Run A Mainframe

Operating System

On Your PC

It does happen in certain atmospheric conditions that no signal can be heard.
If you hear nothing but static try again later. Reception is often best when it is
twilight or evening in the eastern US.

Want to WWV listen? This is the place.

The signal comes and goes depending on atmospheric conditions

The transmitter is in Fort Collins, CO USA. -- This receiver is in Charlotte, NC USA. -- More online receivers are at DXZone

The WWV time signal transmitter is located in the western United States at Fort Collins, Colorado. It operates on 2.5, 5, 10, 15, and 20 Mhz 24/7. Due to the nature of radio propagation which changes from night to day the lower (2.5, 5, and 10 Mhz) frequencies are best at night and the higher (15 and 20 Mhz) frequencies are best during the day. Which particular frequency is optimal will vary according to the time of day as well as season of the year and even the state of solar activity. Embedded in the vocal time annoucement and second hand tick are timing signals which can be decoded by specialized equipment and even a pc with specal software that has the audio from a shortwave recevier connected via the line-in jack. The signals sent are synchronized to an atomic clock and are considered the most stable and accurate timing signals widely available on Earth.

The Clock Room at WWV

The Transmitter area at WWV

WWV's Building