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|discontinued=1990 | |discontinued=1990 | ||
|manuals= | |manuals= | ||
* [[Media:062-4566-00.pdf|High Performance Waveguide Mixers for the 492 and 7L18]] | * [[Media:062-4566-00.pdf|High Performance Waveguide Mixers for the 492 and 7L18]] | ||
* [[Media: 070-3731-01.pdf | 070-3731-01 WM490 Instruction Manual]] (OCR) | * [[Media: 070-3731-01.pdf | 070-3731-01 WM490 Instruction Manual]] (OCR) | ||
* [[Media:Tek_WM490_Catalog_Spec_1982.pdf| Tektronix WM490 Introduction Spec]] | * [[Media:Tek_WM490_Catalog_Spec_1982.pdf| Tektronix WM490 Introduction Spec]] |