PROCEDURE AND CIRCUIT FOR AMPLITUDE MODULATION OF CARRIER SIGNAL WITHREQUIRED MODULATION FACTOR

摘要

The amplitude of the carrier signal at the exit of the impedance adapter as the first amplitude value is measured. The amplitude value of the signal at the output of the impedance adapter is calculated as the second value which the signal should have resulting from amplitude modulation with the required modulation factor from the carrier signal featuring the amplitude of the first amplitude value. The setting of the transmitter is changed so that the amplitude of the carrier signal at the output of the impedance adapter is decreased. The amplitude of the new carrier signal at the output of the impedance adapter is measured as the new impedance value. The setting of the transmitter keeps being modified as long as the new amplitude value will be equal or lower from the predefined tolerance window around the aforementioned second amplitude value. The parameters of the new transmitter setting are stored as parameters of the transmitter setting, by which the transmitter shall generate the amplitude modulated transmitted signal in the required way. The setting of the amplitude modulation with the required modulation factor is performed automatically. The design of the transmitter circuit is thus simplified.