METHOD OF DETERMINING FREQUENCY Russian patent published in 2006 - IPC G01R23/00 

FIELD: radio electronics.

SUBSTANCE: method comprises seeking the signal in a given frequency range by adjusting super-heterodyne receiver, forming frequency sweep on the screen of the tube, converting the frequency of the received signal, amplifying the voltage of the signal, decoding, and sending the signal to the vertically deflecting plates of the tube. The screen displays the pulse whose position on the frequency sweep determines the carrier frequency of the received signal. The root-mean-square coefficient of amplitude modulation, root-mean-square deviation of the frequency, the spectrum width of the received signal, and ratio of the spectrum width to the specific frequency deviation are then determined. The root-mean-square coefficient of the amplitude modulation is then compared with the ratio of the spectrum width to the root-mean-square deviation of frequency, and the type of modulation of the received signal is determined by the criteria proposed.

EFFECT: expanded functional capabilities.

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