⏰Atomic Time & Calibration StandardsBAND: HF Standard Frequency & TimeITU: HF (High Frequency / Shortwave)
10.000 MHz WWV NIST Atomic Standard Time & Solar Bulletin
Exact: 10,000 kHz (10.000 MHz)Demodulation: AMService: United States
WWV on 10.000 MHz is the world’s most recognized standard frequency and atomic time radio station. Operated by the US National Institute of Standards and Technology (NIST) in Fort Collins, Colorado.
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Technical Radio Frequency Profile
- Modulation Standard
- Amplitude Modulation (A3E with 100 Hz subcarrier BCD time code)
- Channel Grid / Bandwidth
- Standard Frequency Service Channel (Center-tuned 10.000000 MHz)
- Transmitter Power (Typical)
- 10,000 Watts (10 kW continuous carrier)
- Polarization
- Vertical half-wave dipole arrays
- Signal Propagation Mode
- Ionospheric F2 Layer Skywave Reflection
- Typical Broadcast Range
- Continental and trans-Atlantic / trans-Pacific skywave propagation
Operational Protocol & Use Case
Serves as primary calibration reference for laboratory instruments, marine navigators, watch calibration, and amateur radio operators assessing ionospheric propagation conditions.
Listening & SDR Tuning Tips
- Listen at :00 of each minute for the spoken voice announcement: "At the tone, [Hour] hours, [Minute] minutes, Coordinated Universal Time."
- Listen at :18 past the hour for the NOAA Space Weather Prediction Center (SWPC) Solar-Terrestrial bulletin.
Frequently Asked Questions about 10.000 MHz
What are the audio tones heard on WWV?
WWV alternates between 500 Hz tones on even minutes and 600 Hz tones on odd minutes, alongside continuous 100 Hz subcarrier BCD time code pulses.
How accurate is the WWV 10 MHz radio signal?
WWV’s carrier frequency is derived from NIST cesium atomic fountain clocks and is accurate to within 1 part in 100 trillion (1x10^-14).