GB502706A - Improvements relating to automatic fine tuning in radio receivers - Google Patents
Improvements relating to automatic fine tuning in radio receiversInfo
- Publication number
- GB502706A GB502706A GB3054837A GB3054837A GB502706A GB 502706 A GB502706 A GB 502706A GB 3054837 A GB3054837 A GB 3054837A GB 3054837 A GB3054837 A GB 3054837A GB 502706 A GB502706 A GB 502706A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- coil
- low
- circuit
- frequency
- 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
- H03J7/14—Controlling the magnetic state of inductor cores
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Abstract
502,706. Automatic tuning correction. COLE, Ltd., E. K., MARTIN, A. W., and HUNT, H. Nov. 8, 1937, No. 30548. [Class 40 (v)] An automatic tuning correction system comprises a valve VI acting as a variable resist. ance to vary the current through an inductance 3 in dependence on a control voltage derived from a known discriminator network 7, the coil 3 being coupled to a second coil in the circuit whose frequency is to be controlled so as to vary the effective inductance of the second coil, the arrangement being such that the valve V1 also operates as a low frequency amplifier, deriving its low-frequency input over condenser 10 the output passing over condenser 11. The resistance 9 maintains the cathode potential of VI substantially constant despite variations in impedance of the valve. The valve V1 is preferably a multi-grid valve the coil 3 being connected in circuit with one of the grids other than the control grid while the L.F. output is taken from the anode circuit ; this prevents low-frequency signals from affecting the A.F.C. action, Fig. 2 (not shown). Or the control valve may form the hexode portion of a triodehexode, the triode section being the local oscillator of the receiver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3054837A GB502706A (en) | 1937-11-08 | 1937-11-08 | Improvements relating to automatic fine tuning in radio receivers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB3054837A GB502706A (en) | 1937-11-08 | 1937-11-08 | Improvements relating to automatic fine tuning in radio receivers |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB502706A true GB502706A (en) | 1939-03-23 |
Family
ID=10309360
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3054837A Expired GB502706A (en) | 1937-11-08 | 1937-11-08 | Improvements relating to automatic fine tuning in radio receivers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB502706A (en) |
-
1937
- 1937-11-08 GB GB3054837A patent/GB502706A/en not_active Expired
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US2243423A (en) | Automatic volume control circuit | |
| US2144304A (en) | Delayed automatic gain control circuit | |
| GB514723A (en) | Improvements in or relating to superheterodyne wireless receivers | |
| US2262916A (en) | Electric amplifying system | |
| US2018982A (en) | Delayed automatic volume control circuit | |
| US2323880A (en) | Wave amplitude limiting device | |
| US2420518A (en) | Power reduction circuit for radio receivers | |
| US2088210A (en) | Interstation noise suppressor circuits | |
| GB502706A (en) | Improvements relating to automatic fine tuning in radio receivers | |
| GB445543A (en) | Improvements in or relating to electrical high frequency oscillating circuit arrangements | |
| US2037456A (en) | Automatic volume control | |
| US2169830A (en) | Automatic selectivity control | |
| US1889018A (en) | Volume control | |
| US2144921A (en) | Automatic volume control | |
| US2302866A (en) | Amplifier circuits | |
| US2612602A (en) | Noise suppression circuit | |
| GB492263A (en) | Improvements in or relating to radio receivers and the like | |
| US2404712A (en) | Gain control circuit for radiotelegraph | |
| US2055891A (en) | Automatic volume control circuits | |
| GB493622A (en) | Improvements in or relating to frequency converter circuits | |
| US2148604A (en) | Signal-translating system | |
| US2237421A (en) | Automatic volume control | |
| US2221087A (en) | Converter automatic gain control | |
| US2163167A (en) | Automatic volume control circuit | |
| US2182677A (en) | High frequency receiving apparatus |