Suitable for listening only to the strongest local FM stations
Parts:
- Dipole: two brass rods, 60 cm (2 ft) long each
- Balun transformer: TV balun core, 2 x 4 turns, 27 AWG (0.4mm)
- Coil:
primary: 2 turns, 24 AWG (0.6mm)
secondary: 4.5 turns, 18 AWG (1mm), tap at 1.5 turn
coil diameter: ~8 mm
spacing between primary and secondary: 1 - 2 mm
- Tuning capacitor: 5-35 pF
- Diode: high frequency point contact germanium diode, eg. Д18, Д20, OA1160, OA1172, AA119, 1N34 (gold-bonded germanium diodes are unusable at high frequencies, due to their large junction capacity).
- Filter capacitor: ~ 100 - 500 pF
- Headphones: high impedance, with appropriate RC matching network (8k2, 100 nF)
