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{{Oscilloscope Sidebar |
{{Instrument Sidebar
title=Tektronix WM782 |
|class=Accessory
summary=Waveguide Mixer |
|manufacturer=Tektronix  
image=Tek_WM782A_1.jpg |
|model=WM782
caption=Tektronix WM782 |
|summary=Waveguide mixer
introduced=1989 |
|image=Tek_WM782A_1.jpg
discontinued=1997 |
|caption=Tektronix WM782 |
manuals=
|introduced=1989 |
Need Instruction Manual and more photos
|discontinued=1997
* [[Media:Tek_WM782_Catalog_Spec_1990.pdf| Tektronix WM782 Introduction Spec (PDF)]]
|manuals=
* [[Media:Tek_WM782_Catalog_Spec_1996.pdf| Tektronix WM782 Final Spec (PDF)]]
* [[Media:Tek_WM782_Catalog_Spec_1990.pdf| Tektronix WM782 Introduction Spec]]
* [[Media:Tek_WM782_Catalog_Spec_1996.pdf| Tektronix WM782 Final Spec]]
* ''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.


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.


{| class="wikitable center"
{| class="wikitable center"
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Notes:
Notes:
* All mixers are equipped with standard UG-XXX/U type flanges.  MIL-F-3022 type flanges are available in F, D, and G bands.
* All mixers are equipped with standard UG-XXX/U type flanges.  MIL-F-3022 type flanges are available in F, D, and G bands.
* The waveguide name WR stands for waveguide rectangular, and the number is the inner long dimension width of the waveguide in hundredths of an inch (0.01 inch = 0.254 mm) rounded to the nearest hundredth of an inch.
* The waveguide name WR stands for waveguide rectangular, and the number is the inner long dimension width of the waveguide in hundredths of an inch (0.01 inch = 0.254 mm) rounded to the nearest hundredth of an inch. Waveguide height is half the waveguide width.
* The waveguide height is half the waveguide width.
* The Electronic Industries Alliance (EIA) is the body that defined the WR designations for standard rectangular waveguides.
* The Electronic Industries Alliance (EIA) is the body that defined the WR designations for standard rectangular waveguides.
* [[media:MIL-DTL-39000C.pdf|MIL-F-39000/3C]], which describes flanges for double-ridge waveguides, was cancelled without replacement on January 20, 2009.


==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]]

Latest revision as of 03:11, 2 April 2024

Tektronix WM782
Waveguide mixer
Tektronix WM782

Produced from 1989 to 1997

Manuals
(All manuals in PDF format unless noted otherwise)
Manuals – Specifications – Links – Pictures

The Tektronix WM782 is a series of waveguide mixers for 2780-series spectrum analyzers, e.g., the 2782, and 2784.

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.

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.

Characteristics
Model No. Band Desig. Freq Range (GHz) Sensitivity
(dBm) 		Waveguide (EIA) U-Type Flanges
WM782A A 26 to 40 -115 WR-28 UG-599/U
WM782Q Q 33 to 50 -115 WR-22 UG-383/U-M
WM782U U 40 to 60 -115 WR-19 UG-383/U-M
WM782V V 50 to 75 -110 WR-15 UG-385/U
WM782E E 60 to 90 -105 WR-12 UG-387/U
WM782W W 75 to 110 -105 WR-10 UG-387/U-M
WM782F F 90 to 140 -95 WR-08 UG-387/U-M
WM782D D 110 to 170 -90 WR-06 UG-387/U-M
WM782G G 140 to 220 -85 WR-05 UG-387/U-M
WM782J J 220 to 325 -75 WR-03 (?)

Notes:

  • All mixers are equipped with standard UG-XXX/U type flanges. MIL-F-3022 type flanges are available in F, D, and G bands.
  • The waveguide name WR stands for waveguide rectangular, and the number is the inner long dimension width of the waveguide in hundredths of an inch (0.01 inch = 0.254 mm) rounded to the nearest hundredth of an inch. Waveguide height is half the waveguide width.
  • The Electronic Industries Alliance (EIA) is the body that defined the WR designations for standard rectangular waveguides.
  • MIL-F-39000/3C, which describes flanges for double-ridge waveguides, was cancelled without replacement on January 20, 2009.

Links

Pictures

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