Patent ID: 7058136

Claim:
A method of generating on an output line a high-power modulated radio frequency signal from a low or medium frequency information signal, comprising: pulse-shaping the information signal using sampling having a sampling frequency to form a digital signal having at least two discrete signal values; generating for each of the two discrete signal values a corresponding alternating current (AC) radio frequency carrier signal including a first AC radio frequency carrier signal for a first one of the two discrete signal values and a second different AC radio frequency carrier signal for a second one of the two discrete signal values; using each discrete signal value to control connecting its corresponding AC radio frequency carrier signal to the output line to produce a switched radio frequency signal carrying the information signal; and filtering the switched radio frequency signal for obtaining the high-power modulated radio frequency signal, wherein in connecting the different corresponding AC radio frequency carrier signals to the output line, the times at which the connecting of any of the different AC radio frequency carrier signals is started or ended are chosen to coincide with a moment at which the respective AC radio frequency carrier signal is equal to zero or is close to zero to avoid energy losses during the starting or ending of the connecting.