About: WWVB

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WWVB is a time signal radio station near Fort Collins, Colorado and is operated by the National Institute of Standards and Technology (NIST). Most radio-controlled clocks in North America use WWVB's transmissions to set the correct time. The 70 kW ERP signal transmitted from WWVB is a continuous 60 kHz carrier wave, the frequency of which is derived from a set of atomic clocks located at the transmitter site, yielding a frequency uncertainty of less than 1 part in 1012. A one-bit-per-second time code, which is based on the IRIG "H" time code format and derived from the same set of atomic clocks, is then modulated onto the carrier wave using pulse-width modulation and amplitude-shift keying. A single complete frame of time code begins at the start of each minute, lasts one minute, and conve

Attributes	Values
rdf:type	geo:SpatialThing yago:Abstraction100002137 yago:Group100031264 yago:Network108434259 station yago:System108435388
rdfs:label	WWVB (en) WWVB (zh)
rdfs:comment	WWVB是由美國國家標準技術研究所（NIST, National Institute of Standards and Technology）所擁有的時碼發播台，位於美國科羅拉多州科林斯堡，其姊妹站是WWV。在北美地區，當地大部分電波時鐘都使用WWVB的時碼訊號，以設定正確的時間。WWVB 擁有一個 70千瓦的有效輻射功率發射機並利用 60 千赫的頻率發射對時訊號。而WWVB的對時訊號是利用原子鐘來作訊號來源，其不確定度小於 1/1012。WWVB每一比特每秒時間代碼，這是基於的時間代碼格式，是由同一組的原子鐘產生，然後調製到使用載波脈衝寬度調變及幅移键控。而時間代碼的單一完整的幀是開始於每分鐘的開始，每一幀持續一分鐘，當中包含年份，小時，分鐘等信息。雖然大部分授時台都是廣播該國的當地時間，但是美國跨越多個時區，所以WWVB廣播的時間訊號是協調世界時。而當地所售買的電波時鐘都可以設定為美國的四個時區及夏令時間而顯示出正確的本地時間。在2011年，國家標準技術研究所估計超過5000萬部時鐘及手錶配備了接收WWVB的對時訊號的能力。 (zh) WWVB is a time signal radio station near Fort Collins, Colorado and is operated by the National Institute of Standards and Technology (NIST). Most radio-controlled clocks in North America use WWVB's transmissions to set the correct time. The 70 kW ERP signal transmitted from WWVB is a continuous 60 kHz carrier wave, the frequency of which is derived from a set of atomic clocks located at the transmitter site, yielding a frequency uncertainty of less than 1 part in 1012. A one-bit-per-second time code, which is based on the IRIG "H" time code format and derived from the same set of atomic clocks, is then modulated onto the carrier wave using pulse-width modulation and amplitude-shift keying. A single complete frame of time code begins at the start of each minute, lasts one minute, and conve (en)
geo:lat	40.678055 (xsd:float)
geo:long	-105.046944 (xsd:float)
foaf:depiction
dcterms:subject	Radio stations established in 1963 Larimer County, Colorado Time in the United States Time signal radio stations National Institute of Standards and Technology 1963 establishments in Colorado
Wikipage page ID	325728 (xsd:integer)
Wikipage revision ID	1091408240 (xsd:integer)
Link from a Wikipage to another Wikipage	Amplitude-shift keying Radio stations established in 1963 Satellite navigation Binary-coded decimal Boulder, Colorado Daylight saving time Daylight saving time in the United States Decibel Larimer County, Colorado Huntsville, Alabama Phase-shift keying Phase modulation Universal Time JJY Very low frequency Time from NPL (MSF) Coordinated Universal Time Massachusetts Noise floor Frequency Gray code Antenna (radio) Loran-C Low frequency Commercial off-the-shelf Parity bit Pulse-width modulation Time zone Microsecond 1956 in radio 1963 in radio Time in the United States Time in the United States WWVB WWV (radio station) Watt Drop (telecommunication) Johnson–Nyquist noise Leap second Leap year Linear-feedback shift register Link budget WWVH American Recovery and Reinvestment Act of 2009 DCF77 DUT1 East Coast of the United States Fort Collins, Colorado Star tracker Urban density Gregorian calendar HBG (time signal) Hamming code Hamming distance Harvard College Inverse second Atomic fountain Ionosphere Atomic clock Time signal radio stations National Institute of Standards and Technology T-antenna TDF time signal Effective radiated power Helix building Skywave 1963 establishments in Colorado Marshall Space Flight Center Frequency-shift keying Mexico National Institute of Standards and Technology Ordinal date Radio clock Redstone Arsenal World Geodetic System Signal-to-noise ratio Shortwave radio Time signal

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