GB676541A - Improvements in or relating to radio circuit-arrangements - Google Patents
Improvements in or relating to radio circuit-arrangementsInfo
- Publication number
- GB676541A GB676541A GB27247/49A GB2724749A GB676541A GB 676541 A GB676541 A GB 676541A GB 27247/49 A GB27247/49 A GB 27247/49A GB 2724749 A GB2724749 A GB 2724749A GB 676541 A GB676541 A GB 676541A
- Authority
- GB
- United Kingdom
- Prior art keywords
- grid
- circuit
- valve
- feed
- fed
- 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
- 241000143236 Idaea efflorata Species 0.000 abstract 1
- 238000001514 detection method Methods 0.000 abstract 1
- 238000009499 grossing Methods 0.000 abstract 1
- 238000000034 method Methods 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G3/00—Gain control in amplifiers or frequency changers
- H03G3/20—Automatic control
- H03G3/22—Automatic control in amplifiers having discharge tubes
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03G—CONTROL OF AMPLIFICATION
- H03G11/00—Limiting amplitude; Limiting rate of change of amplitude ; Clipping in general
- H03G11/06—Limiters of angle-modulated signals; such limiters combined with discriminators
Landscapes
- Circuits Of Receivers In General (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
676,541. Frequency modulation. PHILIPS ELECTRICAL, Ltd. Oct. 24, 1949 [Oct. 27, 1948], No. 27247/49. Class 40 (v). In a radio receiver in which amplitude modulation is eliminated by a process of detection and negative feed-back as in Specification 659,598, the circuit is so modified as to permit of the use of a diode detector with an earthed cathode and with a single output filter from which both the feed-back voltage and the normal A.V.C voltage can be derived. The incoming F.M. wave is passed through the usual amplifying stage 1 and further frequency-changing or other stages (not shown) to an amplifier 2 having two control grids 14, 15. The output circuit 18 is connected to a diode 3 and load filter 4 across which detected A.M. is fed to the inner grid 15 of the valve 2, and A.V.C. voltage is fed through a smoothing circuit 22 to the control grid of the valve 1. The detected A.M. is amplified in the screen-grid circuit and fed with reversed phase from the impedance 7 through a condenser 8 to the outer control grid 14 of the same valve 2. The valve 2 is operated under such bias conditions that the A.M. modulates the wave passing through that valve in a negative or inverse sense, and so substantially annuls the unwanted A.M., as explained in the specification with reference to Figs. 2 and 3 (not shown). The H.F. feed may be to the grid 15 and the A.M. feed to the grid 14; and the A.M. may be amplified in the anode circuit instead of the screen circuit.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL676541X | 1948-10-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB676541A true GB676541A (en) | 1952-07-30 |
Family
ID=19802298
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB27247/49A Expired GB676541A (en) | 1948-10-27 | 1949-10-24 | Improvements in or relating to radio circuit-arrangements |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB676541A (en) |
-
1949
- 1949-10-24 GB GB27247/49A patent/GB676541A/en not_active Expired
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US2058512A (en) | Radio receiver | |
| GB534457A (en) | Improvements in and relating to detector coupling circuits | |
| GB676541A (en) | Improvements in or relating to radio circuit-arrangements | |
| GB615987A (en) | Improvements in or relating to circuits for amplifying electrical oscillations | |
| US2366565A (en) | Audio-frequency amplifier | |
| GB677506A (en) | Improvements in pulse amplifiers | |
| US2263825A (en) | Signal translating stage | |
| US2041291A (en) | Detector circuit | |
| GB611564A (en) | Improvements in or relating to radio and like receivers | |
| US2317474A (en) | Superregenerative receiver | |
| GB623668A (en) | Improvements in or relating to circuit-arrangements for limiting and detecting frequency-modulated oscillations | |
| US2361616A (en) | Demodulator circuits | |
| SU109141A1 (en) | Devices with exponential characteristics | |
| US2070640A (en) | Means for and method of detection | |
| GB846387A (en) | Frequency variation response circuit | |
| GB629954A (en) | Improvements in circuit arrangements employing thermionic valves | |
| US2768288A (en) | Frequency-demodulation circuit | |
| US2205880A (en) | Modulation system | |
| US2048738A (en) | Detector circuit | |
| GB687783A (en) | Improvements relating to circuit arrangements for modulating carrier frequency signals | |
| GB668436A (en) | Improvements in and relating to electron discharge amplifiers | |
| GB876042A (en) | Improvements in or relating to transistor circuit arrangements for demodulating and amplifying signals | |
| GB680568A (en) | A tone control arrangement for a low frequency signal amplifier | |
| GB596531A (en) | Improvements in amplifying circuits for angle modulated waves | |
| GB684612A (en) | Improvements in audio limiter circuits |