Test of three ferrite antennas for receiving very low frequency (VLF) signals.
The ferrite rods have been recycled from old radios. The material and frequency range is unfortunately unknown.
| Ferrite rod | Length (cm) | Diameter (cm) |
|---|---|---|
| Fer-A | 20 | 1 |
| Fer-B | 16.5 | 1 |
| Fer-C | 14 | 1 |
| Ferrite rod | Windings |
|---|---|
| Fer-A | 350 |
| Fer-B | 280 |
| Fer-C | 220 |
| Ferrite rod | f with 3.3 nF | f with 4.7 nF | f (own) |
|---|---|---|---|
| Fer-A | 37.19 kHz | 31.38 kHz | 216 kHz |
| Fer-B | 40.98 kHz | 34,56 kHz | 239 kHz |
| Fer-C | 52.97 kHz | 44.64 kHz | 309 kHz |
