WWV transmits standard frequencies on 2.5 5, 10, 15, 20, and, experimentally, 25 MHz, derived from an ensemble of ceslium-beam stabilized clocks. Doppler shifts of the skywave results in received frequency error of up to 1 Hz or more, or 1 part in 10 to the 7th power. WWVB reduces this error several orders of magnitude by transmitting a 60 kHz signal, which propagates by ducting through the atmosphere, rather than by skywave.
![](https://californiahistoricalradio.com/wp-content/uploads/2017/02/CHRS-Construction-BPSK-Dephaser-Feature-Photo-e1487745442423.jpg)
This Post Has 0 Comments