The coil of this receiver determines the range. It can have 2 to 10 turns of wire 20 to 24 in the form of 1 cm without core to receive from 27 MHz to 150 MHz. The circuit is critical and already includes a good amplifier. The antenna is telescopic from 60 to 120 cm. The power can be made with 4 batteries, 9 V battery or source.
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