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That’s why your friends add a loading coil when they 121want to tune for the long wave-length stations, that is, those with a low frequency.

Usually, therefore, one connects into his antenna circuit both a condenser and a loading coil.

For quite a range of wave-lengths we may use the same loading coil and tune the antenna circuit entirely by this series condenser.

For some other range of wave-lengths we shall then need a different loading coil.

The calculation of the size of loading coil is quite easy but requires more arithmetic than I care to impose on you at present.