GB469579A - Image suppression system for superheterodyne radio receivers - Google Patents
Image suppression system for superheterodyne radio receiversInfo
- Publication number
- GB469579A GB469579A GB28626/36A GB2862636A GB469579A GB 469579 A GB469579 A GB 469579A GB 28626/36 A GB28626/36 A GB 28626/36A GB 2862636 A GB2862636 A GB 2862636A GB 469579 A GB469579 A GB 469579A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- primary
- capacity
- transformer
- image
- 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
- 230000001629 suppression Effects 0.000 title abstract 2
- 230000001939 inductive effect Effects 0.000 abstract 2
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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T74/00—Machine element or mechanism
- Y10T74/18—Mechanical movements
- Y10T74/18056—Rotary to or from reciprocating or oscillating
- Y10T74/18144—Overcoming dead center
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Superheterodyne Receivers (AREA)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
Abstract
469,579. Impedance networks for wireless reception. PHILCO RADIO & TELEVISION CORPORATION. Oct. 21, 1936, No. 28626. Convention date, Nov. 5, 1935. [Class 40 (iii)] To facilitate image frequency suppression the input circuit to a superheterodyne receiver comprises a transformer giving capacitive as well as inductive transfer and connected between the aerial and the primary an impedance which is inductive for signals but capacitive for image frequencies, and a capacity in shunt to the transformer primary of such a value that the primary circuit is resonant at a frequency below the lowest frequency it is desired to receive. The Figure shows an aerial connected to earth through an acceptor circuit L2, C2 for the intermediate frequency and through an inductance L1 to the primary of an input transformer. The inductance L1 is tuned by its inherent self capacity to a frequency at the lower end of the image frequency band while a capacity C1 is provided such that the input circuit as a whole is resonant at a frequency just below the signal frequency band but above the intermediate frequency.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US48407A US2062956A (en) | 1935-11-05 | 1935-11-05 | Image suppression system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB469579A true GB469579A (en) | 1937-07-28 |
Family
ID=21954393
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB28626/36A Expired GB469579A (en) | 1935-11-05 | 1936-10-21 | Image suppression system for superheterodyne radio receivers |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2062956A (en) |
| GB (1) | GB469579A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2512481A (en) * | 1947-06-25 | 1950-06-20 | Avco Mfg Corp | Antenna input circuits |
| US2711477A (en) * | 1951-06-13 | 1955-06-21 | Avco Mfg Corp | Tuner for television receivers |
-
1935
- 1935-11-05 US US48407A patent/US2062956A/en not_active Expired - Lifetime
-
1936
- 1936-10-21 GB GB28626/36A patent/GB469579A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US2062956A (en) | 1936-12-01 |
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