[Elecraft] [OT] WWVB Time Transmissions

[John Magliacane]

 > Bill,
> WWVB added a new modulation format starting around 2012/13 that includes a phase shift that some older clocks can
> no longer resolve.

Gary,

The 2012 addition of BPSK modulation doesn't affect WWVB-controlled clocks -- only older carrier phase tracking receivers that use WWVB as a frequency reference that were designed prior to the October 29, 2012 modulation format change.

NIST has several receivers scattered around the country that monitor WWVB signal levels, 24 hours a day. You can check the status any time by going here:

 https://tf.nist.gov/tf-cgi/wwvbmonitor_e.cgi

Occasionally, WWVB is taken off the air for brief periods of time. Information on outages can be found here:

 https://www.nist.gov/pml/time-and-frequency-division/radio-stations/wwvb/wwvb-station-outages

NIST Special Publication 250-67 provides technical details regarding the transmitters, feedlines, antenna systems, and routine maintenance procedures employed at WWV, WWVB, and WWVH.


73 de John, KD2BD