GB618544A - Improvements in or relating to superheterodyne receiving circuits - Google Patents
Improvements in or relating to superheterodyne receiving circuitsInfo
- Publication number
- GB618544A GB618544A GB27540/46A GB2754046A GB618544A GB 618544 A GB618544 A GB 618544A GB 27540/46 A GB27540/46 A GB 27540/46A GB 2754046 A GB2754046 A GB 2754046A GB 618544 A GB618544 A GB 618544A
- Authority
- GB
- United Kingdom
- Prior art keywords
- image frequency
- coil
- coils
- order
- relating
- 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
- H03D7/18—Modifications of frequency-changers for eliminating image frequencies
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Details Of Television Scanning (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
618,544. Image frequency suppression. PHILIPS LAMPS, Ltd. Sept. 13, 1946, No. 27540. Convention date, Dec. 7, 1942. [Class 40 (viii)] In a superheterodyne receiver, in order to prevent the introduction of image frequency signals over the parasitic capacity 5 between the aerial coupling coil 1 and the tuned input circuit 2, 3, a neutralizing condenser 6 is inductively coupled to the coil 2 through the coil 7. In order to compensate for the small amount of image frequency voltage introduced directly through coils 1, 2, slight over- or underneutralizing may be employed according to the polarity of the mutual inductance between the coils 1, 2.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL244480X | 1942-12-07 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB618544A true GB618544A (en) | 1949-02-23 |
Family
ID=19780773
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB27540/46A Expired GB618544A (en) | 1942-12-07 | 1946-09-13 | Improvements in or relating to superheterodyne receiving circuits |
Country Status (4)
| Country | Link |
|---|---|
| BE (1) | BE453476A (en) |
| CH (1) | CH244480A (en) |
| FR (1) | FR900391A (en) |
| GB (1) | GB618544A (en) |
-
0
- BE BE453476D patent/BE453476A/xx unknown
-
1943
- 1943-12-06 FR FR900391D patent/FR900391A/en not_active Expired
- 1943-12-06 CH CH244480D patent/CH244480A/en unknown
-
1946
- 1946-09-13 GB GB27540/46A patent/GB618544A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| FR900391A (en) | 1945-06-27 |
| CH244480A (en) | 1946-09-15 |
| BE453476A (en) |
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