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GB914434A - Improvements in or relating to radio transmitter - Google Patents

Improvements in or relating to radio transmitter

Info

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
Application number
GB3104159A
Inventor
Louis John Heaton-Armstrong
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB3104159A priority Critical patent/GB914434A/en
Publication of GB914434A publication Critical patent/GB914434A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03JTUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J1/00Details of adjusting, driving, indicating, or mechanical control arrangements for resonant circuits in general
    • H03J1/18Control 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.
GB3104159A 1959-09-11 1959-09-11 Improvements in or relating to radio transmitter Expired GB914434A (en)

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)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2137781A (en) * 1983-04-04 1984-10-10 At & T Information Systems Inc Automatic tuning arrangements

Cited By (1)

* Cited by examiner, † Cited by third party
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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