There is a US
PR film about airline night flying which describes the beacons and includes their sound. I can't remember where I found it. It was from the mid-1930s.
US radio ranges were MF (300 - 400 kHz). Some were sited so that one of the AN paths was directly up the runway of an airport. An example was DCA on 332 kHz with a beam up the main runway at Washington National / DCA. The four-course beacon DCA has become nondirectional (NDB) "DC", still on 332.