WWVH is the Pacific sister station to WWV, and has a similar broadcast format. Like WWV, WWVH's main function is the dissemination of official U.S. Government time, through exactly the same methods as found on WWV's signal.
To minimize interference with the WWV broadcasts on the same frequencies, WWVH's broadcasts on 5, 10 and 15 MHz are directional, pointed primarily west. Despite this strategy, in certain places, particularly on the west coast of North America; and at certain times, due to ionospheric conditions (atomic time and atomic clock), the listener can actually hear both WWV and WWVH on the same frequency at the same time. The information modulated on the carrier is modified to reduce confusion if both are received simultaneously. In particular, voice announcements on one correspond to silent periods on the other. WWVH uses a female voice (Jane Barbe) to distinguish itself from WWV, which uses a male voice. WWVH time signals can also be accessed by telephone.
WWVH broadcasts its signal on four transmitters, one for each frequency. The 2.5 MHz transmitter puts out an ERP of 5 kW, while the other transmitters use 10 kW of ERP. The 2.5 MHz antenna is one half-wavelength tall, and radiates in an omnidirectional pattern. The remaining antennas each consist of two elements one half-wavelength tall and horizontally separated by one quarter-wavelength. The signal radiating from one element is in quadrature phase with respect to the signal from the other. This results in a cardioid radiation pattern with a maximum gain directed west.
Recording of WWVH from 4:58:43 to 5:03:08 UTC on March 16, 2015.Notice of Upcoming Research from WWVH
The WWVH signal is extremely similar to the WWV signal, but some changes have been made to reduce confusion if both are heard at once:[2]
The 5 ms second ticks are 6 cycles of 1,200 Hz rather than 5 cycles of 1,000 Hz. The 800 ms minute beep is also 1,200 Hz. (Like WWV, this is omitted during minutes 29 and 59, and changed to 1,500 Hz at the top of each hour.)
The voice announcements use a female voice (that of Jane Barbe) and last 7.5 seconds starting 15 seconds before the minute. (WWV broadcasts in a male voice during the last 7.5 seconds of each minute.)
The audio tones sent during the first 45 seconds of most minutes are swapped: 600 Hz is played during even minutes, and 500 Hz is played during odd minutes. (Receiving both simultaneously gives the listener a sound similar to a continuously-ringing chime.)
The A440 tone marking the hour is sent during minute 1 (as opposed to minute 2 for WWV). Like WWV, it is omitted during the first hour of each UTC day.
The audio tones are suppressed while WWV is transmitting voice announcements: minutes 00, 08–10, 14–19, and 30.
The voice announcements are rescheduled relative to WWV:
Station identification is made during minutes 29 and 59 (vs. 00 and 30)
NOAA space weather geoalerts are transmitted during minute 45 (vs. 18)
National Weather Service storm warnings for all sections of the Pacific Ocean are broadcast during minutes 48–51, overflowing to minute 52 when necessary (vs. Atlantic and northeast Pacific information during 08–10 and 11).
Minutes 03 and 47 are used for NIST special announcements when necessary (vs. 04 and 16). Like WWV, prior to the OMEGA Navigation System shutdown in 1997, the OMEGA status report was broadcast at :47 past the hour.
Half-hourly station identification announcementedit
WWVH identifies itself twice each hour, at 29 and 59 minutes past the hour. The text of the identification is as follows:
National Institute of Standards and Technology Time. This is radio station WWVH, Kauai, Hawaii, broadcasting on internationally allocated standard carrier frequencies of 2.5, 5, 10 and 15 megahertz, providing time of day, standard time interval, and other related information. Inquiries regarding these transmissions may be directed to the National Institute of Standards and Technology, Radio Station WWVH, Post Office Box 417, Kekaha, Hawaii 96752. Aloha.
Reception reports sent to that address will on request be answered with a QSL card.[3]
Telephone serviceedit
WWVH's time signal can also be accessed by calling +1 (808) 335-4363.[4]
^"NBS Miscellaneous Publication 236 (1967 edition): NBS Standard Frequency and Time Services" (PDF). (PDF) from the original on May 17, 2017. Retrieved February 8, 2019.
^ abNelson, Glenn; Michael Lombardi; Dean Okayama (2005). (PDF). NIST. Archived from the original (PDF) on January 25, 2017. Retrieved January 26, 2017.
^QSL Gallery for NIST Radio Stations September 11, 2017, at the Wayback Machine
^Lombardi, Michael A. (September 24, 2009). "Telephone Time-of-Day Service". NIST. from the original on July 3, 2019. Retrieved July 3, 2019.
wwvh, callsign, national, institute, standards, technology, shortwave, radio, time, signal, station, located, barking, sands, missile, range, kekaha, island, kauai, state, hawaii, 98778, 76306, 98778, 76306, antenna, field, pacific, sister, station, similar, b. WWVH is the callsign of the U S National Institute of Standards and Technology s shortwave radio time signal station located at the Barking Sands Missile Range in Kekaha on the island of Kauai in the state of Hawaii 21 59 16 N 159 45 47 W 21 98778 N 159 76306 W 21 98778 159 76306WWVH antenna field WWVH is the Pacific sister station to WWV and has a similar broadcast format Like WWV WWVH s main function is the dissemination of official U S Government time through exactly the same methods as found on WWV s signal To minimize interference with the WWV broadcasts on the same frequencies WWVH s broadcasts on 5 10 and 15 MHz are directional pointed primarily west Despite this strategy in certain places particularly on the west coast of North America and at certain times due to ionospheric conditions atomic time and atomic clock the listener can actually hear both WWV and WWVH on the same frequency at the same time The information modulated on the carrier is modified to reduce confusion if both are received simultaneously In particular voice announcements on one correspond to silent periods on the other WWVH uses a female voice Jane Barbe to distinguish itself from WWV which uses a male voice WWVH time signals can also be accessed by telephone NIST Time Signal Station Services 1 Station Yearin service Year outof service Radiofrequencies Audiofrequencies Musicalpitch Timeintervals Timesignals UT2correction Propagationforecasts Geophysicalalerts WWV 1923 WWVH 1948 WWVB 1963 WWVL 1963 1972 Contents 1 Transmission system 2 Broadcast format 3 Half hourly station identification announcement 4 Telephone service 5 See also 6 References 7 External linksTransmission system editWWVH antenna coordinates 2 2 5 MHz 21 59 20 9 N 159 45 52 4 W 21 989139 N 159 764556 W 21 989139 159 764556 5 MHz 21 59 10 8 N 159 45 44 8 W 21 986333 N 159 762444 W 21 986333 159 762444 10 MHz 21 59 18 2 N 159 45 51 3 W 21 988389 N 159 764250 W 21 988389 159 764250 15 MHz 21 59 15 3 N 159 45 50 0 W 21 987583 N 159 763889 W 21 987583 159 763889 WWVH broadcasts its signal on four transmitters one for each frequency The 2 5 MHz transmitter puts out an ERP of 5 kW while the other transmitters use 10 kW of ERP The 2 5 MHz antenna is one half wavelength tall and radiates in an omnidirectional pattern The remaining antennas each consist of two elements one half wavelength tall and horizontally separated by one quarter wavelength The signal radiating from one element is in quadrature phase with respect to the signal from the other This results in a cardioid radiation pattern with a maximum gain directed west Broadcast format editMain article WWV radio station Broadcast format source source track Recording of WWVH from 4 58 43 to 5 03 08 UTC on March 16 2015 source source Notice of Upcoming Research from WWVH nbsp The WWVH signal is extremely similar to the WWV signal but some changes have been made to reduce confusion if both are heard at once 2 The 5 ms second ticks are 6 cycles of 1 200 Hz rather than 5 cycles of 1 000 Hz The 800 ms minute beep is also 1 200 Hz Like WWV this is omitted during minutes 29 and 59 and changed to 1 500 Hz at the top of each hour The voice announcements use a female voice that of Jane Barbe and last 7 5 seconds starting 15 seconds before the minute WWV broadcasts in a male voice during the last 7 5 seconds of each minute The audio tones sent during the first 45 seconds of most minutes are swapped 600 Hz is played during even minutes and 500 Hz is played during odd minutes Receiving both simultaneously gives the listener a sound similar to a continuously ringing chime The A440 tone marking the hour is sent during minute 1 as opposed to minute 2 for WWV Like WWV it is omitted during the first hour of each UTC day The audio tones are suppressed while WWV is transmitting voice announcements minutes 00 08 10 14 19 and 30 The voice announcements are rescheduled relative to WWV Station identification is made during minutes 29 and 59 vs 00 and 30 GPS satellite health reports are transmitted during minutes 43 and 44 vs 14 and 15 NOAA space weather geoalerts are transmitted during minute 45 vs 18 National Weather Service storm warnings for all sections of the Pacific Ocean are broadcast during minutes 48 51 overflowing to minute 52 when necessary vs Atlantic and northeast Pacific information during 08 10 and 11 Minutes 03 and 47 are used for NIST special announcements when necessary vs 04 and 16 Like WWV prior to the OMEGA Navigation System shutdown in 1997 the OMEGA status report was broadcast at 47 past the hour Half hourly station identification announcement editWWVH identifies itself twice each hour at 29 and 59 minutes past the hour The text of the identification is as follows National Institute of Standards and Technology Time This is radio station WWVH Kauai Hawaii broadcasting on internationally allocated standard carrier frequencies of 2 5 5 10 and 15 megahertz providing time of day standard time interval and other related information Inquiries regarding these transmissions may be directed to the National Institute of Standards and Technology Radio Station WWVH Post Office Box 417 Kekaha Hawaii 96752 Aloha Reception reports sent to that address will on request be answered with a QSL card 3 Telephone service editWWVH s time signal can also be accessed by calling 1 808 335 4363 4 See also editRadio clock time signal receiversReferences edit NBS Miscellaneous Publication 236 1967 edition NBS Standard Frequency and Time Services PDF Archived PDF from the original on May 17 2017 Retrieved February 8 2019 a b Nelson Glenn Michael Lombardi Dean Okayama 2005 NIST Special Publication 250 67 NIST Time and Frequency Stations WWV WWVH and WWVB PDF NIST Archived from the original PDF on January 25 2017 Retrieved January 26 2017 QSL Gallery for NIST Radio Stations Archived September 11 2017 at the Wayback Machine Lombardi Michael A September 24 2009 Telephone Time of Day Service NIST Archived from the original on July 3 2019 Retrieved July 3 2019 External links editMap all coordinates using OpenStreetMap Download coordinates as KML GPX all coordinates GPX primary coordinates GPX secondary coordinates AT THE TONE A Little History of NIST Radio Stations WWV amp WWVH 1955 2005 c 2009 Myke Dodge Weiskopf Obscure Disk Retrieved from https en wikipedia org w index php title WWVH amp oldid 1220665416, wikipedia, wiki, book, books, library,
