GB639966A - Improvements in superheterodyne radio-receiving apparatus - Google Patents
Improvements in superheterodyne radio-receiving apparatusInfo
- Publication number
- GB639966A GB639966A GB9507/48A GB950748A GB639966A GB 639966 A GB639966 A GB 639966A GB 9507/48 A GB9507/48 A GB 9507/48A GB 950748 A GB950748 A GB 950748A GB 639966 A GB639966 A GB 639966A
- Authority
- GB
- United Kingdom
- Prior art keywords
- alarm
- signal
- oscillator
- cessation
- april
- 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
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/06—Receivers
- H04B1/16—Circuits
- H04B1/26—Circuits for superheterodyne receivers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/52—Circuit arrangements for protecting such amplifiers
- H03F1/54—Circuit arrangements for protecting such amplifiers with tubes only
Landscapes
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Power Engineering (AREA)
- Circuits Of Receivers In General (AREA)
Abstract
639,966. Valve circuits for radio reception. PHILIPS ELECTRICAL, Ltd. April 5, 1948, No. 9507. Convention date, April 8, 1947. [Class 40 (vi)] A superheterodyne receiver has means (not shown) dependent on an output voltage for giving an alarm or effecting a change-over to spare apparatus on failure of the receiving apparatus. In order that the alarm or change-over shall not operate due to a cessation of the received signal, an additional oscillator 7 is provided which supplies to the input stage 2 a signal of the same frequency as the incoming signal but at a smaller amplitude. During normal reception, oscillator 7 is inhibited by intermediate frequency energy rectified at 9. On cessation of the incoming signal, reduction of the I.F. output allows oscillator 7 to supply a replacement signal sufficient to prevent operation of the alarm. If, however, the receiver is faulty, there will still be no I.F. output and the alarm will operate or new apparatus will be substituted.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL639966X | 1947-04-08 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB639966A true GB639966A (en) | 1950-07-12 |
Family
ID=19788990
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB9507/48A Expired GB639966A (en) | 1947-04-08 | 1948-04-05 | Improvements in superheterodyne radio-receiving apparatus |
Country Status (3)
Country | Link |
---|---|
BE (2) | BE401708A (en) |
FR (1) | FR964286A (en) |
GB (1) | GB639966A (en) |
-
0
- BE BE481708D patent/BE481708A/xx unknown
- FR FR964286D patent/FR964286A/fr not_active Expired
- BE BE401708D patent/BE401708A/xx unknown
-
1948
- 1948-04-05 GB GB9507/48A patent/GB639966A/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
BE401708A (en) | |
FR964286A (en) | 1950-08-09 |
BE481708A (en) |
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