DL0AO VLF-Grabber near Amberg, JN59VK

Antenna comparison: Two 150 m long earth dipoles (underground loops): EW = east-west 265°, NS = north-south 355°, and V = active E-field probe
(updated 2017-08-03)

Colour-DF with the two earth loops (180° ambiguous)

VLF wideband, 1.95 Hz FFT resolution, 2 minute scrolling, upload every 10 minutes (noise blanker and autonotch disabled)
Top: EW, middle: NS, bottom: Vertical

Experimental cardioids (top: west, bottom: east)

8.27 kHz, 424 µHz FFT resolution, 10 minute scrolling (top: EW, 2nd: NS, 3rd: V omni, bottom: W cardioid)

8.27 kHz, 31.4 µHz FFT resolution, 1 hour scrolling, EbNaut data export (top: EW, middle: NS, bottom: W cardioid)

3.675 kHz, 9.3 µHz FFT resolution, 2 hour scroll, EbNaut data (W cardioid)

JJY 40 kHz colour-DF, 848 µHz FFT resolution, 10 minute scrolling

ELF and ZEVS, 3.8 mHz FFT, 2 minute scroll (V)

Snapshot of opposite cardioid patterns (top: west 265°, bottom: east 85°)

European lightning map from Blitzortung.org

Links:   DL0AO (earth antenna only)   DF6NM   DK7FC (tree)   OK2BVG   Paul Nicholson   IK1QFK   G3ZJO