I am looking for any bit of info concerning the AN/UPX-7 IFF interrogator. It was composed of RT-198 receiver-transmitter, C-774 control box and AS-133 antenna. It looked like the well known APX-6, but was an interrogator, not a transponder. Schematics and manual welcome, but also actual equipment. Thanks! Ugo Fermi IW1FQG Torino, Italy