Injection-locked avalanche diode oscillator FM receiver

An injection-locked-oscillator FM receiver has been built in X-band waveguide using an avalanche diode oscillator. Measurements of the output voltage as a function of peak frequency deviation of the input signal were made and compared with theoretical values. Good agreement between theoretical and measured performance indicates that the avalanche diode is adequately described by the van der Pol model and that linear broad-band performance can be expected of the receiver.