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Some more interesting below 22 kHz
by Wolfgang Schippke, DC3MF

Picture 1) Several interesting efects (Measured: 04th Feb. 2001)
A) There is a transmission on 18.162 kHz for two times (90 to 140 S, and 20 S later)
B) a real interesting signal between 15.8 and 18.010 kHz pulsing
C) a transmission (am sound) on 14.673 kHz
(This picture is taken with a Ferrite Antenna with a coil of about 7000 turns and with a small amplifier)