GB1068771A - Improved equipment for monitoring radio transmitters - Google Patents
Improved equipment for monitoring radio transmittersInfo
- Publication number
- GB1068771A GB1068771A GB1108363A GB1108363A GB1068771A GB 1068771 A GB1068771 A GB 1068771A GB 1108363 A GB1108363 A GB 1108363A GB 1108363 A GB1108363 A GB 1108363A GB 1068771 A GB1068771 A GB 1068771A
- Authority
- GB
- United Kingdom
- Prior art keywords
- relay
- switch
- transmitter
- open
- 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
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/02—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation
- H03F1/0205—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers
- H03F1/0211—Modifications of amplifiers to raise the efficiency, e.g. gliding Class A stages, use of an auxiliary oscillation in transistor amplifiers with control of the supply voltage or current
- H03F1/0244—Stepped control
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Transmitters (AREA)
- Alarm Systems (AREA)
- Selective Calling Equipment (AREA)
Abstract
1,068,771. Radio signalling; monitoring transmitters. ASSOCIATED ELECTRICAL INDUSTRIES Ltd. Dec. 30, 1963 [March 20, 1963], No. 11083/63. Heading H4L. In an arrangement for monitoring a transmitter 1, Figs. 2a, 2b, at a remote receiver 5, the transmitter is arranged to be switched on and off in repeated succession by a transistor 3 or alternatively by a silicon controlled rectifier controlled by a multivibrator 10, the conducting period of the device 3 being substantially shorter than the non-conducting. At the receiver a detector 6 supplies a relay 7 (preferably electronic) which has a quick response but remains operated for a limited period beyond the " off " period of the transmitter so that while the push-button 8 is open the relay 7 will remain operated, but if a failure occurs it will release and operate an audible or visible signal. A normally open contact relay 9 operates only after a delay longer than the duration of each pulse so that when the switch 8 is open the contacts of relay 9 remain open. When switch 8 is closed the relay 9 operates and may connect a receiver for speech or other signals. Alternatively coded signals may be transmitted by operating the switch 8. In a modification the relay 9 is dispensed with and the switch 8 is connected in series with instead of across the device 3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1108363A GB1068771A (en) | 1963-03-20 | 1963-03-20 | Improved equipment for monitoring radio transmitters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB1108363A GB1068771A (en) | 1963-03-20 | 1963-03-20 | Improved equipment for monitoring radio transmitters |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1068771A true GB1068771A (en) | 1967-05-17 |
Family
ID=9979723
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB1108363A Expired GB1068771A (en) | 1963-03-20 | 1963-03-20 | Improved equipment for monitoring radio transmitters |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB1068771A (en) |
-
1963
- 1963-03-20 GB GB1108363A patent/GB1068771A/en not_active Expired
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