GB670851A - Improvements in radio receiving circuits - Google Patents
Improvements in radio receiving circuitsInfo
- Publication number
- GB670851A GB670851A GB1193050A GB1193050A GB670851A GB 670851 A GB670851 A GB 670851A GB 1193050 A GB1193050 A GB 1193050A GB 1193050 A GB1193050 A GB 1193050A GB 670851 A GB670851 A GB 670851A
- Authority
- GB
- United Kingdom
- Prior art keywords
- circuit
- inductance
- coil
- image
- radio receiving
- 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)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
- Superheterodyne Receivers (AREA)
Abstract
670,851. Electric filters. MURPHY RADIO, Ltd. Nov. 14, 1946 [Sept. 23, 1944; May 22, 1945], Nos. 11930/50 (divided out of 18197/44), and 12749/45. Class 40 (viii). [Also in Group XL (c)] An image rejection circuit for a superheterodyne radio receiver comprises a tuned circuit, Fig. 3, the inductance N of which is coupled to a further inductance K from which the output is taken, the tuned circuit being resonant to the desired signal frequency and having a second resonance in conjunction with the inductance K whereby the unwanted image frequency is rejected. The input is applied to a coupling coil J which may be combined as an auto-transformer with the coil K, Figs. 1, 2 (not shown), or the coil N, Fig. 4 (not shown); in the arrangement of Fig. 1 the image-rejection circuit is preceded by a cathodefollower buffer valve, the aerial circuit being untuned.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1193050A GB670851A (en) | 1944-09-23 | 1944-09-23 | Improvements in radio receiving circuits |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1193050A GB670851A (en) | 1944-09-23 | 1944-09-23 | Improvements in radio receiving circuits |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB670851A true GB670851A (en) | 1952-04-23 |
Family
ID=9995256
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1193050A Expired GB670851A (en) | 1944-09-23 | 1944-09-23 | Improvements in radio receiving circuits |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB670851A (en) |
-
1944
- 1944-09-23 GB GB1193050A patent/GB670851A/en not_active Expired
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