US3715671A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple spreadband tuning in a varactor tuned radio receiver
Assignee: RCA Licensing Corp
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Filing: 1970-12-29
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Granted: 1973-02-06
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Expires: 1990-12-29
Abstract
Abstract In a radio receiver including varactors for tuning the receiver, a circuit is provided for regulating the range of voltage impressed upon the varactors, to tune the receiver to any selected one of a plurality of spreadbands. This circuit includes first, second, and third variable resistances. A first contact means simultaneously adjusts the resistance of the first and second variable resistances to vary the ratio therebetween for impressing a given range of voltage across the varactors to tune to a selected spreadband. A second contact means adjusts the third variable resistance means to impress a particular voltage, within the given range of voltage, upon the varactors to tune the receiver to a particular frequency within the selected spreadband.
Inventors
- 👤 J Worcester
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 02:26
CPC Classifications
H; H03; H03J; H03J3/00; H03J3/02; H03J3/10; H03J3/16; H03J3/18; H03J3/185
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
218 words
In a radio receiver employing varactor tuning circuitry, means for adjusting the voltage impressed upon the varactors so as to tune to a desired frequency within a selected one of a plurality of spreadbands, comprising: a. first variable resistance means including a first plurality of resistors, b. second variable resistance means including a second plurality of resistors, c. third variable resistance means, said first, second and third variable resistance means being connected in a series circuit with said third variable resistance means intermediate said first and second variable resistance means, d. means for connecting said series circuit to a D.C. power supply, e. first contact means for simultaneously adjusting the resistance of said first and second variable resistance means to vary the ratio therebetween for impressing a given range of voltage across said third variable resistance means, said first contact means including first and second ganged switches for coupling different pairs of corresponding resistors of said first and second pluralities of resistors into said series circuit, and f. second contact means for adjusting said third variable resistance means to impress a particular voltage within said given range of voltage for application to the varactors so as to tune to a particular frequency corresponding to said particular voltage, within a selected spreadband corresponding to said given range of voltage.
Claim 2
Dependent Claim
218 words
In a radio receiver employing varactor tuning circuitry, means for adjusting the voltage impressed upon the varactors so as to tune to a desired frequency within a selected one of a plurality of spreadbands, comprising: a. first variable resistance means including a first plurality of resistors, b. second variable resistance means including a second plurality of resistors, c. third variable resistance means, said first, second and third variable resistance means being connected in a series circuit with said third variable resistance means intermediate said first and second variable resistance means, d. means for connecting said series circuit to a D.C. power supply, e. first contact means for simultaneously adjusting the resistance of said first and second variable resistance means to vary the ratio therebetween for impressing a given range of voltage across said third variable resistance means, said first contact means including first and second ganged switches for coupling different pairs of corresponding resistors of said first and second pluralities of resistors into said series circuit, and f. second contact means for adjusting said third variable resistance means to impress a particular voltage within said given range of voltage for application to the varactors so as to tune to a particular frequency corresponding to said particular voltage, within a selected spreadband corresponding to said given range of voltage.
Claim 3
Dependent Claim
218 words
In a radio receiver employing varactor tuning circuitry, means for adjusting the voltage impressed upon the varactors so as to tune to a desired frequency within a selected one of a plurality of spreadbands, comprising: a. first variable resistance means including a first plurality of resistors, b. second variable resistance means including a second plurality of resistors, c. third variable resistance means, said first, second and third variable resistance means being connected in a series circuit with said third variable resistance means intermediate said first and second variable resistance means, d. means for connecting said series circuit to a D.C. power supply, e. first contact means for simultaneously adjusting the resistance of said first and second variable resistance means to vary the ratio therebetween for impressing a given range of voltage across said third variable resistance means, said first contact means including first and second ganged switches for coupling different pairs of corresponding resistors of said first and second pluralities of resistors into said series circuit, and f. second contact means for adjusting said third variable resistance means to impress a particular voltage within said given range of voltage for application to the varactors so as to tune to a particular frequency corresponding to said particular voltage, within a selected spreadband corresponding to said given range of voltage.
Claim 4
Dependent Claim
218 words
In a radio receiver employing varactor tuning circuitry, means for adjusting the voltage impressed upon the varactors so as to tune to a desired frequency within a selected one of a plurality of spreadbands, comprising: a. first variable resistance means including a first plurality of resistors, b. second variable resistance means including a second plurality of resistors, c. third variable resistance means, said first, second and third variable resistance means being connected in a series circuit with said third variable resistance means intermediate said first and second variable resistance means, d. means for connecting said series circuit to a D.C. power supply, e. first contact means for simultaneously adjusting the resistance of said first and second variable resistance means to vary the ratio therebetween for impressing a given range of voltage across said third variable resistance means, said first contact means including first and second ganged switches for coupling different pairs of corresponding resistors of said first and second pluralities of resistors into said series circuit, and f. second contact means for adjusting said third variable resistance means to impress a particular voltage within said given range of voltage for application to the varactors so as to tune to a particular frequency corresponding to said particular voltage, within a selected spreadband corresponding to said given range of voltage.
Claim 5
Dependent Claim
23 words
The combination recited in claim 1 wherein Said first and second plurality of resistors have oppositely progressing values in the direction of switching.
Claim 6
Dependent Claim
43 words
The combination recited in claim 2 wherein said third variable resistor in a potentiometer and said second contact means includes a sliding contact for varying the voltage impressed on the varactors to tune the receiver to a particular frequency within the selected spreadband.
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) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |