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The axion, a hypothetical particle originally introduced to solve the strong CP problem, is considered a favored dark matter candidate. In the RF range, the most well-developed detector so far is the axion haloscope, a device consisting of a magnet, a microwave cavity, an amplifier, and an RF receiver. This device relies on the two-photon coupling that converts an axion into a single photon under a strong magnetic field. The converted photons are resonantly amplified inside the cavity, and the RF antenna extracts the signal to the receiver. Commonly, the TM010 mode of a cylindrical cavity is widely used for resonant amplification, as it provides the strongest phase matching and maximizes the conversion power. However, recent studies suggest that using two modes, rather than a single mode, may enhance the experimental efficiency via a heterodyne approach. In this method, a strong RF tone is injected into one of the modes instead of applying a magnetic field. When the frequency of the other mode matches the sum or difference of the input tone and the axion mass frequency, that mode is excited and can be detected through the receiver. In this talk, the effects and the validity of this up/down conversion scheme is discussed.