GB488158A - Improvements in or relating to radio and like receivers - Google Patents
Improvements in or relating to radio and like receiversInfo
- Publication number
- GB488158A GB488158A GB34143/37A GB3414337A GB488158A GB 488158 A GB488158 A GB 488158A GB 34143/37 A GB34143/37 A GB 34143/37A GB 3414337 A GB3414337 A GB 3414337A GB 488158 A GB488158 A GB 488158A
- Authority
- GB
- United Kingdom
- Prior art keywords
- input
- circuits
- voltage
- control voltage
- symmetrical
- 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
- H03J3/00—Continuous tuning
- H03J3/02—Details
- H03J3/12—Electrically-operated arrangements for indicating correct tuning
-
- 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
Abstract
488,158. Wireless receiving circuits. MARCONI'S WIRELESS TELEGRAPH CO., Ltd. Dec. 9, 1937, No. 34143. Convention date, July 11. Addition to 472,739 and 478,775. [Class 40 (v)] In a radio receiver comprising high-frequency networks from which is derived a control voltage dependent on departure from tune with the incoming signal, and employing phase-comparison methods as in the parent Specifications 472,739 and 478,775, the two voltages whose mutual phase relation is compared are applied across opposite corners of a rectifier bridge. Fig. 4 shows a two-circuit band-filter L1, C1, L2, C2, coupled by a rectifier bridge G1 ... G4 such that the input and output voltages e1, e2, are applied each between one pair of opposite corners. The errorresponsive voltage u varies in sign and magnitude with the phase relation of el to e2. The bridge may be employed with filters of the kind having a common reactive coupling member, Fig. 5 (not shown). The network may comprise only one tuned circuit, the input then being shunted by an impedance the centre point of which constitutes one terminal of the control voltage u, Figs. 7 and 8 (not shown). The control voltage may also be derived by comparing the relative phase of the voltage across a parallel circuit L1, Cl, Fig. 10, and a series impedance comprising capacity or inductance represented by L3, L4 arranged symmetrically. Alternatively a series-resonant circuit may be employed such as L, 2C, 2C of Fig. 12 ; or two seriesresonant circuits LC as shown in Fig. 14, the control voltage being taken off from the shunt impedances' Z0, Z4. It will be noted that all the circuits are symmetrical, and thus require an input voltage which is also symmetrical about a constant potential. A non-symmetrical input may be adapted for the circuits of the invention by using a hybrid coil, or by connecting the constant potential terminal of the input source to a centre tapping on an inductance shunted across the network input terminals.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH488158X | 1937-07-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB488158A true GB488158A (en) | 1938-07-01 |
Family
ID=4516527
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB34143/37A Expired GB488158A (en) | 1937-07-11 | 1937-12-09 | Improvements in or relating to radio and like receivers |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2220098A (en) |
| GB (1) | GB488158A (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3124708A (en) * | 1964-03-10 | Reinecke | ||
| US2474253A (en) * | 1943-04-01 | 1949-06-28 | Int Standard Electric Corp | Means for measuring difference in frequency of alternating currents |
| BE472172A (en) * | 1946-03-27 | |||
| US2691132A (en) * | 1950-06-07 | 1954-10-05 | Collins Radio Co | Magnitude and phase meter |
| US2694954A (en) * | 1950-10-10 | 1954-11-23 | Winston E Kock | Electrical musical instrument |
| US3001175A (en) * | 1956-02-29 | 1961-09-19 | Walter P Christoph | Hydraulic rectifying bridge circuit |
| US3023397A (en) * | 1957-09-23 | 1962-02-27 | Jr Herbert B Reed | Hydraulic phase discriminator |
| US2961491A (en) * | 1958-08-05 | 1960-11-22 | Western Electric Co | Channel monitor unit for time division multiplex system |
| US3077544A (en) * | 1959-03-18 | 1963-02-12 | Mark E Connelly | Controlled transmission gate utilizing conventional and four-layer diodes in bridge cnfiguration |
| US4562403A (en) * | 1984-05-30 | 1985-12-31 | Donovan John S | Symmetrical discriminator and demodulator |
-
1937
- 1937-12-09 GB GB34143/37A patent/GB488158A/en not_active Expired
-
1938
- 1938-06-01 US US211158A patent/US2220098A/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| US2220098A (en) | 1940-11-05 |
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