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Frequencies are permitted for amateur radio. To go on the air, there must be an official call sign. Transceiver circuit: https://radiopraktikum.blogspot.com/p... The transceiver is designed for radio communication by telegraph at the frequency of a quartz resonator. The transmitter is on one transistor pn2222, it is also a receiver-regenerator. On the transistor bc547, there is a pre-amplifier of sound.