Note: this repository was originally posted as ka9q/WWV, but the original repository is gone.

WWV/WWVH emulator. Full format including 100 Hz timecode. Speech using bundled voice data from kalafut's WWV simulator.

This started as a quick hack but ended up fully functional. The program generates raw 16-bit linear PCM mono audio at a 16 kHz sample rate on standard output. So to hear it, pipe it into your local audio player, e.g.,

# for Linux
wwvsim | aplay
# for macOS with sox
wwvsim | ./wwvsim | play -t raw -b 16 -e signed-integer -r 16000 -c 1 -

Or for the WWVH format:

# for Linux
wwvsim -H | aplay
# for macOS with sox
wwvsim -H | ./wwvsim | play -t raw -b 16 -e signed-integer -r 16000 -c 1 -

Without arguments, it generates a WWV program using your local computer's clock. Run wwvsim with a bogus argument, e.g., 'wwvsim -?' to get a list of command line arguments.

The program relies on pre-generated speech audio to make the announcements.

The program tries to synchronize the output to the correct time but there are invariably errors due to buffering in your computer's audio system. It also relies on the accuracy of your computer's clock, which should be controlled by the Network Time Protocol. So this program is really a novelty; don't use it for anything really precise. That's what the original WWV and WWVH are for!

Just run make -j4. It will take a while for the pre-generated voice data to be compiled in.

In addition to the time and station ID, there are other announcments made throughout every hour.

• HamSCI announcement on minute 3 on WWVH and minute 4 of WWV
• HamSCI test signal on minute 8 on WWV and minute 48 of WWVH
• DoD M.A.R.S. announcements on minute 10 of WWV and minute 50 on WWVH (currently not used)
• Geophysical alerts on minute 18 of WWV and minute 45 on WWVH
• Telephone availability for WWVH on minutes 47 & 52