HLA (radio station)
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:[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 ]- 1 2 3 BIPM (2011年06月20日), Time Signals (PDF), archived from the original (PDF) on 2021年10月10日, retrieved 2011年08月25日
- ↑ 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年11月06日, retrieved 2011年08月25日 Supplement to Recommendation ITU-R TF.768 "Standard frequencies and time signals".
- ↑ List of HLA users Archived 2012年03月04日 at the Wayback Machine (in Korean)
- ↑ National Geospatial-Intelligence Agency (2005), PUB 117: Radio Navigation Aids, pp. 2–17, retrieved 2011年08月25日
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[edit ]- HLA (in Korean)This link is no longer valid.
- KRISS time and frequency dissemination (in English)This link is no longer valid.
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