GB488112A - Improvements in or relating to radio and like receivers - Google Patents
Improvements in or relating to radio and like receiversInfo
- Publication number
- GB488112A GB488112A GB35886/36A GB3588636A GB488112A GB 488112 A GB488112 A GB 488112A GB 35886/36 A GB35886/36 A GB 35886/36A GB 3588636 A GB3588636 A GB 3588636A GB 488112 A GB488112 A GB 488112A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- condenser
- tune
- connections
- receiver
- 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
- 230000005284 excitation Effects 0.000 abstract 1
- 230000004048 modification Effects 0.000 abstract 1
- 238000012986 modification Methods 0.000 abstract 1
- 238000004804 winding Methods 0.000 abstract 1
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
Landscapes
- Circuits Of Receivers In General (AREA)
Abstract
488,112. Wireless receiving systems. MARCONI'S WIRELESS TELEGRAPH CO., Ltd., and KEALL, O. E. Dec. 31, 1936, No. 35886. [Class 40 (v)] Relates to receivers employing automatic frequency control with an asymmetrical characteristic, i.e. to systems in which the automatic control action is different when the receiver is off tune in one direction from when it is off tune in the other direction, a relay being employed to change the connections to make manual tuning possible in either direction. According to the invention a condenser C is connected to a variable source of potential, such as a cell T and potentiometer P, the variable element of which is ganged with the tuning condenser of the receiver. The charging current of the condenser C, when the slider S is moved, operates a meter type relay R, the contacts RC of which reverse the excitation of the winding R1 of a polarized relay the contacts (not shown) of which effect the necessary changes. The meter type relay may be employed directly to change the connections ; and in a modification, Fig. 3 (not shown), coil R is replaced by a resistance, the voltage across which is applied to the grid of a valve in whose anode circuit the polarized relay is connected.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB204389X | 1936-12-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB488112A true GB488112A (en) | 1938-06-30 |
Family
ID=10145959
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB35886/36A Expired GB488112A (en) | 1936-12-31 | 1936-12-31 | Improvements in or relating to radio and like receivers |
Country Status (4)
Country | Link |
---|---|
CH (1) | CH204389A (en) |
FR (1) | FR831406A (en) |
GB (1) | GB488112A (en) |
NL (1) | NL49984C (en) |
-
0
- NL NL49984D patent/NL49984C/xx active
-
1936
- 1936-12-31 GB GB35886/36A patent/GB488112A/en not_active Expired
-
1937
- 1937-12-10 CH CH204389D patent/CH204389A/en unknown
- 1937-12-28 FR FR831406D patent/FR831406A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
CH204389A (en) | 1939-04-30 |
NL49984C (en) | |
FR831406A (en) | 1938-09-02 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
GB385498A (en) | Improvements in or relating to electrical remote control systems suitable for remotely tuning radio and like tunable receivers | |
GB517636A (en) | Improvements in or relating to automatic tuning systems for radio receivers | |
US2333990A (en) | Tuning indication system | |
GB488112A (en) | Improvements in or relating to radio and like receivers | |
GB537937A (en) | Improvements in diversity systems of radio reception | |
GB473618A (en) | Improved automatic tuning control means for modulated carrier wave receivers | |
GB374695A (en) | Improvements in or relating to radio and other high frequency receivers | |
US2188490A (en) | Radio receiving apparatus | |
US2108420A (en) | Automatic tuning control | |
US2088179A (en) | Automatic volume control circuits | |
US2125468A (en) | Radio tuning indicator | |
US2280607A (en) | Frequency modulation receiver tuning indicator | |
US2569296A (en) | Frequency converter with plural selectable oscillators | |
US2171677A (en) | Rectifier system | |
GB493622A (en) | Improvements in or relating to frequency converter circuits | |
US2044925A (en) | Detector | |
GB505598A (en) | Improvements in or relating to automatic tuning devices for radio receivers | |
GB497798A (en) | Improvements in or relating to radio and like receivers | |
GB379212A (en) | Improvements in or relating to radio receivers | |
GB682805A (en) | Improvements in tuning indication arrangements for wireless receivers | |
GB515584A (en) | Improvements in or relating to radio receivers | |
US2166675A (en) | Tuning control system for high fidelity receivers | |
GB444826A (en) | Improvements in and relating to wireless receiving systems | |
GB406895A (en) | Improvements in or relating to frequency changing circuits and superheterodyne receivers incorporating the same | |
GB497396A (en) | Improvements in and relating to electrical signalling apparatus |