GB914434A - Improvements in or relating to radio transmitter - Google Patents
Improvements in or relating to radio transmitterInfo
- Publication number
- GB914434A GB914434A GB3104159A GB3104159A GB914434A GB 914434 A GB914434 A GB 914434A GB 3104159 A GB3104159 A GB 3104159A GB 3104159 A GB3104159 A GB 3104159A GB 914434 A GB914434 A GB 914434A
- Authority
- GB
- United Kingdom
- Prior art keywords
- power
- aerial
- proportional
- voltage
- square root
- 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
- H03J1/00—Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
- H03J1/18—Control by auxiliary power
Landscapes
- Transmitters (AREA)
Abstract
914,434. Automatic control systems. STANDARD TELEPHONES & CABLES Ltd. Sept. 11, 1959, No. 31041/59. Class 38 (4). Power is supplied from a radio frequency source through an adjustable coupling element to a variable impedance and signals proportional to the square root of the power supplied to the load and proportional to the voltage of the radio frequency source are opposed to control the coupling element to reduce variations of power with variations of load impedance. In Fig. 1 the tank circuit 6 of the final stage of a radio transmitter is maintained in resonance with the signal applied at 2 from the preceding stages (not shown), by a reversible motor 12 automatically adjusting an inductance 11 under the control of a phase discriminator 16. Tank circuit 6 is coupled to an aerial 10 through another adjustable inductance 7 and a coaxial line 9. A circuit involving a current transformer T, a potential divider 37, 38, and rectifiers 31, 32, derives a voltage E2 proportional to the square root of the power supplied to the aerial. A circuit including a potential divider 23, 24 and a rectifier 22 derives a voltage E 1 proportional to the output voltage of stage 1. Any difference between voltages E 1 , E 2 is effective through a relay 17 to run a motor 15 and thereby adjust inductance 7 in the appropriate direction to prevent variations of aerial power, e.g. due to icing. Simpler circuits for deriving a less accurate approximations to the square root of aerial power are described.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3104159A GB914434A (en) | 1959-09-11 | 1959-09-11 | Improvements in or relating to radio transmitter |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB3104159A GB914434A (en) | 1959-09-11 | 1959-09-11 | Improvements in or relating to radio transmitter |
Publications (1)
Publication Number | Publication Date |
---|---|
GB914434A true GB914434A (en) | 1963-01-02 |
Family
ID=10317066
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3104159A Expired GB914434A (en) | 1959-09-11 | 1959-09-11 | Improvements in or relating to radio transmitter |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB914434A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2137781A (en) * | 1983-04-04 | 1984-10-10 | At & T Information Systems Inc | Automatic tuning arrangements |
-
1959
- 1959-09-11 GB GB3104159A patent/GB914434A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB2137781A (en) * | 1983-04-04 | 1984-10-10 | At & T Information Systems Inc | Automatic tuning arrangements |
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