GB445350A - Automatic tuning for radio receivers - Google Patents
Automatic tuning for radio receiversInfo
- Publication number
- GB445350A GB445350A GB2849734A GB2849734A GB445350A GB 445350 A GB445350 A GB 445350A GB 2849734 A GB2849734 A GB 2849734A GB 2849734 A GB2849734 A GB 2849734A GB 445350 A GB445350 A GB 445350A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- oscillator
- rectified
- receiver
- pulses
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
- H03J7/02—Automatic frequency control
- H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
- H03J7/047—Automatic frequency control using an auxiliary signal, e.g. low frequency scanning of the locking range or superimposing a special signal on the input signal
Landscapes
- Developing Agents For Electrophotography (AREA)
Abstract
445,350. Valve circuits for wireless reception. COLE, Ltd., E. K., Priory Crescent, Southend-on-Sea, and BRADFIELD, G., 34, St. Benets Road, Prittlewell, Essex. Oct. 5, 1934, No. 28497. [Class 40 (v)] A radio receiver is automatically brought into exact tune with a desired signal by deriving from the receiver a control current whose magnitude depends on departure from exact tune and combining therewith separately generated low frequency oscillations, the rectified resultant being applied to a grid of a valve constituting or associated with the local oscillator of the receiver. In the Figure, V1 is an I.F. amplifier, V2 the local oscillator, V3 the mixing valve, and D1 the signal rectifier of a superheterodyne receiver. A further diode D2 provides a rectified voltage which increases as exact tuning is approached, this voltage being applied to the primary 4 of a transformer, audio frequency variations are byepassed by condenser C. Low (sub-audible) frequency oscillations, generated for example by a neon tube-condenser combination (Fig. 2, not shown), are applied at 7 to the secondary of 4 and are rectified by rectifiers 5, 6, producing pulsating potentials on the grid of V2 over resistance 8. The resulting pulses rectified by D2 aid or oppose the pulses from 7 in circuit 4, 5, 6 ; when the pulses aid, the change of frequency of V2 is cumulative towards the in-tune position ; when they oppose, there is no substantial change in frequency. The normal frequency of the oscillator V2 is arranged to be slightly displaced from the true required oscillator frequency. In a modification, a hexode frequency changer is employed, the oscillator frequency being varied by a thermionic valve acting as a shunt capacity across the oscillator circuit, Fig. 3 (not shown). Reference has been directed by the Comptroller to Specification 437,442.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2849734A GB445350A (en) | 1934-10-05 | 1934-10-05 | Automatic tuning for radio receivers |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB2849734A GB445350A (en) | 1934-10-05 | 1934-10-05 | Automatic tuning for radio receivers |
Publications (1)
Publication Number | Publication Date |
---|---|
GB445350A true GB445350A (en) | 1936-04-06 |
Family
ID=10276568
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB2849734A Expired GB445350A (en) | 1934-10-05 | 1934-10-05 | Automatic tuning for radio receivers |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB445350A (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2501368A (en) * | 1944-03-25 | 1950-03-21 | Emi Ltd | Frequency stabilized relay for frequency-modulated oscillations |
US2627024A (en) * | 1944-04-21 | 1953-01-27 | Jr Persa R Bell | Automatic frequency control |
US2681414A (en) * | 1946-02-01 | 1954-06-15 | Us Navy | Automatic frequency control circuit |
-
1934
- 1934-10-05 GB GB2849734A patent/GB445350A/en not_active Expired
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2501368A (en) * | 1944-03-25 | 1950-03-21 | Emi Ltd | Frequency stabilized relay for frequency-modulated oscillations |
US2627024A (en) * | 1944-04-21 | 1953-01-27 | Jr Persa R Bell | Automatic frequency control |
US2681414A (en) * | 1946-02-01 | 1954-06-15 | Us Navy | Automatic frequency control circuit |
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