WWV (radio station)
WWV is the call sign of an American short-wave transmitter for the dissemination of official U.S. time UTC time signal means. The transmitter operates on five round frequencies in continuous operation.
Content of the consignment
The American authority National Institute of Standards and Technology (NIST ) spread by the transmitter WWV from Fort Collins in Colorado time signal on the shortwave frequencies 2.5, 5, 10, 15 and 20 MHz.
To broadcast the IRIG timecode in the format IRIG H will be used. The signal can also be heard on the phone announcement 1-303-499-7111. In addition, each hour will be at defined times disseminated weather warnings for sea, the status of the GPS and geophysical warnings for radio propagation.
The advantage of the short waves (also famous Russian and Chinese time signal transmitter carrier wave use ) is a good reflection of ionospheric layers, the time signal is a large, somewhat changing range.
Long-wave transmitter WWVB
At the same site a long wave transmitter with the call WWVB is operated on the frequency 60 kHz.
Shortwave transmitter WWVH in Hawaii
For the Pacific, NIST also operates a shortwave station with the call sign WWVH in Kekaha on the island of Kauai in Hawaii. The transmission frequencies are 2.5 MHz, 5 MHz, 10 MHz and 15 MHz. To distinguish the emission of WWV on the same frequencies WWVH used a female voice. This signal can also be heard on the phone announcement 1-808-335-4363.