Wobbulator or Sweep Generator

A wobbulator or sweep generator is a special type of signal generator. It provides the signals simultaneously. One signal is a frequency modulated RF output. The other signal is a duplicate of or is synchronized by the audio voltage which is used to frequency modulate the RF signal. This audio output may be either a sinusoidal or a sawtooth voltage. In practice, the audio voltage is applied to the horizontal deflection system of an oscilloscope while the frequency modulated RF output is applied to the input of an IF or RF amplifier. The rectified output of the amplifier is then applied to the vertical deflection system of the oscilloscope. The resulting oscilloscope pattern shows the frequency response of the amplifier and provides the best possible indication for aligning the amplifier's tuned circuits.

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