5 MHz and is being send from 7h30 to 8h30 and from 10h30m to 11h30m except on Sundays and national holidays. Advanced by 1 hour in summer. Technical Specifications: Second pulses of 5 cycles of 1 kHz modulation. Minute pulses of 20 cycles. Voice announcements every 15 minutes beginning at 0 h 0 m. DUT1: ITU-R code by double pulse.	No website	alive
JJY	40 kHz	Miyakoji, Fukushima, Japan at 37° 22'N 140° 51'E	JJY is a time signal transmitter based in Miyakoji, Fukushima, Japan at 37° 22'N 140° 51'E and continuously sends with a frequency of 40 kHz. Technical Specifications: A1B type 0.2 s, 0.5 s and 0.8 s second pulses, spacing are given by the reduction of the amplitude of the carrier. Coded announcement of hour, minute, day of the year, year, day of the week and leap second. Transmitted time refers to UTC(CRL) + 9 h.	Japan Standard Time Website	alive - again
JJY-60	60 kHz	Fukuoka Prefecture, Japan at 33?27'56"N 130?10'32"E	Hagane-yama LF Standard Time and Frequency Transmission Station (NICT) Antenna Power: 50kW(antenna efficiency: approx.45%) Radio Wave Mode: A1B Carrier frequency: 60kHz	Japan Standard Time Website	alive
LOL	5, 10 and 15 MHz	Buenos Aires, Argentina at 34° 37'S 58° 21'W	LOL is a time signal transmitter based in Buenos Aires, Argentina at 34° 37'S 58° 21'W. It uses a range of frequencies of 5, 10 and 15 MHz, whereas the last two are being sent irregularly. The signals are being sent one hour at a time with a three hour break starting at 11 o’clock. Technical Specifications: Second pulses of 5 cycles of 1000 Hz modulation. Second 59 is omitted. Announcement of hours and minutes every 5 minutes, followed by 3 minutes of 1000 Hz or 440 Hz modulation. DUT1: ITU-R Code by lengthening.	Hora Oficial por Radiotelefonía	alive
MSF	60 kHz	Anthorn, United Kingdom at 52° 22'N 1° 11'W	MSF is a time signal transmitter based in Anthorn, United Kingdom at 52° 22'N 1° 11'W and continuously sends with a frequency of 60 kHz, except during maintenance interruptions from 10 h 0 m to 14 h 0 m on the first Tuesday of January, April, July and October. A longer period of maintenance during the summer is announced annually. Technical Specifications: Interruptions of the carrier of 100 ms for the second pulses and of 500 ms for the minute pulses. The signal is given by the beginning of the interruption. BCD NRZ code, 1 bit/s (year, month, day of the month, day of the week, hour, minute) from second 17 to 59 in each minute, following the seconds interruption. DUT1: ITU-R code by double pulse.	NPL Website	alive
RAB-99	25 kHz	Khabarovsk, Russia at 48° 30'N 134° 50'E	RAB-99 is a time signal transmitter used in Khabarovsk Russia at 48° 30'N 134° 50'E. It is sent with a frequency of 25 kHz and has a certain winter-: 02 h 06 m to 02 h 20 m, 06 h 06 m to 06 h 20 m, and summer schedule: 01 h 06 m to 01 h 20 m, 05 h 06 m to 05 h 20 m. Technical Specifications: A1N type signals are transmitted between 9 and 20: 0.025 second pulses of 12.5 ms duration are transmitted between minutes 9 and 11 ; 0.1 second pulses of 25 ms duration, 10 second pulses of 1 s duration, 0.1 second pulses of 25 ms duration and minute pulses of 10 s duration are transmitted between minutes 11 and 20.	n.a.	alive
RBU	66,6 kHz	Moscow, Russia at 55° 44'N 38° 12'E	RBU is a time signal transmitter used in Moscow, Russia at 55° 44'N 38° 12'E. It is sent continuously with a frequency of 66,6 kHz. Technical Specifications: DXXXW type 0.1 s signals. The numbers of the minute, hour, day of the month, day of the week, month, year of the century, difference between the universal time and the local time, TJD and DUT1+dUT1 are transmitted each minute from the 1st to the 59th second. DUT1+dUT1 : by double pulse.	n.a.	alive
RJH-63	25 kHz	Krasnodar, Russia, at 44° 46'N 39° 34'E	RJH-63 is a time signal transmitter used in Krasnodar, Russia, at 44° 46'N 39° 34'E. It sends with a frequency of 25 kHz just like the RBU with a certain Winter schedule: 11 h 06 m to 11 h 20 m and Summer schedule: 10 h 06 m to 10 h 20 m. Technical Specifications:A1N type signals are transmitted between minutes 9 and 20 : 0.025 second pulses of 12.5 ms duration are transmitted between minutes 9 and 11 ; 0.1 second pulses of 25 ms duration, 10 second pulses of 1 s duration and minute pulses of 10 s duration are transmitted between minutes 11 and 20.	n.a.	alive
RJH-69	25 kHz	Molodechno, Belarus at 54° 28'N 26° 47'E	RJH-69 is a time signal transmitter used in Molodechno, Belarus at 54° 28'N 26° 47'E. It sends with a frequency of 25 kHz to the following schedules: Winter schedule 07 h 06 m to 07 h 22 m and Summer schedule 06 h 06 m to 6 h 22 m. Technical Specifications:A1N type signals are transmitted between minutes 10 and 22 : 0.025 second pulses of 12.5 ms duration are transmitted between minutes 10 and 13; second pulses of 0.1 s duration, 10 second pulses of 1 s duration, 0.1 second pulses of 25 ms and minute pulses of 10 s duration are transmitted between minutes 13 and 22.	n.a.	alive
RJH-77	25 kHz	Arkhangelsk, Russia at 64° 22'N 41° 35'E	RJH-77 is a time signal transmitter used in Arkhangelsk, Russia at 64° 22'N 41° 35'E. It sends with a frequency of 25 kHz on Winter schedule 09 h 06 m to 09 h 22 m and Summer schedule 08 h 06 m to 08 h 22 m. Technical Specifications: A1N type signals are transmitted between minutes 10 and 22: 0.025 second pulses of 12.5 ms duration are transmitted between minutes 10 and 13; second pulses of 0.1 s duration, 10 second pulses of 1 s duration, 0.1 second pulses of 25 ms and minute pulses of 10 s duration are transmitted between minutes 13 and 22.	n.a	alive
RJH-86	25 kHz	Bishkek, Kirgizstan, at 43° 03'N 73° 37'E	RJH-86 is a time signal transmitter used in Bishkek, Kirgizstan, at 43° 03'N 73° 37'E. It sends with a constant frequency of 25 kHz on Winter schedule 04 h 06 m to 04 h 22 m 10 h 06 m to 10 h 22 m and Summer schedule 03 h 06 m to 03 h 22 m, 09 h 06 m to 09 h 22 m. Technical Specifications:A1N type signals are transmitted between minutes 10 and 22 : 0.025 second pulses of 12.5 ms duration are transmitted between minutes 10 and 13; second pulses of 0.1 s duration, 10 second pulses of 1 s duration, 0.1 second pulses of 25 ms and minute pulses of 10 s duration are transmitted between minutes 13 and 22.	n.a.	alive
RJH-90	25 kHz	Nizhni, Novgorod, Russia at 56° 11'N 43° 57'E	RJH-90 is a time signal transmitter used in Nizhni, Novgorod, Russia at 56° 11'N 43° 57'E. It sends with a frequency of 25 kHz due to Winter schedule 05 h 06 m to 05 h 22 m and Summer schedule 04 h 06 m to 04 h 22 m. Technical Specifications: A1N type signals are transmitted between minutes 10 and 22 : 0.025 second pulses of 12.5 ms duration are transmitted between minutes 10 and 13; second pulses of 0.1 s duration, 10 second pulses of 1 s duration, 0.1 second pulses of 25 ms and minute pulses of 10 s duration are transmitted between minutes 13 and 22.	n.a.	alive
RTZ	50 kHz	Irkutsk, Russia at 52° 26'N 103° 41'E	RTZ is a time signal transmitter used in Irkutsk, Russia at 52° 26'N 103° 41'E. It sends with a constant frequency of 50 kHz due to Winter schedule 22 h 00 m to 24 h 00 m 00 h 00 m to 21 h 00 m and Summer schedule 21 h 00 m to 24 h 00 m, 00 h 00 m to 20 h 00 m. Technical Specifications: A1X type second pulses of 0.1 s duration are transmitted between minutes 0 and 5. The pulses at the beginning of a minute are prolonged to 0.5 s. A1N type 0.1 second pulses of 0.02 s duration are transmitted at 59th minute. The pulses at the beginning of the second are prolonged to 40 ms and of the minute to 0.5 s. DUT1+dUT1: by double pulse.	n.a.	alive
RWM	4,996 MHz, 9,996 MHz, 14,996 MHz	Moscow, Russia at 55° 44'N 38° 12'E	RWM is a time signal transmitter used in Moscow, Russia at 55° 44'N 38° 12'E. The station operates simultaneously on the three frequencies: 4,996, 9,996, 14,996 MHz. Technical Specifications: A1X type second pulses of 0.1 s duration are transmitted between minutes 10 and 20, 40 and 50. The pulses at the beginning of the minute are prolonged to 0.5 s. A1N type 0.1 s second pulses of 0.02 s duration are transmitted between minutes 20 and 30. The pulses at the beginning of the second are prolonged to 40 ms and of the minute to 0.5 ms. DUT1+dUT1: by double pulse.	n.a.	alive
TDF	162 kHz	Allouis, France at 47° 10'N 2° 12'E	TDF is a time signal transmitter used in Allouis, France at 47° 10'N 2° 12'E. It sends continuously, except every Tuesday from 1 h to 5 h, with a frequency of 162 kHz. Technical Specifications: Phase modulation of the carrier by +1 and -1 rd in 0.1 s every second except the 59th second of each minute. This modulation has to be indicated double through binary 1. The numbers of the minute, hour, day of the month, day of the week, month and year are transmitted each minute from the 21st to the 58th second, in accordance with the French legal time scale. In addition, a binary 1 at the 17th second indicates that the local time is 2 hours ahead of UTC (summer time); a binary 1 at the 18th second indicates that the local time is 1 hour ahead of UTC (winter time); a binary 1 at the 14th second indicates that the current day is a public holiday (Christmas, 14 July, etc...); a binary 1 at the 13th second indicates that the current day is a day before a public holiday.	SYRTE website	alive
VNG	2,5 MHz, 5 MHz, 8,638 MHz, 12,984 MHz	Llandilo, New South Wales, Australia at 33° 43'S 150° 48'E	VNG is a time signal transmitter used in Llandilo, New South Wales, Australia at 33° 43'S 150° 48'E. It sends continuously with the frequencies: 2,5, 5, 8,638, 12,984 MHz. The frequency of 16 MHz is only used from 22h to 10h. Technical Specifications: Second pulses of 50 ms of a 1 kHz modulation. Second pulses from 55 to 58 of 5 ms of a 1 kHz modulation. Second pulse at 59 is omitted. Minute pulses of 0.5 s of a 1 kHz modulation. During the minutes 5, 10, 15, ..., second pulses from 50 to 58 are 5 ms long with a 1 kHz modulation. The BCD time code giving day of the year, hour and minute at the next minute is activated between seconds 20 and 46. Voice announcement on 2 500, 5 000 and 16 000 kHz during minutes 15, 30, 45 and 60. Morse station identification on 8 638 and 12 984 kHz during minutes 15, 30, 45 and 60. DUT1: ITU-R Code by double pulse.	VNG PDF	suspended
WWVH	2,5 MHz, 5 MHz, 10 MHz, 15 MHz	Kauai, Hawai, USA at 21° 59'N 159° 46'W	WWVH is a time signal transmitter sending from Kauai, Hawai, USA at 21° 59'N 159° 46'W. It continuously sends frequencies of 2,5, 5, 10, 15 MHz. Technical Specifications: Pulses of 6 cycles of 1 200 Hz modulation. The pulses at the 29th and 59th second are omitted. An hour is identified by a 0.8 second long and 1 500 Hz high tone. The beginning of each minute is identified by a 0.8 second long and 1 200 Hz high tone. DUT1: ITU-R code by double pulse. BCD time code given on 100 Hz subcarrier includes DUT1 correction.	WWVH Website at NIST	alive
WWVB	60 kHz	Fort Collins, Colorado, USA 40° 41’ N, 105° 02’ W	WWVB is a NIST time signal radio station co-located with WWV in Fort Collins, Colorado. Radio clocks in North America can use WWVB to synchronize their time. WWVB transmitts a continuous 60 kHz carrier wave, derived from a set of atomic clocks located at the transmitter site. A 1 bit-per-second time code is pulse-width modulated onto the carrier wave.	WWVB Website at NIST	alive
WWV	2.5 MHz, 5 MHz, 10 MHz, 15 MHz and 20 MHz	Fort Collins, Colorado, USA at 40° 41’ N, 105° 02’ W	WWV is the callsign of NIST's shortwave radio station in Fort Collins, Colorado. WWV disseminates the official U.S. Government time signals. The transmitter broadcasts on five frequencies: 2.5 MHz, 5 MHz, 10 MHz, 15 MHz and 20 MHz. The carrier frequencies and the time signals are derived from a set of atomic clocks at the transmitter site. WWV is a partner of the WWVH radio station, located in Hawaii, and of the WWVB longwave radio station which is also located in Fort Collins, Colorado.	WWV Website at NIST	alive
YVTO	5 MHz	Caracas, Venezuela at 10° 30'N 66° 56'W	YVTO is a time signal transmitter used in Caracas, Venezuela at 10° 30'N 66° 56'W. It continuously sends with a frequency of 5 MHz. Technical Specifications: Second pulses of a 1 kHz modulation with a duration of 0.1 s. A minute is identified by a 0.5 s long and 800 Hz high tone. The 30th second is omitted. Between seconds 40 and 50 of each minute, a station identification is done through a voice annoucement. Between seconds 52 and 57 of each minute, voice announcements of hour, minute and second are send.	QSL Entry of YVTO	alive

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DCF77 radio clock with serial RS232 interface

Time Signal Transmitter

List of Time Signal Transmitters

ATA

BPM

BSF

CHU

DCF77

EBC

HBG

HLA

IAM

JJY

JJY-60

LOL

MSF

RAB-99

RBU

RJH-63

RJH-69

RJH-77

RJH-86

RJH-90

RTZ

RWM

TDF

VNG

WWVH

WWVB

WWV

YVTO

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