WWVB
Sign in to saveWWVB is a longwave 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.
Wikidata facts
- Official website
- www.nist.gov/pml/div688/grp40/wwvb.cfm
- Image
- WWVB Antenna.jpg
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~37 min read
Article
22 sectionsContents
- History
- Service improvement plans
- Antennas
- Modulation format
- Amplitude modulation
- Phase modulation
- Allowance for carrier phase tracking receivers
- Station ID
- Amplitude-modulated time code
- Announcement bits
- Phase modulated time code
- One-minute time frames
- Announcement bits
- DST and leap second warning
- DST schedule
- Message frames
- Six-minute time frames
- Propagation
- Footnotes
- See also
- References
- External links
WWVB is a longwave 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 normal signal transmitted from WWVB is 70 kW ERP and uses a 60 kHz carrier wave yielding a frequency uncertainty of less than 1 part in 10. The time code signal is derived from a set of atomic clocks located at the site, and transmitted using the IRIG "H" format and modulated onto the carrier wave using pulse-width modulation and amplitude-shift keying at one bit per second. A single complete frame of time code begins at the start of each minute, lasts one minute, and conveys the year, day of year, hour, minute, and other information .
On the map
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