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The '''Tektronix WM490''' is a series of waveguide mixers for 490-series spectrum analyzers, e.g., the [[7L18]], [[492]], and [[494]]. | The '''Tektronix WM490''' is a series of waveguide mixers for 490-series spectrum analyzers, e.g., the [[7L18]], [[492]], and [[494]]. | ||
A waveguide is a structure which guides energy waves, such as electromagnetic waves or sound waves. Waveguides are metallic lines, similar in fashion to transmission lines, which are used at microwave frequencies. | |||
As described in "Spectrum Analysis Utilizing Waveguide Mixers" application note [[media:26W-5390.pdf|26W5390]] states that whether a measurement is made at audio frequencies or millimeter wavelengths, the spectrum analyzer is used to measure amplitude vs. frequency. Typical measurements include spectral energy distribution or signature of the energy source. This can be as simple as measuring harmonic levels of a continuous wave source to a more complicated occupied bandwidth measurement of a digital microwave transmission system. | As described in "Spectrum Analysis Utilizing Waveguide Mixers" application note [[media:26W-5390.pdf|26W5390]] states that whether a measurement is made at audio frequencies or millimeter wavelengths, the spectrum analyzer is used to measure amplitude vs. frequency. Typical measurements include spectral energy distribution or signature of the energy source. This can be as simple as measuring harmonic levels of a continuous wave source to a more complicated occupied bandwidth measurement of a digital microwave transmission system. | ||