This transceiver circuit was found in a 1997 documentation. The circuit operates in the 80 meters range (3.5 MHz) and can be used in short and medium distance communications with an external antenna, or even by radio amateurs. The power transistor must be equipped with a heat radiator. We also give details of the coils that are formed by 43 turns of 0.2 mm wire. C capacitors are 100 pF ceramic.
