With the real possibility of a WWV shutdown in our near future, I started thinking about what would be needed for the amateur service to stand up a service of similar utility. It's not something that I'm considering doing tomorrow, but it does seem like a reasonable thing to think about if WWV shuts down. Technically, the WWV and WWVB transmissions are quite simple. Keeping them synchronized to UTC should also be simple, via NTP and a good local clock. Achieving the same level of frequency and time accuracy as NIST is probably not realistic, but getting within a few msec is certainly possible. Then again, are the WWV* formats the best? They require full-time transmission, but they could be compressed into shorter transmissions if higher bit-rates were used, which might also allow higher power without higher power cost. WWV uses AM, but would SSB be better? Or FSK or PSK? From a regulatory standpoint, an amateur version of WWV might require some minor rule changes. Broadcasting is specifically disallowed, but since W1AW regularly broadcasts "code practice," we are probably not far from finding a lawful way to do a WWV clone on the ham bands. WSPR already transmits data regularly for propagation research, so perhaps something similar could be done with a time encoding? That might get two birds with a single stone? So I'm curious what people think about that idea in general, and what issues (and associated solutions) might be encountered. Some fuel for the thought experiment fire: Power levels? Hams do reliable, low-data-rate communications all the time with 100W and even lower power levels. Since increasing power means increased equipment and operating costs, what would be a good power target? Location? Locations? Frequencies? Format(s)? I'm thinking both base transmission mode and data encoding, as well as timing (full- vs. part-time transmission). Content? What would you put in such a service besides just time? Regulatory challenges and minimum changes to fix them? One other thing that might be interesting to discuss is the uses. A couple come to mind: Propagation information. Amateur-specific timing source (for you FT8 people ). But there could easily be more uses for such a service, to make it more worth the effort. I'm mostly thinking blue-sky at this point, but feel free to be brutally practical -- if you were going to start a new HF time service from scratch, for amateur and SWL use, what options would you pick?