AM noise of millimeter-wave Gunn oscillators

AM noise of a waveguide cavity Gunn oscillator operating around 33.0 GHz has been measured for frequency off carrier extending from 10 kHz to 1.5 MHz. The measurements indicate that AM noise, (N/C) AM, DSB is typically -165 dB/Hz, at frequencies sufficiently away from the carrier where contribution due to 1/f noise becomes small.