PMI Isolator

Andy G4JNT

One of the components recovered from the old Eaton Spec an last year is a PMI-5074 "Peripheral Mode Isolator"
It was used in the YIG LO feed to the frequency locking circuitry, and is described in the manual as a "40dB" unit.   It covers the 2-4GHz LO range.

40dB, if that's the return S12 / S22 figure is pretty good, nay, very good.   

Does anyone know what is meant by "Peripheral Mode" in this context?  T'Internet is not at-all helpful, although does tell me it has a certain intrinsic value in dollars !

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