ADJUSTABLE INDUCTANCE COIL ON ANNULAR CORE Russian patent published in 2004 - IPC

FIELD: electrical engineering.

SUBSTANCE: proposed inductance coil that can be used for oscillatory circuits of various devices, preselectors of high-selectivity and high-linearity radio receivers has winding and annular magnetic core. Turn number of winding disposed on end of jumper inserted between diametrically opposite sections of core is smaller than that of winding part disposed on other end of jumper. So this turn number ratio is lower than unity and complies with desired extension of adjustment range. Part of winding with smaller turn number is wound of wire having smaller diameter than that of other winding part or it is made of parallel-connected wires uniformly filling entire side of core that mounts it.

EFFECT: facilitated adjustment of inductance and linear distortion reduction.

1 cl, 3 dwg