Of course, the range of this transmitter found in a 1992 documentation is not exactly 4 km, as it depends on various factors such as antenna, location and receiver sensitivity. L1 is formed by 2 + 3 turns of 0.8 cm diameter wire without core. L2 consists of 5 loops of 1 cm diameter wire without core, L3 has 4 loops of 0.6 cm wire without core. The power supply must have at least 1 excellent filtration.
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