Title: Radar RF generator including a stable local oscillator and an exciter circuit

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Abstract: The specification discloses a RF generator for use in a radar system. The generator includes an oscillator having a crystal for generating a predetermined VHF signal. A multiplier multiplies the VHF signal to a desired RF signal. Amplifying circuitry amplifies the RF signal and applies a signal to a first isolator. A filter is connected to the output of the first isolator and includes plural cavaties for filtering all but a selected narrow bandwidth signal from the RF signal. A power divider divides the narrow bandwidth signal to provide a stable local oscillator signal and an exciter signal. A second isolator is connected to receive the exciter signal and a high pass filter is connected to the output of the isolator. A coherent oscillator generates a stable coherent oscillator signal and a transmit switch is provided to gate the coherent oscillator signal in response to a radar timing signal. A mixer mixes the gated coherent oscillator signal with the filtered exciter signal. A bandpass filter passes a selected one of the upper and lower side bands of the output from the mixer. An exciter amplifier is connected to amplify the output of the bandpass filter and to apply the signal through a third isolator to the radar system.


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