A high frequency signal source module includes a housing have a high-Q dielectric puck and a transition enclosure employing an antipodal finline transition. A circuit module connected to the high-Q puck includes an oscillator circuit that cooperates with the high-Q puck, and a frequency doubling circuit. In turn, the output of the frequency doubler is coupled to the antipodal finline transition, and thence to the output standard rectangular waveguide.