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 2017-10-08)


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


Alpha Colour-DF, 3.9 Hz FFT, two 3.6 s cycles every half hour (green: Krasnodar, red: Novosibirsk, purple: Khabarovsk)


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 and 6.47 kHz, 424 µHz FFT resolution, 10 minute scroll (top: EW, 2nd: NS, 3rd: V omni, bottom: W cardioid)


8.27 or 6.47 kHz, 31.4 µHz FFT resolution, 1 hour scrolling, EbNaut data export (top and middle: EW, bottom: W cardioid)



6.47 kHz, 9.3 µHz FFT resolution, 2 hour scroll, EbNaut data (top: EW antenna, bottom: W cardioid)


970 Hz, 424 µHz FFT, 10 minute scroll (top: EW earth loop, bottom: E-field)


ZEVS phase vs GPS (retarding R-B-G-R, carrier frequency seems to be 0.11 ppm below 82 Hz), 424 uHz FFT, 10 minute scroll (E-field)


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

E-field probe at home of DF9RB (JN59VO)




DF9RB: 8.27 kHz, 421 µHz 10 minutes (top) and 31 µHz 1 hour (bottom)


DF9RB: ELF and ZEVS, 7.6 mHz FFT, 1 minute scroll


European lightning map from Blitzortung.org

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