GB643669A - Improvements in or relating to superheterodyne radio receiving sets - Google Patents
Improvements in or relating to superheterodyne radio receiving setsInfo
- Publication number
- GB643669A GB643669A GB7300/47A GB730047A GB643669A GB 643669 A GB643669 A GB 643669A GB 7300/47 A GB7300/47 A GB 7300/47A GB 730047 A GB730047 A GB 730047A GB 643669 A GB643669 A GB 643669A
- Authority
- GB
- United Kingdom
- Prior art keywords
- voltage
- oscillator
- beat
- anode
- oscillation
- 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
- 230000010355 oscillation Effects 0.000 abstract 2
- 230000035559 beat frequency Effects 0.000 abstract 1
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/02—Amplitude-modulated carrier systems, e.g. using on-off keying; Single sideband or vestigial sideband modulation
- H04L27/06—Demodulator circuits; Receiver circuits
- H04L27/063—Superheterodyne receivers
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Abstract
643,669. Automatic volume control. STANDARD TELEPHONES & CABLES, Ltd. March 17, 1947, No. 7300. Convention date, Jan. 30, 1946. [Class 40 (v)] A C.W. receiver incorporating automatic volume control is provided with a variable biassing arrangement in the A.V.C. line to neutralize the change of A.V.C. voltage when the beat oscillation is brought into operation. As shown, a detector valve has the signal fed to its first anode D1 through a tuned transformer and produces the audio output at BF. The signal voltage is also fed to the second anode D2 through condenser C1 to produce an A.V.C. voltage across the load resistors R2, R3. When the beat oscillator valve V2 is switched by H.T. switch K1 on for C.W. reception, the A.V.C. voltage tends to rise due to the rectification of the beat frequency in the A.V.C. detector. This is compensated by passing the oscillator cathode current through resistor R3 to produce an opposing voltage when the oscillator is in operation, which varies in dependence upon the amplitude of the oscillation. In an alternative arrangement (Fig. 4, not shown), a common cathode double diode triode is used in a circuit similar to that of Fig. 2, and in a further alternative arrangement (Fig. 3, not shown) the opposing bias is obtained from the slider of a potentiometer supplying H.T. to the oscillator. Specification 518,437 is referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL643669X | 1946-01-30 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB643669A true GB643669A (en) | 1950-09-27 |
Family
ID=19791847
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB7300/47A Expired GB643669A (en) | 1946-01-30 | 1947-03-17 | Improvements in or relating to superheterodyne radio receiving sets |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB643669A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1118278B (en) * | 1959-04-04 | 1961-11-30 | Suedwestfunk | Control method for generating a constant amplitude of the mixed product of a ring modulator |
-
1947
- 1947-03-17 GB GB7300/47A patent/GB643669A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1118278B (en) * | 1959-04-04 | 1961-11-30 | Suedwestfunk | Control method for generating a constant amplitude of the mixed product of a ring modulator |
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