GB764813A - Improvements in or relating to electric oscillation generators - Google Patents
Improvements in or relating to electric oscillation generatorsInfo
- Publication number
- GB764813A GB764813A GB688555A GB688555A GB764813A GB 764813 A GB764813 A GB 764813A GB 688555 A GB688555 A GB 688555A GB 688555 A GB688555 A GB 688555A GB 764813 A GB764813 A GB 764813A
- Authority
- GB
- United Kingdom
- Prior art keywords
- oscillator
- frequency
- rectifier
- shunting
- circuit
- 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
- 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
- H03F1/542—Replacing by standby devices
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Selective Calling Equipment (AREA)
Abstract
764,813. Keying carrier frequencies; valve circuits. STANDARD TELEPHONES & CABLES, Ltd. March 9, 1955, No. 6885/55. Classes 40(5) and 40(6) An oscillator is keyed on and off by a voltage applied to a rectifier 15 shunting at least part of the frequency determining resonant circuit, to vary its resistance above and below the critical value allowing or preventing oscillation. The voltage may be applied from a bias source 20, through contacts of a relay 19 to the rectifier load circuit 16, 21 the resistor 17 preventing sparking at the relay contacts. The oscillator may comprise two capacitors 6, 7 connected to the grid and cathode of a triode valve, and shunted by a series resonant circuit 8, 9 and grid leak resistor 5, the rectifier 15 effecting shunting an indicator 2 in its cathode circuit, which resonates with the capacitor 7 at a frequency very much below the frequency generated. Two such oscillators feeding a common output through buffer amplifiers, and of equal frequency, may each have individual output detectors operating relays to render, as above, the other oscillator inoperative, only one oscillator therfore being operative at a time and the other acting as a stand-by for automatically replacing the other.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB688555A GB764813A (en) | 1955-03-09 | 1955-03-09 | Improvements in or relating to electric oscillation generators |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB688555A GB764813A (en) | 1955-03-09 | 1955-03-09 | Improvements in or relating to electric oscillation generators |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB764813A true GB764813A (en) | 1957-01-02 |
Family
ID=9822570
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB688555A Expired GB764813A (en) | 1955-03-09 | 1955-03-09 | Improvements in or relating to electric oscillation generators |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB764813A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3289097A (en) * | 1964-05-11 | 1966-11-29 | Gen Dynamics Corp | Emergency clock pulse standby system |
| US3518986A (en) * | 1967-11-20 | 1970-07-07 | Beckman Instruments Inc | Patient monitoring safety system |
-
1955
- 1955-03-09 GB GB688555A patent/GB764813A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3289097A (en) * | 1964-05-11 | 1966-11-29 | Gen Dynamics Corp | Emergency clock pulse standby system |
| US3518986A (en) * | 1967-11-20 | 1970-07-07 | Beckman Instruments Inc | Patient monitoring safety system |
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