in this recording of that phase modulated signal you hear a real
ID (Klaus Betke)
Joop Balneger received this
verification letter in 1981
this QSL was issued to Andrea Dölle, the wife of Tom Rösner,
in 2003
a look at the antenna farm in Mainflingen near Frankfurt (rb,
2008)
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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)
nice QSL card, issued for Meikel from the UTDX-group in 2019
TX-Site Mainflingen
take a look at their own website
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Callsigns:
DCF77
Frequencies Morse Telegraphy:
77.5