GB524073A - Improvements in radio circuit arrangements employing potential-variable capacity devices - Google Patents
Improvements in radio circuit arrangements employing potential-variable capacity devicesInfo
- Publication number
- GB524073A GB524073A GB604740A GB604740A GB524073A GB 524073 A GB524073 A GB 524073A GB 604740 A GB604740 A GB 604740A GB 604740 A GB604740 A GB 604740A GB 524073 A GB524073 A GB 524073A
- Authority
- GB
- United Kingdom
- Prior art keywords
- group
- potential
- contacts
- variable capacity
- radio circuit
- 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
Landscapes
- Selective Calling Equipment (AREA)
Abstract
524,073. Automatic frequency control system. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., RUST, N. M., BRAILSFORD, J. D., OLIVER, A. L., and RAMSEY, J. F. Nov. 12, 1938, No. 6047/40. Divided out of 522,476 [Group XXXVI]. [Class 38 (iv)] [Also in Group XL] The oscillator frequency in a superheterodyne receiver is controlled by a potential variable condenser which may be of the kind described in Specifications 522,476 and 522,564, [both in Group XXXVI]. The control may be derived from a discriminator circuit and applied to a potential variable condenser connected across a part of the local oscillator tuning inductance, Fig. 2 (not shown). A polarizing voltage may be superinposed on the controlling voltage. The Figure shows the application to a remote controlled receiver in which a pair of contacts CO are provided and associated with the usually provided latching bar used with push-button tuning. The contacts CO are arranged to short circuit momentarily the potential condenser C to ensure that the polarizing voltage is always built up from zero to avoid hysteresis effect. Reference has been directed by the Comptroller to Specification 501,238, [Group XL].
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB604740A GB524073A (en) | 1938-11-12 | 1938-11-12 | Improvements in radio circuit arrangements employing potential-variable capacity devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB604740A GB524073A (en) | 1938-11-12 | 1938-11-12 | Improvements in radio circuit arrangements employing potential-variable capacity devices |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB524073A true GB524073A (en) | 1940-07-29 |
Family
ID=9807440
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB604740A Expired GB524073A (en) | 1938-11-12 | 1938-11-12 | Improvements in radio circuit arrangements employing potential-variable capacity devices |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB524073A (en) |
-
1938
- 1938-11-12 GB GB604740A patent/GB524073A/en not_active Expired
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