The MOD 70 is a modulator of a 70MHz modulation/demodulation TV system, designed to transmit 1 video signal and 2 audio signals in the microwave band (2, 7, 10 and 14GHz bands), using up and down frequency converters and microwaves amplifiers. The intermediate frequency of 70MHz is standard, the same as the audio sub-carriers (7.02MHz and 7.5MHz). The 70MHz output signal is accompanied by the power supply that the transmission head needs.