Patent US4823099A successfully refreshed from Google Patents.
US4823099A
Expired / Lapsed
US
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Television tuner for three different frequency ranges
Assignee: Telefunken Electronic GmbH
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Filing: 1987-10-01
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Granted: 1989-04-18
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Expires: 2007-10-01
Abstract
Abstract A television tuner for three different frequency ranges comprises a common antenna connection for three input filter circuits (1, 2, 3). In order to obtain a simple circuit design which involves negligible mutual capacitive loads from the input filter circuits (1, 2, 3), the antenna connection (4) is spatially associated with the input filter circuit (3) for the highest frequency range and is directly connected to one end of a coupling conductor (5). The coupling conductor (5) is series-connected directly with the connection for input filter circuit (1) of the lowest frequency range I and, via a switching diode (11), with the input filter circuit (2) for the medium frequency range II. A further switch (12) detunes the input filter circuit (3) for the highest frequency range III if one of the other input filter circuits (1, 2) is activated.
Inventors
- 👤 Emil Leipert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:54
CPC Classifications
H; H03; H03J; H03J5/00; H03J5/24; H03J5/242; H03J5/244
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
170 words
In a television tuner for three different frequency ranges including a common antenna connection to which three corresponding input filter circuits are connected, with each of these input filter circuits being followed by a respective amplifier circuit, with always only that one of the amplifier circuits which is associated with the frequency range to be received being activated; the improvement wherein: the antenna connection is spatially disposed in proximity of the input filter circuit for the highest frequency range, and is directly connected to one end of a coupling conductor which is coupled with an input circuit coil of the input filter circuit for the highest frequency range; the other end of said coupling conductor is directly connected to a coupling coil of the lowest frequency range input filter circuit and, via a switch, to a coupling coil of the input filter circuit associated with the medium frequency range; and a further switch is connected to a frequency determining element of the input filter circuit for the highest frequency range.
Claim 2
Dependent Claim
170 words
In a television tuner for three different frequency ranges including a common antenna connection to which three corresponding input filter circuits are connected, with each of these input filter circuits being followed by a respective amplifier circuit, with always only that one of the amplifier circuits which is associated with the frequency range to be received being activated; the improvement wherein: the antenna connection is spatially disposed in proximity of the input filter circuit for the highest frequency range, and is directly connected to one end of a coupling conductor which is coupled with an input circuit coil of the input filter circuit for the highest frequency range; the other end of said coupling conductor is directly connected to a coupling coil of the lowest frequency range input filter circuit and, via a switch, to a coupling coil of the input filter circuit associated with the medium frequency range; and a further switch is connected to a frequency determining element of the input filter circuit for the highest frequency range.
Claim 3
Dependent Claim
58 words
Television tuner according to claim 1, wherein said other end of the coupling conductor is connected, via a coupling capacitor, to the input circuit coil of the input filter circuit for the highest frequency range, and a further capacitor is connected from said input circuit coil of the input filter circuit for the highest frequency range to ground.
Claim 4
Dependent Claim
45 words
Television tuner according to claim 1, wherein said three input filter circuits are arranged in separate chambers of a common housing, and the chamber for the lowest frequency range input filter circuit is arranged between the chambers for the higher frequency range input filter circuits.
Claim 5
Dependent Claim
27 words
Television tuner according to claim 1, wherein the further switch is connected in series with a capacitor and with an alignment coil parallel to a tuning diode.
Claim 6
Dependent Claim
58 words
Television tuner according to claim 2, wherein said other end of the coupling conductor is connected, via a coupling capacitor, to the input circuit coil of the input filter circuit for the highest frequency range, and a further capacitor is connected from said input circuit coil of the input filter circuit for the highest frequency range to ground.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-04-17 | 1992-10-17 | 1993-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-17 | 1996-10-17 | 1997-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-17 | 2000-10-17 | 2001-04-18 | $7700.00 | Window Closed / Lapsed |