[Milsurplus] Another IFF question

[FERMI Ugo (FGA)]

Any information available about the AN/UPX-7?
I only know that it was an IFF interrogator derived from the famous APX-6 transpondor.
The R/T unit, called RT-198/UPX-7, was part of APX-28 and APX-29 interrogators as well.
I need the manual for the UPX-7 (or, at least, the schematic dwg).

Thanks!
Ugo Fermi IW1FQG, Torino, Italy