GB479788A - Improvements in or relating to image suppression circuits for superheterodyne radio receivers - Google Patents
Improvements in or relating to image suppression circuits for superheterodyne radio receiversInfo
- Publication number
- GB479788A GB479788A GB34402/36A GB3440236A GB479788A GB 479788 A GB479788 A GB 479788A GB 34402/36 A GB34402/36 A GB 34402/36A GB 3440236 A GB3440236 A GB 3440236A GB 479788 A GB479788 A GB 479788A
- Authority
- GB
- United Kingdom
- Prior art keywords
- impedance
- earthed
- terminals
- frequency
- 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)
- Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
- Magnetic Resonance Imaging Apparatus (AREA)
Abstract
479,788. Impedance networks. PHILCO RADIO & TELEVISION CORPORATION. Dec. 15, 1936, No. 34402. Convention date, April 27. [Classes 40 (iii) and 40 (v)] An image-suppressor circuit for connecting a superheterodyne receiver alternatively to a high-impedance antenna A or a low-impedance transmission line TL is provided with a circuit C, L, C1 tunable to the signal frequency and a coupling C2, S, C1 fixedly tuned to a frequency substantially below the undesired frequency, so that the undesired signal is attenuated more than the desired signal both by the shunt condenser C1 and bv the series inductance L. The secondary S, with 100 turns in a particular example, is earthed through a blocking-condenser C2 and is closed-coupled to a 600-turn primary P and 100-turn primary P1, all three coils being on the same closely wound former. When the aerial is to be used it is connected to terminal a and terminal d is earthed, the input impedance across terminals a, d being high. When the transmission line T, L is to be used it is connected to terminals b, d, and the midtapping c of the primary P1 is earthed; the input impedance across terminals b, d is then low, to match the line TL.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US76673A US2097359A (en) | 1936-04-27 | 1936-04-27 | Image suppression circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB479788A true GB479788A (en) | 1938-02-11 |
Family
ID=22133511
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB34402/36A Expired GB479788A (en) | 1936-04-27 | 1936-12-15 | Improvements in or relating to image suppression circuits for superheterodyne radio receivers |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US2097359A (en) |
| GB (1) | GB479788A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE469329A (en) * | 1945-12-04 |
-
1936
- 1936-04-27 US US76673A patent/US2097359A/en not_active Expired - Lifetime
- 1936-12-15 GB GB34402/36A patent/GB479788A/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| US2097359A (en) | 1937-10-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US2281661A (en) | Tuning system | |
| GB479788A (en) | Improvements in or relating to image suppression circuits for superheterodyne radio receivers | |
| US3469194A (en) | Television tuner input circuit for vhf and uhf signals | |
| GB514640A (en) | Image-suppression system for wireless receivers | |
| GB548539A (en) | Wide-band coupling circuits | |
| GB519727A (en) | Improvement in television receivers | |
| US2189688A (en) | Multiband radio receiver | |
| GB422029A (en) | Improvements in or relating to radio and like receivers | |
| US2159546A (en) | Antenna coupling device for radio receivers | |
| GB458655A (en) | Improvements in or relating to superheterodyne receiving circuits | |
| US2224115A (en) | Band-filter coupling circuit for television amplifiers | |
| GB450965A (en) | Improvements in antennae for radio receiving systems and the like | |
| GB469579A (en) | Image suppression system for superheterodyne radio receivers | |
| GB515710A (en) | Improvements in or relating to aerial systems for wireless receivers | |
| GB448321A (en) | Image suppressing circuits for superheterodyne radio receivers | |
| US2159970A (en) | Radio receiver | |
| GB481221A (en) | Improvements in or relating to radio receiving systems | |
| GB466981A (en) | Improvements in or relating to antenna coupling devices | |
| US2052686A (en) | Multirange regenerative receiver | |
| GB490138A (en) | Improvements in multi-band radio receivers | |
| US1671959A (en) | Means for eliminating reactive coupling in radiocircuits | |
| GB410499A (en) | Improvements in or relating to electrical resonant circuit arrangements | |
| GB501644A (en) | Improvements in or relating to radio receivers | |
| GB535078A (en) | Tunable selector of uniform band width | |
| GB446018A (en) | Improvements in or relating to superheterodyne radio receivers |