Standard frequency and time signal service: Difference between revisions

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{{Short description|Radiocommunication service for scientific and other purposes}}

[[File:Dcf77.jpg|thumb|250px|<center> Standard frequency and time signal radio station [[DCF77]]]]

See also: {{main|Radio station|Radiocommunication service}}

[[File:YVTO time.ogg|thumb|<center> Radiocommunication signal of the time signal transmitter station [[YVTO]]]]

[[File:Dcf77.jpg|thumb|250px300px|<{{center> |Standard frequency and time signal radio station [[DCF77]]}}]]

[[File:YVTO time.ogg|thumb|<{{center> |Radiocommunication signal of the time signal transmitter station [[YVTO]]}}]]

'''Standard frequency and time signal service''' (short: '''SFTS''') is –, according to ''Article 1.53'' of the [[International Telecommunication Union|International Telecommunication Union´'s]] (ITU) [[ITU Radio Regulations|Radio Regulations]] (RR),<ref name="ReferenceA">ITU Radio Regulations, Section IV. Radio Stations and Systems – Article 1.53, definition: ''standard frequency and time signal service''</ref> – defined as ''«"A radiocommunication service for scientific, technical and other purposes, providing the transmission of specified frequencies, time signals, or both, of stated high precision, intended for general reception''".»

See also: {{main|Radio station|Radiocommunication service}}

==Classification==

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In general this ''radiocommunication service '' uses radio stations as follows:

*[[Standard frequency and time signal station]]sstations (article 1.95)

==Standard frequency and time signal-satellite service==

[[File:Dezhurov GTS-21.jpg|thumb|250px|{{center|GTS-Module onboard ISS, handled by [[astronaut]] [[Vladimir Dezhurov]]}}]]

''' Standard frequency and time signal-satellite service ''' (short: '''SFTSS''') is, according to ''Article 1.54'' of the [[International Telecommunication Union|International Telecommunication Union's]] (ITU) [[ITU Radio Regulations|Radio Regulations]] (RR),<ref>ITU Radio Regulations, Section IV. Radio Stations and Systems – Article 1.54, definition: ''standard frequency and time signal-satellite service''</ref> defined as ''A radiocommunication service using [[space radio station|space stations]] on earth [[satellite]]s for the same purposes as those of the standard frequency and time signal service''.

An example to this were experiments of time synchronisation (Global Transmission Services GTS-2) onboard International Space Station. However, in accordance to the ubiquitous availability, GNSS-satellite signals will be used in practice (see also: [[GPS disciplined oscillator]]).

==Frequency allocation==

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|ITU-R TF.768-5<ref name=":0">{{Cite web|url=https://www.itu.int/dms_pubrec/itu-r/rec/tf/R-REC-TF.768-5-200202-S!!PDF-E.pdf|title=RECOMMENDATION ITU-R TF.768-5 Standard frequencies and time signals|last=|first=|date=|website=|archive-url=https://web.archive.org/web/20171222053729/https://www.itu.int/dms_pubrec/itu-r/rec/tf/R-REC-TF.768-5-200202-S!!PDF-E.pdf|archive-date=2017-12-22|dead-url=yes|access-datestatus=dead}}</ref>

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|BSF

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|[[RWM]]

|Moscow, Russia

|4.99z996, 9.996, 14.996&nbsp;MHz

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=== United States ===

The '''Standard Time and Frequency Signal''' (STFS) is a [[Radiocommunication service]] providing the transmission of specified [[frequency]] and [[time]] signal, of [[Standardization|stated]] high precision, intended for general reception in the United States and beyond. The radio signals are broadcast on very precise [[Carrier signal|carrier]] frequencies by the [[United States Naval Observatory|U.S. Naval Observatory]] and the [[National Institute of Standards and Technology]] (NIST), formerly the National Bureau of Standards (NBS). The technical specification of that particular service is in line to the provisions of the [[International Telecommunication Union|International Telecommunication Union´'s]] (ITU) [[ITU Radio Regulations|Radio Regulations]] (RR)<ref name="ReferenceA"/>

== See also ==

* [[Time synchronization in North America]]

* [[Radio Clock]]

* [[Time_signal#Radio_time_sources]]

== External links ==

* [https://web.archive.org/web/20060421225303/http://tf.nist.gov/ NIST Time and Frequency Division]

* [http://www.nplindia.org/time-and-frequency-standards NPL India Time and Frequency Standards]

* [http://www.itu.int International Telecommunication Union (ITU)]

==References ==

{{reflist}}

== External links ==

* [https://web.archive.org/web/20060421225303/http://tf.nist.gov/ NIST Time and Frequency Division]

* [http://www.nplindia.org/time-and-frequency-standards NPL India Time and Frequency Standards]'''Bad Link'''

{{Radiocommunication services ITU}}