Natural radio signal recording with electric filed receiver: RS4 with a 1m stilus, T antenna or long wire, using a simply cassette recorder as data support (except for une example). Then frequency range of 100 Hz-12kHz and dynamic range of 40dB or worse. A very basic setup.

230397-0500

The same wistler recorded in two different places at 150 km distance: Cumiana and Pavia. (Thanks to Ezio Mognaschi IW1GOO for the collaboration from Pavia University)

060899-1400

Recorded with T antenna connected to the micro input of SoundBlaster Card (at those time I was a beginner: don't repeat this setup, can be dangerous and damage the PC). Strong static activity. Note the strange silence from 2 and 3 kHz. Same results with a pocket loop of 75 cm.

080197-0102

Tweeks storm:  4 different resonance frequencies are identifiable: 6,6 kHz - 4,9 kHz - 3,3 kHz and 1,6 kHz. Recording from home with RS4 receiver placed outdoor.

120396-0301

"Flying saucer" (the strange W at the bottom of spectrogram), recorded with RS4 receiver with 10m whip antenna. Usually recorded by satellites, very rare at ground level.

121295-2050

This signal (present around 2 kHz) sounds like a frog's croak. Statics and 50 Hz harmonics are also visible in the spectrogram. Recording from my home with RS4 placed at 100m outdoor, with 10m whip.

140894-1305

This signal sound like bees buzzing close to the ear. Recorded on top of a mountain at 2650m over see level, with RS4 receiver and 1m whip.

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