The National Research Council (NRC) or Conseil national de recherches Canada (CNRC) operates radio station CHU on three frequencies (3330 kHz, 7850 kHz, and 14670 kHz) to maintain official time for Canada. They can be heard on at least one of the frequencies 24 hours per day depending on propagation. They issued the QSL cards seen below for my reception reports. CHU’s English language website is at https://www.nrc-cnrc.gc.ca/eng/services/time/short_wave.html