DL0AO VLF-Grabber near Amberg, JN59VK

Antenna comparison: H = 150 m long earth dipole approx. east-west 57°/237° (left channel, with 1pps added), E = active E-field probe (right channel)

VLF wideband, 2.93 Hz FFT resolution, 2 minute scrolling, upload every 10 minutes (noise blanker and autonotch disabled)

Colour-DF pre-test: active antenna for omnidirectional E-field, earth dipole instead of a circular-polarized loop pair (west is blue, east is red)

8.27 kHz, 424 µHz FFT resolution, 10 minute scrolling

424 uHz Synthetic cardioid E-H, looking 232° west-southwest

8.27 kHz, 31.4 µHz FFT resolution, 1 hour scrolling, EbNaut data export (top: E-H cardoid w-sw, bottom: E omnidirectional)

JJY 40 kHz, 848 µHz FFT resolution, 10 minute scrolling (bottom: colour DF, east is red)

ZEVS 82 Hz, 3.82 mHz FFT, 2 minute scroll (active E-field probe)

ZEVS phase vs GPS (retarding R-G-B-R), 424 uHz FFT, 10 minute scroll

Snapshot of opposite cardioid patterns (top: west 232°, bottom: east 52°)

European lightning map from Blitzortung.org

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