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Priezor is an open-source passive magnetic antenna for electromagnetic listening. It is very sensitive and capable of capturing faint atmospheric events in VLF radio bands. Compared to regular Elektrosluch, it is less directional and focused, and therefore more useful in recording ambient electromagnetic fields, where the overall "sound of the place" is desired.

It is about 30dB (~31.6x) more sensitive than common pickup coils (measured at 1kHz). For recording VLF ("natural radio") sounds, it will perform best when paired with low-noise microphone preamplifier with at least 70 dB of gain (for example Sound Devices MixPre-3).

Custom-wound heptagonal magnetic antenna



Frequency response: 20 Hz – 90+ kHz

Antenna: 333 turns of 0.15mm enamelled copper wire

Loop resistance: ~300 Ω

Loop inductance: ~50 mH

Cable: 1.5m shielded high-flex microphone cable

Output: XLR-3M balanced

Source files on Github

Licensed as CC NC-BY-SA

Designed by Jonáš Gruska

Made in EU