HLA (radio station): Difference between revisions
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{{Short description|Time signal transmitter in South Korea}} |
{{Short description|Time signal transmitter in South Korea}} |
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{{Coord|36.38753|N|127.36650|E|region:KR-30_type:landmark_dim:100|display=title|name=HLA time signal antenna}} |
{{Coord|36.38753|N|127.36650|E|region:KR-30_type:landmark_dim:100|display=title|name=HLA time signal antenna}} |
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'''HLA''' is a [[time signal]] [[radio station]] in [[Daejeon]], [[South Korea]], operated by the [[Korea Research Institute of Standards and Science]]. Established on November 24, 1984, it transmits a 2 kW signal on 5 MHz (±0.01 Hz<ref name="timesignals"/>). Originally only transmitted for 7 hours per day (01:00–08:00), 5 days per week (M–F),<ref>{{Citation |url=http://www.itu.int/dms_pub/itu-r/oth/0A/08/R0A080000070001MSWE.doc |author=International Telecommunication Union |date=6 October 2010 |title=Characteristics of standard-frequency and time-signal emissions in allocated bands and characteristics of stations emitting with regular schedules with stabilized frequencies, outside of allocated bands |accessdate=2011-08-25}} Supplement to Recommendation ITU-R TF.768 “Standard frequencies and time signals”.</ref> it is continuous as of 2011.<ref name="timesignals">{{Citation |url=ftp://ftp2.bipm.org/pub/tai/scale/TIMESIGNALS/timesignals.pdf |title=Time Signals |date=2011-06-20 |author=BIPM |authorlink=International Bureau of Weights and Measures |accessdate=2011-08-25}}</ref> There are over 100 users of the signal in Korea.<ref>[http://www.kriss.re.kr/time/research/service/hla_user.jsp List of HLA users] {{Webarchive|url=https://web.archive.org/web/20120304055754/http://www.kriss.re.kr/time/research/service/hla_user.jsp |date=2012-03-04 }} {{in lang|ko}}</ref> |
'''HLA''' is a [[time signal]] [[radio station]] in [[Daejeon]], [[South Korea]], operated by the [[Korea Research Institute of Standards and Science]]. Established on November 24, 1984, it transmits a 2 kW signal on 5 MHz (±0.01 Hz<ref name="timesignals"/>). Originally only transmitted for 7 hours per day (01:00–08:00), 5 days per week (M–F),<ref>{{Citation |url=http://www.itu.int/dms_pub/itu-r/oth/0A/08/R0A080000070001MSWE.doc |author=International Telecommunication Union |date=6 October 2010 |title=Characteristics of standard-frequency and time-signal emissions in allocated bands and characteristics of stations emitting with regular schedules with stabilized frequencies, outside of allocated bands |accessdate=2011-08-25 |archive-date=2012-11-06 |archive-url=https://web.archive.org/web/20121106155527/http://www.itu.int/dms_pub/itu-r/oth/0A/08/R0A080000070001MSWE.doc |url-status=dead }} Supplement to Recommendation ITU-R TF.768 “Standard frequencies and time signals”.</ref> it is continuous as of 2011.<ref name="timesignals">{{Citation |url=ftp://ftp2.bipm.org/pub/tai/scale/TIMESIGNALS/timesignals.pdf |title=Time Signals |date=2011-06-20 |author=BIPM |authorlink=International Bureau of Weights and Measures |accessdate=2011-08-25}}</ref> There are over 100 users of the signal in Korea.<ref>[http://www.kriss.re.kr/time/research/service/hla_user.jsp List of HLA users] {{Webarchive|url=https://web.archive.org/web/20120304055754/http://www.kriss.re.kr/time/research/service/hla_user.jsp |date=2012-03-04 }} {{in lang|ko}}</ref> |
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It broadcasts a time signal similar to that of the [[WWV (radio station)|WWV]] and [[WWVH]] stations with which it shares a frequency:<ref name="timesignals"/><ref>{{Citation |title=PUB 117: Radio Navigation Aids |author=National Geospatial-Intelligence Agency |authorlink=National Geospatial-Intelligence Agency |url=http://msi.nga.mil/NGAPortal/MSI.portal?_nfpb=true&_pageLabel=msi_portal_page_62&pubCode=0009 |year=2005 |pages=2–17 |accessdate=2011-08-25}}</ref> |
It broadcasts a time signal similar to that of the [[WWV (radio station)|WWV]] and [[WWVH]] stations with which it shares a frequency:<ref name="timesignals"/><ref>{{Citation |title=PUB 117: Radio Navigation Aids |author=National Geospatial-Intelligence Agency |authorlink=National Geospatial-Intelligence Agency |url=http://msi.nga.mil/NGAPortal/MSI.portal?_nfpb=true&_pageLabel=msi_portal_page_62&pubCode=0009 |year=2005 |pages=2–17 |accessdate=2011-08-25}}</ref> |
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Latest revision as of 12:03, 29 April 2024
36°23′15″N 127°21′59″E / 36.38753°N 127.36650°E HLA is a time signal radio station in Daejeon, South Korea, operated by the Korea Research Institute of Standards and Science. Established on November 24, 1984, it transmits a 2 kW signal on 5 MHz (±0.01 Hz[1]). Originally only transmitted for 7 hours per day (01:00–08:00), 5 days per week (M–F),[2] it is continuous as of 2011.[1] There are over 100 users of the signal in Korea.[3]
It broadcasts a time signal similar to that of the WWV and WWVH stations with which it shares a frequency:[1][4]
- Second pulses are 5 ms (9 cycles) of 1.8 kHz, beginning on the second
- Seconds 29 and 59 are omitted
- Minute markers are 800 ms of the same frequency
- Hour markers are 800 ms of 1.5 kHz
- DUT1 is encoded using doubled pulses
- Voice time announcements are made after second 52
- A time code is transmitted on a 100 Hz subcarrier
References[edit]
- ^ a b c BIPM (2011-06-20), Time Signals (PDF), retrieved 2011-08-25
- ^ International Telecommunication Union (6 October 2010), Characteristics of standard-frequency and time-signal emissions in allocated bands and characteristics of stations emitting with regular schedules with stabilized frequencies, outside of allocated bands, archived from the original on 2012-11-06, retrieved 2011-08-25 Supplement to Recommendation ITU-R TF.768 “Standard frequencies and time signals”.
- ^ List of HLA users Archived 2012-03-04 at the Wayback Machine (in Korean)
- ^ National Geospatial-Intelligence Agency (2005), PUB 117: Radio Navigation Aids, pp. 2–17, retrieved 2011-08-25
External links[edit]
- HLA (in Korean)This link is no longer valid.
- KRISS time and frequency dissemination (in English)This link is no longer valid.
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