HLA (radio station)

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 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

References
  1. BIPM (2011-06-20), Time Signals (PDF), retrieved 2011-08-25
  2. 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, retrieved 2011-08-25 Supplement to Recommendation ITU-R TF.768 “Standard frequencies and time signals”.
  3. List of HLA users Archived 2012-03-04 at the Wayback Machine (in Korean)
  4. National Geospatial-Intelligence Agency (2005), PUB 117: Radio Navigation Aids, pp. 2–17, retrieved 2011-08-25


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