Panels made in metal case with bench support and the electrical scheme on the front panel. This board shall represent, together with SSB transmitter, a complete communication system, operating at a frequency of about 1.4 MHz. Technical features: The board shall be composed of: the fixed tuning antenna circuit and the radio frequency amplifier, the converter with local oscillator at 1 MHz, the intermediate frequency amplifier and the SSB demodulator with the beat oscillator, the audio amplifier and the loudspeaker. Power supply: ± 15 Vdc, 300 mA With this trainer it must be possible to perform the following exercises: performance of local oscillators (LFO) and beat frequency oscillators (BFO) for demodulation  performance of the RF amplifier, of the IF stage, of the demodulator, of the audio amplifier receiver alignment realization and study, with SSB TRANSMITTER, of a complete communication system.panels made in metal case with bench support and the electrical scheme on the front panel. This board shall represent, together with SSB transmitter, a complete communication system, operating at a frequency of about 1.4 MHz. Technical features: The board shall be composed of: the fixed tuning antenna circuit and the radio frequency amplifier, the converter with local oscillator at 1 MHz, the intermediate frequency amplifier and the SSB demodulator with the beat oscillator, the audio amplifier and the loudspeaker. Power supply: ± 15 Vdc, 300 mA With this trainer it must be possible to perform the following exercises: performance of local oscillators (LFO) and beat frequency oscillators (BFO) for demodulation  performance of the RF amplifier, of the IF stage, of the demodulator, of the audio amplifier receiver alignment realization and study, with SSB TRANSMITTER, of a complete communication system.