A square black metal housing enclosing a transformer, two contacts on front and two on back. Stamped on back: “Type 271 / M.F. Transformer / G. Sec”; on front: “General Radio Co. / Cambridge, Mass. / ...

Amateur radio is the only hobby that offers its licensed operators the chance to legally design, build, and operate high power radio transceivers connected to unlimited antenna arrays for the purpose ...

A radio-frequency transformer of continuously-variable ratio has been developed; it has been designed primarily for use in admittance bridges and is particularly ...