GB375129A - Improvements in or relating to superheterodyne receivers - Google Patents
Improvements in or relating to superheterodyne receiversInfo
- Publication number
- GB375129A GB375129A GB23497/31A GB2349731A GB375129A GB 375129 A GB375129 A GB 375129A GB 23497/31 A GB23497/31 A GB 23497/31A GB 2349731 A GB2349731 A GB 2349731A GB 375129 A GB375129 A GB 375129A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frequency
- condenser
- heterodyne
- bands
- receiver
- 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
- H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
- H03J3/00—Continuous tuning
- H03J3/28—Continuous tuning of more than one resonant circuit simultaneously, the tuning frequencies of the circuits having a substantially constant difference throughout the tuning range
Abstract
375,129. Wireless receiving systems. TELEFUNKEN GES. FUR DRAHTLOSE TELEGRAPHIE, 12, Hallesches Ufer, Berlin. Aug. 20, 1931, No. 23497. Convention date, Aug. 20, 1930. [Class 40 (v).] The intermediate frequency in a superheterodyne receiver lies within 0À7 of the lowest and 1.4 of the highest frequency on the desired frequency band. By this means the image frequency is widely separated from the received frequency, thus rendering high selectivity unnecessary. Where two wave bands are to be received, the intermediate frequency may be between the two bands. To facilitate ganging of the heterodyne and receiving circuits the local oscillator is tuned by a fixed condenser and small variable condenser having specially shaped vanes so that it may be unicontrolled with the receiver tuning condenser. If operation on several frequency bands is desired, a separate small variable heterodyne condenser is provided for each band. The receiver has preselection means preceding the heterodyne stage.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE375129X | 1930-08-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB375129A true GB375129A (en) | 1932-06-23 |
Family
ID=6344023
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB23497/31A Expired GB375129A (en) | 1930-08-20 | 1931-08-20 | Improvements in or relating to superheterodyne receivers |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB375129A (en) |
-
1931
- 1931-08-20 GB GB23497/31A patent/GB375129A/en not_active Expired
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