ALS162 time signal (original) (raw)
ALS162 is a French longwave time signal and standard-frequency radio station and is used for the dissemination of the Metropolitan French national legal time to the public. TéléDiffusion de France broadcast the ALS162 time signal, provided by LNE-SYRTE and LNE-LTFB time laboratories under ANFR (state body for radio frequencies) responsibility, from the Allouis longwave transmitter at 162 kHz, with a power of 800 kW. The signal transmission is almost continuous, but there is a regularly scheduled interruption for maintenance and tests every Tuesday morning from 08:00 to 12:00.
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| dbo:abstract | ALS162 is a French longwave time signal and standard-frequency radio station and is used for the dissemination of the Metropolitan French national legal time to the public. TéléDiffusion de France broadcast the ALS162 time signal, provided by LNE-SYRTE and LNE-LTFB time laboratories under ANFR (state body for radio frequencies) responsibility, from the Allouis longwave transmitter at 162 kHz, with a power of 800 kW. The current time signal is generated by extremely accurate caesium atomic clocks and phase-modulated on the 162 kHz (1850.5707284 m wavelength) carrier signal in a way that is inaudible when listening to the signal using normal Longwave receivers. The ALS162 phase-modulated time signal service requires a more complex receiver than the popular German DCF77 amplitude-modulated time signal service, but the much more powerful transmitter (16 times DCF77's 50 kW) gives it a much greater range of 3,500 km. The signal transmission is almost continuous, but there is a regularly scheduled interruption for maintenance and tests every Tuesday morning from 08:00 to 12:00. The transmitter building contains two caesium atomic clocks which are used to generate the time signal and which are monitored through the SYREF system and GPS common-view measurements, to align with the official French UTC(OP) time scale. The ALS162 time signal exactitude should be in excess of 1 millisecond uncertainty. The monitoring of the ALS162 signal is jointly conducted by LNE-SYRTE, LNE-LTFB and the trade body France Horlogerie and measurement results are published in real time. Monthly monitoring bulletins, like H 649 of the ALS162 signal regarding January 2022 measurements, show if the exactitude goals were met. The time signal is critical for over 300,000 devices (clocks in public places, information panels, traffic lights, public lighting, parking meters, etc.) deployed within French enterprises and state entities, such as French Railways (SNCF), electricity distributor Enedis, airports, hospitals, municipalities, etc. which depend on the signal in France and abroad. (en) Télé Diffusion de France, eller TDF, är en tidssignalsservice, som sänds på långvågsradio från franska "Laboratoire primaire du temps et des frequences" (LPTF). Tidssignalen skapas av en extremt exakt cesiumfontäns atomur. Tidssignalen sänds från Allouis, i Frankrike vid "Centre National d'Etudes des Télécommunications" med en effekt av 2 MW på frekvensen 162 kHz. Signalen är fasmodulerad med en bärvågsfrekvens på 162 kHz vilket inte är hörbart för radiomottagare baserad på amplitudmodulering (AM) som lyssnar på den vanliga "France Inter" signalen. Denna signal kräver en mer komplicerad mottagare än den populära DCF77 tjänsten, men sändaren är också mycket mer kraftfull med sin effekt på 2000 kW jämfört med 50 kW för DCF77 vilket ger mycket större räckvidd. Signalen är kontinuerlig frånsett schemalagda avbrott för underhåll mellan UTC 01:00 och 05:00 varje tisdag. (sv) |
| dbo:thumbnail | wiki-commons:Special:FilePath/Emetteur-allouis3.jpg?width=300 |
| dbo:wikiPageExternalLink | http://www.datelec.fr/signaux_horaires/p0.htm http://www.eecis.udel.edu/~mills/ntp/tdf.html http://www.leunig.de/_pro/netzwerk/funkuhr/funkuhren_DCF77_TDF.htm http://www.longwave.de/TSS.pdf http://www.pa3fwm.nl/signals/clock-lille-flandres/ https://web.archive.org/web/20060818020829/http:/www.longwave.de/TSS.pdf http://pagesperso-orange.fr/tvignaud/am/allouis/allouis-heure.htm |
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| dbo:wikiPageRevisionID | 1113062675 (xsd:integer) |
| dbo:wikiPageWikiLink | dbr:Carrier_signal dbr:Amplitude_modulation dbr:Quartz_clock dbr:Paris_Observatory dbr:Daylight_saving_time dbr:Allouis_longwave_transmitter dbr:Phase_modulation dbr:SNCF dbr:Geneva_Frequency_Plan_of_1975 dbr:Frequency dbr:Loop_antenna dbr:Low_frequency dbr:Call_sign dbr:Électricité_de_France dbr:Hamming_weight dbr:Leap_second dbr:Allouis dbr:DCF77 dbr:Even_parity dbr:France_Inter dbr:Central_European_Summer_Time dbr:Central_European_Time dbr:Carrier_frequency dbr:File:TDF_phase_modulation_bit_pattern.svg dbr:Atomic_clock dbc:Time_signal_radio_stations dbr:TDF_Group dbr:Audio_signal dbr:Radian dbr:Radio_broadcasting dbr:Longwave dbr:Millisecond dbr:Time_signal dbr:Transmitter_station dbr:Cesium_standard dbr:TéléDiffusion_de_France dbr:File:Emetteur-allouis3.jpg |
| dbp:above | TDF ALS162 time code transmitter (en) |
| dbp:caption | 21000.0 (dbd:second) |
| dbp:data | July 1980 (en) 162.0 (dbd:kilohertz) 800.0 (dbd:kilowatt) Allouis longwave transmitter, Allouis, France (en) TéléDiffusion de France on behalf of the ANFR and LNE–SYRTE (en) |
| dbp:label | Frequency (en) Power (en) Website (en) Location (en) Elevation (en) Operator (en) Began operation (en) Ceased operation (en) Coordinates (en) Official range (en) |
| dbp:wikiPageUsesTemplate | dbt:Cite_web dbt:Convert dbt:Coord dbt:In_lang dbt:Infobox dbt:Reflist dbt:Short_description dbt:Time_measurement_and_standards dbt:Val dbt:Time_signal_authorities dbt:Time_signal_stations dbt:Time_topics |
| dct:subject | dbc:Time_signal_radio_stations |
| georss:point | 47.1695 2.2046 |
| rdf:type | geo:SpatialThing |
| rdfs:comment | ALS162 is a French longwave time signal and standard-frequency radio station and is used for the dissemination of the Metropolitan French national legal time to the public. TéléDiffusion de France broadcast the ALS162 time signal, provided by LNE-SYRTE and LNE-LTFB time laboratories under ANFR (state body for radio frequencies) responsibility, from the Allouis longwave transmitter at 162 kHz, with a power of 800 kW. The signal transmission is almost continuous, but there is a regularly scheduled interruption for maintenance and tests every Tuesday morning from 08:00 to 12:00. (en) Télé Diffusion de France, eller TDF, är en tidssignalsservice, som sänds på långvågsradio från franska "Laboratoire primaire du temps et des frequences" (LPTF). Tidssignalen skapas av en extremt exakt cesiumfontäns atomur. Tidssignalen sänds från Allouis, i Frankrike vid "Centre National d'Etudes des Télécommunications" med en effekt av 2 MW på frekvensen 162 kHz. Signalen är kontinuerlig frånsett schemalagda avbrott för underhåll mellan UTC 01:00 och 05:00 varje tisdag. (sv) |
| rdfs:label | ALS162 time signal (en) Télé Distribution Française (sv) |
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| geo:long | 2.204600 (xsd:float) |
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