Abstract: A method for searching a spur in a signal received is described, wherein a fast sweep measurement with a high resolution bandwidth is performed in order to detect at least one spur. Further, a detailed sweep measurement with narrow resolution bandwidth is performed in order to analyze said spur detected. Said narrow resolution bandwidth needed for said detailed sweep measurement of said spur is determined automatically. Further, a device for searching a spur in a signal received is described.

Abstract: Modulated differential (balanced) drive signals are created where, at least one of the signals can be controlled in phase relative to the other, and both of which could be controlled in amplitude and both of which have the same modulation envelope. In one embodiment, a coherent signal is generated in a first electronic signal generator (ESG) and applied to a second ESG. The coherent signal replaces the normal input signal of the second ESG and the I and Q inputs of the second ESG control the amplitude and phase of the output signal. This output signal is applied to a third ESG replacing the normal input signal to the vector modulator.