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{{Instrument Sidebar |
{{Instrument Sidebar
|class=Spectrum Analyzer
|class=Accessory
|manufacturer=Tektronix  
|manufacturer=Tektronix  
|model=WM782 |
|model=WM782
summary=Waveguide Mixer |
|summary=waveguide mixer
image=Tek_WM782A_1.jpg |
|image=Tek_WM782A_1.jpg
caption=Tektronix WM782 |
|caption=Tektronix WM782 |
introduced=1989 |
|introduced=1989 |
discontinued=1997 |
|discontinued=1997
manuals=
|manuals=
Need Instruction Manual and more photos
* [[Media:Tek_WM782_Catalog_Spec_1990.pdf| Tektronix WM782 Introduction Spec]]
* [[Media:Tek_WM782_Catalog_Spec_1990.pdf| Tektronix WM782 Introduction Spec (PDF)]]
* [[Media:Tek_WM782_Catalog_Spec_1996.pdf| Tektronix WM782 Final Spec]]
* [[Media:Tek_WM782_Catalog_Spec_1996.pdf| Tektronix WM782 Final Spec (PDF)]]
* ''Instruction Manual needed'' [[Category:Manual needed]]
}}
}}
The '''Tektronix WM782''' is a series of waveguide mixers for 2780-series spectrum analyzers, e.g., the [[2782]], and [[2784]].   
The '''Tektronix WM782''' is a series of waveguide mixers for 2780-series spectrum analyzers, e.g., the [[2782]], and [[2784]].   
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.  Unlike coaxial cable which is also a transmission line, there is no center conductor within the waveguide. Signals propagate within the confines of the metallic walls that act as boundaries. The signal propagation is confined by total internal reflection from the walls of the waveguide.
As described in "Spectrum Analysis Utilizing Waveguide Mixers" the Tektronix 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.


Actual spectrum analyzer measurements at millimeter wavelengths differ from lower frequency measurements in the transition from coaxial cables to waveguides.  Most spectrum analyzers have an internal mixer upper frequency limit of 21 to 22 GHz, and utilize a type "N" RF input connector.
Actual spectrum analyzer measurements at millimeter wavelengths differ from lower frequency measurements in the transition from coaxial cables to waveguides.  Most spectrum analyzers have an internal mixer upper frequency limit of 21 to 22 GHz, and utilize a type "N" RF input connector.
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When the requirement measurement is above 22 GHz, some type of external mixing is required.  Current techniques utilize harmonics of the spectrum analyzer first sweeping LO and an external harmonic waveguide mixer covering the designer frequency range.  The mixers extend the frequency range of measurement up to as high as 325 GHz.  Each mixer covers a separate frequency range, typically about two thirds of an octave.
When the requirement measurement is above 22 GHz, some type of external mixing is required.  Current techniques utilize harmonics of the spectrum analyzer first sweeping LO and an external harmonic waveguide mixer covering the designer frequency range.  The mixers extend the frequency range of measurement up to as high as 325 GHz.  Each mixer covers a separate frequency range, typically about two thirds of an octave.


Note: The [[media:MIL-DTL-39000C.pdf|MIL-F-39000/3C]] which describes flanges for double-ridge waveguide was cancelled without replacement on January 20, 2009.
Note: The [[media:MIL-DTL-39000C.pdf|MIL-F-39000/3C]], which describes flanges for double-ridge waveguides, was cancelled without replacement on January 20, 2009.


{| class="wikitable center"
{| class="wikitable center"
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==Links==
==Links==
* [[Media:26W-5390.pdf | Spectrum Analysis Utilizing Waveguide Mixers (PDF)]]
* [[Media:26W-5390.pdf | Spectrum Analysis Utilizing Waveguide Mixers]]
* [http://www.nitehawk.com/k6jey/harmonic_mixers.pptx Harmonic Mixers for Spectrum Analyzers y K6JEY]
* [http://www.nitehawk.com/k6jey/harmonic_mixers.pptx Harmonic Mixers for Spectrum Analyzers y K6JEY]
* [[Media:VOL_10_Waveguide_Handbook.pdf | M.I.T. Radiation Laboratory Series, Waveguide Handbook, N. Marcuvitz, 1951 (PDF)]]
* [[Media:VOL_10_Waveguide_Handbook.pdf | M.I.T. Radiation Laboratory Series, Waveguide Handbook, N. Marcuvitz, 1951]]
* [https://en.wikipedia.org/wiki/Waveguide_(electromagnetism)#Waveguide_in_practice Waveguide (electromagnetism)]
* [https://en.wikipedia.org/wiki/Waveguide_(electromagnetism)#Waveguide_in_practice Waveguide (electromagnetism)]
* [https://en.wikipedia.org/wiki/Waveguide_flange Waveguide flange]
* [https://en.wikipedia.org/wiki/Waveguide_flange Waveguide flange]
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[[Category:Mixers]]
[[Category:Mixers]]
[[Category:Manual needed]]
Retrieved from "https://w140.com/tekwiki/wiki/Special:MobileDiff/92314"

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