US3705356A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Aft system for signal receiver of type having tuner employing varactor diode
Assignee: Electrohome Ltd
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Filing: 1970-10-05
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Granted: 1972-12-05
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Expires: 1990-10-05
Abstract
Abstract A signal receiver of a type including an AFT network providing an AFT signal and also of a type employing a varactor tuner and a plurality of channel selecting networks for selecting different channels to which the receiver may be tuned has a source of D.C. potential for the channel selecting networks that is regulated by a voltage regulator to which the AFT signal is supplied to change the voltage regulated by the voltage regulator.
Inventors
- 👤 William G Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:17
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/20; H03G3/30; H03G3/3052; H03J; H03J3/00; H03J3/02; H03J3/16; H03J3/18; H03J3/185; H03J5/00; H03J5/02; H03J5/0218; H03J7/00; H03J7/02; H03J7/04; H03J7/08; H03J7/12
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
209 words
In combination with a signal receiver of a type including AFT network means providing an AFT signal at an AFT signal input terminal, a tuner of a type employing the voltage variable capacitance characteristic of a voltage variable capacitance diode for varying the tuning of said receiver and a plurality of channel selecting networks for selecting different channels to which said receiver may be tuned and applying different voltages to said diode to change the tuning of said receiver; a source of D.C. potential for said channel selecting networks connected to vary said different voltages in response to changes in said D.C. potential, a voltage regulator connected in circuit with said source of D.C. potential for regulating said D.C. potential, said voltage regulator having an input terminal to which said AFT signal is supplied and being of a type that maintains said D.C. potential constant when said AFT signal is constant and varies the D.C. potential regulated thereby in response to any change in said AFT signal, and means connecting said AFT signal input terminal and said voltage regulator for supplying said AFT signal to said voltage regulator to vary the magnitude of said D.C. potential regulated by said voltage regulator in response to changes in said AFT signal.
Claim 2
Dependent Claim
209 words
In combination with a signal receiver of a type including AFT network means providing an AFT signal at an AFT signal input terminal, a tuner of a type employing the voltage variable capacitance characteristic of a voltage variable capacitance diode for varying the tuning of said receiver and a plurality of channel selecting networks for selecting different channels to which said receiver may be tuned and applying different voltages to said diode to change the tuning of said receiver; a source of D.C. potential for said channel selecting networks connected to vary said different voltages in response to changes in said D.C. potential, a voltage regulator connected in circuit with said source of D.C. potential for regulating said D.C. potential, said voltage regulator having an input terminal to which said AFT signal is supplied and being of a type that maintains said D.C. potential constant when said AFT signal is constant and varies the D.C. potential regulated thereby in response to any change in said AFT signal, and means connecting said AFT signal input terminal and said voltage regulator for supplying said AFT signal to said voltage regulator to vary the magnitude of said D.C. potential regulated by said voltage regulator in response to changes in said AFT signal.
Claim 3
Dependent Claim
50 words
The invention according to claim 1 including an AFT converter network having a high impedance input and a low impedance output and connected between said AFT signal input terminal and said voltage regulator for changing said AFT signal from a high impedance source signal to a lower impedance source signal.
Claim 4
Dependent Claim
82 words
The invention according to claim 1 including variable resistance means connected between said source of D.C. potential and a terminal at a different D.C. potential than the D.C. potential of said source and switching means for selectively connecting said variable resistance means and said AFT signal input terminal to said voltage regulator, whereby manual fine tuning accompanied by changes in the magnitude of said D.C. potential regulated by said voltage regulator are achieved by varying the resistance of said variable resistance means.
Claim 5
Dependent Claim
64 words
The invention according to claim 3 including means responsive to said switching means connecting said variable resistance means to said voltage regulator for supplying a D.C. signal to said AFT signal input terminal that is within the pull-in range of said AFT network means, and a storage capacitor connected to said AFT signal input terminal and adapted to be charged by said D.C. signal.
Claim 6
Dependent Claim
50 words
The invention according to claim 4 including an AFT converter network having a high impedance input and a low impedance output and connected between said AFT signal input terminal and said voltage regulator for changing said AFT signal from a high impedance source signal to a lower impedance source signal.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |