GB471065A - Improvements in wireless receiving apparatus - Google Patents
Improvements in wireless receiving apparatusInfo
- Publication number
- GB471065A GB471065A GB554036A GB554036A GB471065A GB 471065 A GB471065 A GB 471065A GB 554036 A GB554036 A GB 554036A GB 554036 A GB554036 A GB 554036A GB 471065 A GB471065 A GB 471065A
- Authority
- GB
- United Kingdom
- Prior art keywords
- wanted
- channel signals
- frequency
- local oscillator
- input
- 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)
- Superheterodyne Receivers (AREA)
Abstract
471,065. Wireless receiving-apparatus. ROBINSON, J. Feb. 24, 1936, No. 5540. [Class 40 (v)] In a superheterodyne receiver means are provided to produce different phase changes for wanted and second channel signals and a reactive coupling is provided such as to assist the wanted and oppose the second channel signals. Fig. 1 shows a frequency changer 12 having an input circuit 10 tuned to the frequency of the local oscillator 11 to produce the necessary relative phase change for the wanted and second channel signals. This circuit is preferably such as to give a response for wanted and second channel signals of onequarter the response at resonance. Beat frequency energy is combined with energy from the local oscillator 11 and is applied through a phase adjusting device 16 to the input. In a modification the tuned circuit of the local oscillator produces the required change in phase between the two signals, Fig. 3. A one-way device 20 is provided in the input and a filter 22 to isolate the oscillator frequency for combination with heat frequency energy. In a further modification the reaction is effected entirely in the pre-detection stage of the receiver.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB554036A GB471065A (en) | 1936-02-24 | 1936-02-24 | Improvements in wireless receiving apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB554036A GB471065A (en) | 1936-02-24 | 1936-02-24 | Improvements in wireless receiving apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB471065A true GB471065A (en) | 1937-08-24 |
Family
ID=9798092
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB554036A Expired GB471065A (en) | 1936-02-24 | 1936-02-24 | Improvements in wireless receiving apparatus |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB471065A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2445157A (en) * | 1944-05-26 | 1948-07-13 | Smith Wilbert Brockhouse | Interference reduction for radio signal receivers |
-
1936
- 1936-02-24 GB GB554036A patent/GB471065A/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2445157A (en) * | 1944-05-26 | 1948-07-13 | Smith Wilbert Brockhouse | Interference reduction for radio signal receivers |
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