@bender I guess most clocks don’t support that. 😅 My wrist watch can do it, you can select it in the menu:

https://movq.de/v/ccb4ffcbc5/s.png

In general, different transmitter means different frequency and different encoding, for example these two:

• https://en.wikipedia.org/wiki/DCF77
• https://en.wikipedia.org/wiki/Time_from_NPL_(MSF)