| 摘要 |
FIELD: electrical engineering. ^ SUBSTANCE: invention relates to electrical engineering and can be used for discrete variation of inductance in high AC circuits, in particular antenna circuits of high-power transmitter output stages connected to high-Q antennas of ULR-LW ranges in transmitting wide-band signals with phase and frequency modulation. Proposed device comprises switched inductor coil, conversion transformer and electronic transistorised key. Extra inductor coil represents a primary of said conversion transformer, while switched inductor coil makes functionally isolated element connected directly in switched circuit. Aforesaid electronic key is connected, via power switched electrodes, to conversion transformer secondary terminals. Said secondary represents a conductor of cavity coil with central point. Solid state diodes are connected to secondary extreme terminals, diodes other outputs being integrated. Power switched electrodes of switched transistorised electronic key are connected in between said diodes and central terminal of secondary. ^ EFFECT: higher efficiency, retuning of antenna circuits without distortion of radiated signal shape. ^ 4 cl, 1 dwg |
