Coordinates: 36°23′15″N 127°21′59″E / 36.38753°N 127.36650°E / 36.38753; 127.36650 (HLA time signal antenna) 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:[4][1]
- Second pulses are 5 ms (9 cycles) of 1800 Hz, 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 1500 Hz
- DUT1 is encoded using doubled pulses
- Voice time announcements are made after second 52
- A time code is transmitted on a 100 Hz subcarrier
[edit] References
- ^ a b c BIPM (2011-06-20), ftp://ftp2.bipm.org/pub/tai/scale/timesignals.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, http://www.itu.int/dms_pub/itu-r/oth/0A/08/R0A080000070001MSWE.doc, retrieved 2011-08-25 Supplement to Recommendation ITU-R TF.768 “Standard frequencies and time signals”.
- ^ List of HLA users (Korean)
- ^ National Geospatial-Intelligence Agency (2005), PUB 117: Radio Navigation Aids, p. 2-17, http://msi.nga.mil/NGAPortal/MSI.portal?_nfpb=true&_pageLabel=msi_portal_page_62&pubCode=0009, retrieved 2011-08-25
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