On this page, you can hear an actual recording from the German DCF-77 time
signal. The file plays from the :55 second mark of one minute to :04
seconds into the next minute. You can hear the transition to the new minute
as there is no break for two seconds around :59. You can also see and hear
the highs and lows forming the DCF-77 code.
How I got this signal: I have an old radio clock with an external antenna
the size of a cookie tin. There is a headphone output on the tin. I
recorded the signal from this output so you could hear what it sounds like.