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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==
In accordance with ''ITU Radio Regulations'' (article 1) variations of this ''radiocommunication service'' are classified as follows:<br />
'''Standard frequency and time signal service''' (article 1.53)<br />
* [[Standard frequency and time signal-satellite service]]
 
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==
Line 28 ⟶ 34:
| [[International Telecommunication Union region|Region 1]] || Region 2 || Region 3
|-
|colspan="3"|19.95-2095–20.05 [[kHz|MHz]] &nbsp;&nbsp; &nbsp; &nbsp; '''STANDARD FREQUENCY AND TIME SIGNAL (20 kHz&nbsp;MHz)'''
|-
|colspan="3"|2 498-2 501 kHz&nbsp;MHz &nbsp;&nbsp; &nbsp; &nbsp; STANDARD FREQUENCY AND TIME SIGNAL (2 500 kHz&nbsp;MHz)
|-
|colspan="3"|4 995-5995–5 003 kHz&nbsp;MHz &nbsp;&nbsp; &nbsp; &nbsp; STANDARD FREQUENCY AND TIME SIGNAL (5 000 kHz&nbsp;MHz)
|-
|colspan="3"|5 003-5003–5 005 kHz&nbsp;MHz &nbsp;&nbsp; &nbsp; &nbsp; STANDARD FREQUENCY AND TIME SIGNAL<br />
:::::: Space research
|-
|colspan="3"|9 995-10995–10 003 kHz&nbsp;MHz &nbsp;&nbsp; &nbsp; STANDARD FREQUENCY AND TIME SIGNAL (10 000 kHz&nbsp;MHz)
|-
|colspan="3"|10 003-10003–10 005 kHz&nbsp;MHz &nbsp;&nbsp; STANDARD FREQUENCY AND TIME SIGNAL<br />
:::::: Space research
|-
|colspan="3"|14 990-15990–15 005 kHz&nbsp;MHz &nbsp;&nbsp; STANDARD FREQUENCY AND TIME SIGNAL (15 000 kHz&nbsp;MHz)
|-
|colspan="3"|15 005-15005–15 010 kHz&nbsp;MHz &nbsp;&nbsp; STANDARD FREQUENCY AND TIME SIGNAL<br />
:::::: Space research
|-
|colspan="3"|19 990-19990–19 995 kHz&nbsp;MHz &nbsp;&nbsp; STANDARD FREQUENCY AND TIME SIGNAL<br />
:::::: Space research
|-
|colspan="3"|19 995-20995–20 010 kHz&nbsp;MHz &nbsp;&nbsp; STANDARD FREQUENCY AND TIME SIGNAL (20 000 kHz&nbsp;MHz)
|-
|colspan="3"|24 990-25990–25 005 kHz&nbsp;MHz &nbsp;&nbsp; STANDARD FREQUENCY AND TIME SIGNAL (25 000 kHz&nbsp;MHz)
|-
|colspan="3"|25 005-25005–25 010 kHz&nbsp;MHz &nbsp;&nbsp; STANDARD FREQUENCY AND TIME SIGNAL<br />
:::::: Space research
|-
Line 60 ⟶ 66:
 
== Time signals in use ==
The following are the known [[High frequency|HF]] time signal stations currently operational.
 
=== 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>ITU Radio Regulations, Section IV. Radio Stations and Systems – Article 1.53, definition: ''standard frequency and time signal service''</ref>▼
{| class="wikitable"
|+
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!Time Signal Format
!Notes
|-▼
| colspan="6" |'''ITU-R Standard Frequency and Time Signal services'''
|-
|[[BPM (time service)|BPM]]
|Pucheng, China
|2.5, 5, 10, & 15 &nbsp;MHz
|
|
|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=|access-datestatus=dead}}</ref>
|-
|BSF
|Chung-Li, Taiwan, Rep. of China
|5 and 15 &nbsp;MHz
|▼
|▼
|▼
▲|-
|[[CHU (radio station)|CHU]]▼
|[[Ottawa, Ontario]], Canada▼
|14.67 MHz
|
|
Line 95 ⟶ 94:
|EBC
|[[Cádiz]]
|4.998 &nbsp;MHz
|
|
Line 102 ⟶ 101:
|[[HLA (radio station)|HLA]]
|Taejon, Republic of Korea
|5 &nbsp;MHz
|
|
Line 109 ⟶ 108:
|IAM
|Rome, Italy
|5 &nbsp;MHz
|
|
Line 116 ⟶ 115:
|LOL
|Buenos Aires, Argentina
|5, 10, & 15 &nbsp;MHz
|
|
Line 123 ⟶ 122:
|MIKES
|[[Espoo, Finland]]
|25 &nbsp;MHz
|
|
Line 130 ⟶ 129:
|[[OMA (time signal)|OMA]]
|Prague, Czech Republic
|2.5 &nbsp;MHz
|
|
Line 137 ⟶ 136:
|PPE
|[[Rio de Janeiro]], Brazil
|10 &nbsp;MHz
|
|
Line 144 ⟶ 143:
|[[RWM]]
|Moscow, Russia
|4.99z996, 9.996, 14.996 &nbsp;MHz
|
|
Line 151 ⟶ 150:
|[[WWV (radio station)|WWV]]
|Fort Collins, Colorado, United States
|2.5, 5, 10, 15, & 20 &nbsp;MHz
|
|
Line 158 ⟶ 157:
|[[WWVH]]
|Kekaha, Kauai, Hawaii, United States
|2.5, 5, 10, & 15 &nbsp;MHz
|
|
Line 165 ⟶ 164:
|[[YVTO]]
|Caracas, [[Venezuela]]
|5 &nbsp;MHz
▲|
▲|
▲|
|-
| colspan="6" |'''Time signal stations on non-standard frequencies'''
|-
▲|[[CHU (radio station)|CHU]]
▲|[[Ottawa, Ontario]], Canada
|3.33, 7.85, 14.67&nbsp;MHz
|
|
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|}
 
=== ExternalUnited linksStates ===
▲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>ITU Radio Regulations, Section IV. Radio Stations and Systems – Article 1.53, definition: ''standard frequency and time signal service''<name="ReferenceA"/ref>
* [http://tf.nist.gov/ NIST Time and Frequency Division]▼
 
* [http://www.nplindia.org/time-and-frequency-standards NPL India Time and Frequency Standards]▼
== See also ==
* [http://www.itu.int International Telecommunication Union (ITU)]
* [[Time synchronization in North America]]
* [[Radio Clock]]
* [[Time_signal#Radio_time_sources]]
 
==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}}
 
[[Category:Radiocommunication services ITU]]
[[Category:Standards]]
Retrieved from "https://en.wikipedia.org/wiki/Standard_frequency_and_time_signal_service"