I synchronize mine to msf here in the UK.
DCF unlike MSF has a spare aerial and transmitter so the signal never ceases like MSF, however I never understood why the minute marker is a blank, you have to rely on your crystal osc accuracy, unless I misunderstood the datasheet for DCf which is quite possible.
I was reffering to the minute marker second zero, MSF tranmitts a longer marker for zero, so you have a reference of the new minute, DCF transmitts a continous carrier from the end of second 59 till the start of second 1, or something likw that.
@ Beast Lee
Thank you for compliment! You should know that English is not my native language and so sometimes I have problems with understanding sayings and phrases. What do you mean with "...dig the single digit clock..."?