GB497830A - Improvements in or relating to superheterodyne receivers - Google Patents
Improvements in or relating to superheterodyne receiversInfo
- Publication number
- GB497830A GB497830A GB8269/37A GB826937A GB497830A GB 497830 A GB497830 A GB 497830A GB 8269/37 A GB8269/37 A GB 8269/37A GB 826937 A GB826937 A GB 826937A GB 497830 A GB497830 A GB 497830A
- Authority
- GB
- United Kingdom
- Prior art keywords
- oscillator
- tuned
- circuit
- march
- inductance
- 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
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
- H03J5/24—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection
- H03J5/242—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection
Landscapes
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Abstract
497,830. Superheterodyne circuits for wireless reception. SCHAUB, G. VON. March 20, 1937, No. 8269. Convention date, March 21, 1936. [Class 40 (v)] In a superheterodyne receiver using a plurality of frequency changing stages, the input stage is structurally separate from the remainder of the receiver and is arranged as a movable remotely controlled part and comprises a variably tuned oscillator and fixed tuning elements switched in as the oscillator is progressively tuned. In a tuning range of 150 to 1500 kcs., the input circuit is preferably subdivided into three parts which are switched by the oscillator tuning member. Fig. 1 shows an oscillator tuned circuit C1, L3 and switches S1, S2 which connect an inductance L2 and a condenser C5 in parallel with the aerial inductance L1. Push-button switches may be provided to insert fixed condensers in the oscillator circuit to tune to selected stations. Fig. 2 shows the second detector V2, the input coupling to which is varied by resistance R to control volume. By the use of a series resistance R1 and arranging the capacitive and inductive couplings in opposition a complete control of volume may be secured even with screened and long connecting leads.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH497830X | 1936-03-21 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB497830A true GB497830A (en) | 1938-12-20 |
Family
ID=4516803
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8269/37A Expired GB497830A (en) | 1936-03-21 | 1937-03-20 | Improvements in or relating to superheterodyne receivers |
Country Status (2)
| Country | Link |
|---|---|
| FR (1) | FR819455A (en) |
| GB (1) | GB497830A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2549789A (en) * | 1947-12-31 | 1951-04-24 | Jr Thomas M Ferrill | Tank circuit apparatus |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1041545B (en) * | 1956-06-08 | 1958-10-23 | Elektrowerk G M B H | High-frequency attachment for amplification and frequency conversion |
-
1937
- 1937-03-20 FR FR819455D patent/FR819455A/en not_active Expired
- 1937-03-20 GB GB8269/37A patent/GB497830A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2549789A (en) * | 1947-12-31 | 1951-04-24 | Jr Thomas M Ferrill | Tank circuit apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| FR819455A (en) | 1937-10-19 |
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