A tone generator, also called a signal generator in some applications, is an electronic device that artificially creates sounds frequencies -- usually, but not always by a primarily electrical means.
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Credit: https://sciencing.com/tone-generators-work-12048674.html
Pasternack coaxial RF noise sources (also known as noise generators) are diode-based microwave components that produce white noise for system performance evaluation such as noise figure. RF noise sources / noise generators from Pasternack are commonly used in production and lab test environments.
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Credit: https://www.google.ca
A comb generator is simply a device that will produce a set of harmonically related CW signals whose spacing is based on a fundamental oscillator frequency. For example, if we were to start with a 10 MHz clock oscillator and feed the digital output into a coax connector, we’d produce a series of CW higher-order harmonics spaced every 10 MHz apart.
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Credit: https://interferencetechnology.com/harmonic-comb-generators-are-useful-tools/
