5895-00-057-1902 (342C181H01)
NSN 5895-00-057-1902 (NIIN 00-057-1902) is a tuned cavity in Federal Supply Class 5895, Miscellaneous Communication Equipment — an inclosure, with a conductive inner wall, whose resonant frequency is determined by its internal dimensions. Manufacturer part number 342C181H01 (Westinghouse Electric Corp, CAGE 79500); also referenced as 140S (Lexan Industries, Inc).
Key specs: copper alloy body; 3.16 to 3.36 MHz frequency; full characteristics table below. NIIN assigned January 1961; export Schedule B 9030.90.8040.