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 2018-02-14)


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


Opposite cardioids (top: west, bottom: east)





8.27 and 5.17 kHz, 424 µHz FFT, 10 minute scroll (top: EW, 2nd: NS, 3rd: V omni, bottom: W cardioid)


8270.005 and 8270.1 Hz (unspread PSK) phase-colour spectrogram, 424 µHz FFT, 10 minutes (W cardioid)


8270.1 Hz (unspread PSK) amplitude and phase plot



8.27 kHz, 20.93 µHz FFT resolution, 2 hour scroll, EbNaut data export 13.23 h (top: W cardioid, bottom: NS)


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


ZEVS (Kola Peninsula Transmit Facility, 2475 km) at 82 Hz, 7.63 mHz FFT, 1 minute scroll (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)

ZEVS received by Edgar J. Twining in Moonah, Tasmania, 15285 km on Jan 23 (phase colour, E-field)


Snapshot of a fast ZEVS transmission, using 10 second symbols (45.8 mHz FFT, 5 s scroll)


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


European lightning map from Blitzortung.org

VLF grabbers:   DF6NM   DK7FC (tree)   Paul Nicholson   IK1QFK   SQ5BPF