Patent ID: 6980611

Claim:
A system for measuring RF emissions radiated from an electronic device, comprising: a first RF sensor for receiving the RF emissions radiated from the electronic device at a specified first distance and a plurality of RF ambient signals emitted from local transmission sources; a first RF receiver in electrical communication with the first RF sensor, the first Rf receiver being operative to demodulate and digitize output of the first RF sensor; a second RF sensor positioned away from the electronic device by a second distance large enough to receive the radiated RF emissions with a power level at least 20 dB lower than that received by the first RF sensor, so as to primarily receive the RF ambient signals; a second RF receiver in electrical communication with the second RF sensor, the second RF receiver being operative to demodulate and digitize output of the second RF sensor, the second RF receiver being synchronized with the first RF receiver; a signal processing system in electrical communication with the first and second RF receivers, the signal processing system being operative to determine an amount of the RF emission radiated from the electronic device at the first distance by scaling and subtracting output of the second RF receiver from out of the first RF receiver.