GB547737A - Improvements in or relating to radio receivers - Google Patents
Improvements in or relating to radio receiversInfo
- Publication number
- GB547737A GB547737A GB1633/41A GB163341A GB547737A GB 547737 A GB547737 A GB 547737A GB 1633/41 A GB1633/41 A GB 1633/41A GB 163341 A GB163341 A GB 163341A GB 547737 A GB547737 A GB 547737A
- Authority
- GB
- United Kingdom
- Prior art keywords
- reception
- switch
- modulated signals
- intermediate frequency
- local oscillator
- 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
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
- H03D7/06—Transference of modulation from one carrier to another, e.g. frequency-changing by means of discharge tubes having more than two electrodes
- H03D7/10—Transference of modulation from one carrier to another, e.g. frequency-changing by means of discharge tubes having more than two electrodes the signals to be mixed being applied between different pairs of electrodes
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Superheterodyne Receivers (AREA)
Abstract
547,737. Superheterodyne circuits for wireless reception. STANDARD TELEPHONES & CABLES, Ltd., and HOLLAND, J. D. Feb. 7, 1941, No. 1633. [Class 40 (v)] In a superheterodyne receiver employing automatic gain control a separate electric path is provided after the controlled intermediate frequency amplifier into which local beating oscillations are injected for heterodyne reception. This path is separate from that used for receiving modulated signals. The Figure shows a triodehexode local oscillator and mixing valve lightly coupled to the output of the preceding intermediate frequency amplifier. The output circuit L3 C1 may be tuned to the beat frequency and a switch S1 associated with the volume control of the output stage be provided to change over to the reception of modulated signals, in which case the local oscillator is rendered inoperative by the switch S2.
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1633/41A GB547737A (en) | 1941-02-07 | 1941-02-07 | Improvements in or relating to radio receivers |
US432589A US2314785A (en) | 1941-02-07 | 1942-02-27 | Radio receiver |
FR931748D FR931748A (en) | 1941-02-07 | 1946-08-01 | Improvements in the reception of signals and CW |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB1633/41A GB547737A (en) | 1941-02-07 | 1941-02-07 | Improvements in or relating to radio receivers |
Publications (1)
Publication Number | Publication Date |
---|---|
GB547737A true GB547737A (en) | 1942-09-09 |
Family
ID=9725316
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1633/41A Expired GB547737A (en) | 1941-02-07 | 1941-02-07 | Improvements in or relating to radio receivers |
Country Status (3)
Country | Link |
---|---|
US (1) | US2314785A (en) |
FR (1) | FR931748A (en) |
GB (1) | GB547737A (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
NL66625C (en) * | 1944-11-03 | |||
US2593349A (en) * | 1947-11-01 | 1952-04-15 | Rca Corp | Beat frequency oscillator for receivers |
US2726327A (en) * | 1953-01-27 | 1955-12-06 | Raytheon Mfg Co | Mixer circuits |
US3018372A (en) * | 1958-02-17 | 1962-01-23 | Sarkes Tarzian | High frequency tuner |
-
1941
- 1941-02-07 GB GB1633/41A patent/GB547737A/en not_active Expired
-
1942
- 1942-02-27 US US432589A patent/US2314785A/en not_active Expired - Lifetime
-
1946
- 1946-08-01 FR FR931748D patent/FR931748A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
FR931748A (en) | 1948-03-02 |
US2314785A (en) | 1943-03-23 |
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