Received by Alberto I2PHD in JN45sl with the mini-whip active antenna connected with an audio transfomer
(ratio 1 : 7) to the line input of the Delta 44 sound card, and using the Winrad software.
The audio can be heard by clicking here
The frequency didn't stay precise;y at 17.2 kHz (corresponding to 700 Hz in the capture below)
but, on the other hand, the Alexanderson alternator is not a Caesium standard... :-)