need info about the Stoddart vhf/uhf "field intensity meter." I believe it was in service during the 1950'S /60'S. It has 50 ohm video outputs for FM, AM Log, and AM Lin; also "hi z" X-axis, and 50 ohm IF output. NAVSHIPS 91255 might include the R533R-3 receiver. Anybody know of a source for this manual?