This medium wave telegraph transmitter is modulated in tone by a Hartley oscillator. The circuit is powered by batteries and has a short range. L1 consists of 40 + 40 turns of wire 28 in a ferrite rod at least 10 cm long and L2 is formed by 20 turns of the same wire on the same rod. The supply can be made by voltages from 6 to 9 V.
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