A wobbulator is an electronic device primarily used for the alignment of receiver or transmitter intermediate frequency strips. It is usually used in conjunction with an oscilloscope, to enable a visual representation of a receivers passband to be seen, hence, simplifying alignment; it was used to tune early consumer AM radios. The term ‘wobbulator’ is a portmanteau of wobble and oscillator. A ‘wobbulator’ (without capitalization) is a generic term a frequency-modulated RF oscillator, also called a ‘sweep generator.’
A wobulator was used in some old microwave signal generators to create what amounted to frequency modulation. When capitalized ‘Wobbulator’ refers to the trade name of a specific brand of RF/IF alignment generator. The Wobbulator was made by a company known as TIC (Tel-Instrument Company). The Wobbulator generator, designated model 1200A, when connected to an oscilloscope and television receiver under test, would display a representation of the receiver’s RF/IF response curves with ‘markers’ defining critical frequency reference points as a response curve on the oscilloscope screen. Such an amplitude-versus-frequency graph is also often referred to as a Bode (pronounced ‘bodee’) plot.
The Daily Omnivore 
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