For the curious, the National Institute of Standards and Technology (NIST) has a really interesting PDF with the history and technology of WWV, WWVB, and WWVH:

For the curious, the National Institute of Standards and Technology (NIST) has a really interesting PDF with the history and technology of WWV, WWVB, and WWVH: https://tf.nist.gov/general/pdf/1969.pdf https://tf.nist.gov/general/pdf/1969.pdf