PTB Braunschweig :

 

in this recording of that phase modulated signal you hear a real ID (Klaus Betke)

 

this QSL was issued to Andrea Dölle, the wife of Tom Rösner, in 2003
nice QSL card, issued for Mauro Giroletti in 2005
a look at the Antenna Farm in Mainflingen near Frankfurt (rb, 2008)
here a screenshot of the signal from a spectrum receiver, showing RBU (66,66 kHz), HBG (75 kHz), and DCF77 (77,5 kHz) (rb, 2009)

 

TX-Site Mainflingen

take a look at their own website

 

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Callsigns:
DCF77

 

Frequencies Morse Telegraphy:
77.5