10 MHz reference from France Inter

The "High-predston DLF-based locked frequency reference" we published in the April 1989 issue (p. 48), derived its stability from the Deutschland Funk (DLF) longwave transmitter operating on 153 kHz. lt is almost certain that in many areas the French broadcast transmitter Franeo-Inter, operating on 162 kHz, will give a much stranger signal. That is because FranceInter radiates 2000 kW, whereas DLF radiates 500 kW by day and 250 kW by night.