Tektronix Spectrum Analyzer Mixer Marki Microwave M06210 RSA6120A RSA6120B 6114A
This unit is a custom Marki Microwave Double Balanced Mixer, used in the RF deck of the Tektronix RSA6000 and/or RSA5000 series Spectrum Analyzers from Tektronix. The part number is M06210 but since it is custom there is no publicly available datasheet.