1. A device, comprising: a. a radio receiver that receives radio frequency signals and includes an analog demodulator that demodulates the radio frequency signals; b. a processor coupled to the radio receiver that: i. computes a digital frequency transform for each sample of a time-based output of the analog demodulator; ii. analyzes the digital frequency transform to identify image frequency candidates; and iii. removes an image frequency candidate if it actually is an image, otherwise, not removing the image frequency candidate.