Abstract: An interference detection assembly is disclosed for detecting interference generated from a plurality of signals received by a receiver having a single output signal, the interference detection assembly including a synchronous demodulator having an input line electrically connected to a receiver to receive the single output signal therefrom, the synchronous demodulator converting the single output signal to generate an intermediate frequency signal, the synchronous demodulator having a Q-channel output transmitting a phase of the single output signal out therefrom, and a pilot detector electrically connected to the Q-channel output to receive the phase of the output signal to detect interference.

Abstract: An AM-modulated carrier signal is converted to a lower carrier frequency through mixing with a square wave local oscillator signal. A field-effect transistor chops the modulated signal according to the square wave signal so that a chopped or sampled version of the modulated signal is created without passing the signal through a semiconductor junction. A filter then selects the desired mixing product. Thus, a distortion free mixing of the signal is obtained using low cost components including a JFET switch and a square wave output from a microcontroller.