(under subclass 71) Subject matter wherein the frequency of the tuned circuit is varied by moving a core of material in the magnetic or the electric and magnetic field of an inductor element.
(1) Note. The core of material used to tune the tuned circuit is not restricted to any particular shape but may be of any desired configuration.
SEE OR SEARCH THIS CLASS, SUBCLASS:
70, for core tuned inductors in which both the capacitance and inductance of the tuned circuit are simultaneously varied.
SEE OR SEARCH CLASS
330, Amplifiers,
169, for amplifiers having transformer coupling including means for adjusting inductive coupling of transformer. 336, Inductor Devices,
117+, and 130+ for inductors having a relatively movable core and coil.
343, Communications: Radio Wave Antennas,
748, for loop type antennae with a variable reactance (e.g., adjustable core) for tuning the antenna.
