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| Number | Title | Issue Date |
| 7088984 | Electronic tuner An electronic tuner of the present invention is arranged such that between an input part of the amplifying circuit and the ground serially connected are a coil and a diode, and a capacitor is connected between the ground and a connecting part between the coil and th... | 08/08/2006 |
| 5412310 | Switchable inductor for strong currents Switchable inductors for strong currents are used especially in antenna tuning circuits. The value of the inductance between the terminals of the primary winding of an air-core static transformer is different depending on whether the secondary winding of ... | 05/02/1995 |
| 5300904 | Circuit arrangement for the tank circuit of a high-frequency transmitter output stage operated with frequency shift keying The invention concerns a circuit for the resonant cavity in a frequency-shift HF transmitter output stage, with a first capacitance (2), a first inductance (3) and a first switch (5) for feeding the HF signal to the resonant cavity. To switch the resonant... | 04/05/1994 |
| 4831661 | RF tuning circuit A RF tuning circuit according to this invention is composed of one tuned transformer (T1) at least and an untuned transformer (T2) so interconnected that the outputs from the respective transformers add up opposite in phase on that s... | 05/16/1989 |
| 3943471 | Digital tuning device A digital tuning device for accurate selectable tuning of a resonant circuit. The inductive and capacitive elements of the resonant circuit are connected by a transformer device whose turns ratio is variable in accurate digital increments. Since the refle... | 03/09/1976 |
