GB596722A - Improvements in thermionic valve circuits, systems, or apparatus for the reception of wireless, television and the like signals - Google Patents
Improvements in thermionic valve circuits, systems, or apparatus for the reception of wireless, television and the like signalsInfo
- Publication number
- GB596722A GB596722A GB1973345A GB1973345A GB596722A GB 596722 A GB596722 A GB 596722A GB 1973345 A GB1973345 A GB 1973345A GB 1973345 A GB1973345 A GB 1973345A GB 596722 A GB596722 A GB 596722A
- Authority
- GB
- United Kingdom
- Prior art keywords
- signals
- circuit
- grid
- anode
- carrier signals
- 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
- 239000000969 carrier Substances 0.000 abstract 4
- 230000000051 modifying Effects 0.000 abstract 4
- 239000003990 capacitor Substances 0.000 abstract 1
- 238000006243 chemical reaction Methods 0.000 abstract 1
- 230000001808 coupling Effects 0.000 abstract 1
- 238000010168 coupling process Methods 0.000 abstract 1
- 238000005859 coupling reaction Methods 0.000 abstract 1
- 230000003534 oscillatory Effects 0.000 abstract 1
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
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/26—Circuits for superheterodyne receivers
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Superheterodyne Receivers (AREA)
Abstract
596,722. Valve superheterodyne circuits. FORD, D'A. N. Aug. 1, 1945, No. 19733. [Class 40 (v)] A frequency changer comprises a local oscillator operating at the intermediate frequency, and means for modulating the local oscillations in accordance with the modulations on the incoming carrier signals. Carrier signals from input circuit LC are rectified at grid G1 by virtue of circuit C1, R5, to impress the modulation components of the signals on the electron stream in multi-electrode valve V. Grid G4 is associated with anode A in an oscillatory circuit tuned to the intermediate frequency, so that modulated signals at this frequency appear in the anode circuit which includes byepass arrangements for unwanted frequencies. The output may be fed to a similar frequency changer generating a different intermediate frequency or direct to normal I.F. amplifiers. Variable components R1, C3 are amplitude , controls for the local oscillations. Alternatively, the oscillator section may comprise grids G2, G3 and grid G4 may accept the carrier signals. In this case, a differential capacitor may provide the amplitude control and the output transformer may be associated with a tuned circuit in the anode lead, or in the oscillator section with a coupling condenser between the anode and control grid. The rectified carrier signals may be supplied to valve V from a separate detector with or without reaction.
Publications (1)
Publication Number | Publication Date |
---|---|
GB596722A true GB596722A (en) | 1948-01-09 |
Family
ID=1734955
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1973345A Expired GB596722A (en) | 1945-08-01 | Improvements in thermionic valve circuits, systems, or apparatus for the reception of wireless, television and the like signals |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB596722A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2749518A (en) * | 1951-06-27 | 1956-06-05 | Itt | Frequency modulated oscillator system |
-
1945
- 1945-08-01 GB GB1973345A patent/GB596722A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2749518A (en) * | 1951-06-27 | 1956-06-05 | Itt | Frequency modulated oscillator system |
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