NDB Holesov *HLV :
this recording was made with the help of an online receiver (rb, 2015)
QSL by detailed letter from the joint civil-military operators (Patrick Robic, 2000)
Obviously, the use later changed to 'civil', as this detailed letter explains (Dieter Pohlmann, 2010)
------------------------------------------------------------
Callsigns:
HLV
Frequencies Morse Telegraphy:
448