GB804103A - Automatic tuning system - Google Patents

Automatic tuning system

Info

Publication number
GB804103A
GB804103A GB9939/56A GB993956A GB804103A GB 804103 A GB804103 A GB 804103A GB 9939/56 A GB9939/56 A GB 9939/56A GB 993956 A GB993956 A GB 993956A GB 804103 A GB804103 A GB 804103A
Authority
GB
United Kingdom
Prior art keywords
amplifier
antenna
output
derived
sign
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
GB9939/56A
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
Publication of GB804103A publication Critical patent/GB804103A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/38—Impedance-matching networks
    • H03H7/40—Automatic matching of load impedance to source impedance

Landscapes

  • Transmitters (AREA)
  • Variable-Direction Aerials And Aerial Arrays (AREA)

Abstract

804,103. Automatic tuning and impedance matching control systems. STANDARD TELEPHONES & CABLES, Ltd. March 29, 1956 [April 4, 1955], No. 9939/56. Class 38 (4). [Also in Groups XXXVIII and XL (c)] A transmitting antenna is automatically tuned and impedance matched with a transmission line by two servo systems having motors controlled by amplified control signals whose magnitude and polarity are dependent on the error and its sense, and successive reversals of sign of the error signal due to overshoot are used to successively attenuate the control signals. As shown, the antenna tuning is controlled by a shorting bar 7 variably connected between a loading inductance 6 and an earthed container 4 and the impedance of the antenna adjusted by a variable tan 5 on the inductance. Mistuning of the antenna is detected by a reactance circuit X which detects the relative phase between the line voltage derived across shunt circuit 30, 24, 25, 37 and the line current derived from current transformer 22, the two being in phase quadrature, for antenna resonance, at opposite sides of opposed rectifiers 17, 18 due to phase shift networks 28, 29, 35, 31 and 26, 27, 36, 32, and an output dependent on mistuning being derived from capacitor 37 and applied through D.C. amplifier 10 to a servomotor 11 controlling the position of the tuning short 7. Further, each reversal in sign of the output of D.C. amplifier 10 operates a polarized relay 42, 42a energizing a stepping switch 44 so that a wiper 40 is moved one step in turn along a potentiometer resistance 9 at the input of amplifier 10, to reduce the loop gain and motor speed. Similarly, a resistance circuit R with opposed rectifiers 20, 19 measures inequality between the voltages derived from the line and from a tap on the secondary of the current transformer 22, to derive an output to D.C. amplifier 14 controlling through a motor 15 the adjustment of tap 5. Further, each reversal in sign of the output of D.C. amplifier 14 operates a polarized relay 43 energizing a stepping switch 45 to successively step a wiper 41 on resistance 13 so that the input to amplifier 14 is reduced. Manual switches 48, 49 are used to reset the stepping switches 9, 13.
GB9939/56A 1955-04-04 1956-03-29 Automatic tuning system Expired GB804103A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US498865A US2874274A (en) 1955-04-04 1955-04-04 Automatic tuning system

Publications (1)

Publication Number Publication Date
GB804103A true GB804103A (en) 1958-11-05

Family

ID=23982828

Family Applications (1)

Application Number Title Priority Date Filing Date
GB9939/56A Expired GB804103A (en) 1955-04-04 1956-03-29 Automatic tuning system

Country Status (2)

Country Link
US (1) US2874274A (en)
GB (1) GB804103A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112009000053T5 (en) 2008-01-14 2010-10-14 Epcos Ag Improvements in portable wireless devices or in relation to them

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3281721A (en) * 1962-05-11 1966-10-25 Sperry Rand Corp Impedance matching system
US3381222A (en) * 1964-06-12 1968-04-30 John L. Gray Radio telephone with automatically tuned loaded antenna
US3643163A (en) * 1970-02-11 1972-02-15 Avco Corp High-order mixer and comparator
US3922679A (en) * 1974-08-06 1975-11-25 Us Army Wide band radio-frequency phase sensor
US5231355A (en) * 1990-06-18 1993-07-27 The Charles Machine Works, Inc. Locator transmitter having an automatically tuned antenna
AU699507B2 (en) * 1995-05-06 1998-12-03 Lyndon Bates Bulk storage hoppers
US7176840B1 (en) 2005-04-08 2007-02-13 Michael Peter Kelley Variable spacing inductance coil apparatus and method
US8421695B2 (en) * 2009-04-10 2013-04-16 Ethertronics, Inc. Multi-frequency, noise optimized active antenna
CN114710170B (en) * 2022-03-25 2023-12-05 北京北广科技股份有限公司 Medium-length wave automatic antenna tuning circuit and system

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2449174A (en) * 1942-04-13 1948-09-14 Decca Record Co Ltd Antenna supply phase and amplitude control
US2358454A (en) * 1942-04-29 1944-09-19 Rca Corp Automatic circuit tuning
US2376667A (en) * 1943-03-29 1945-05-22 Rca Corp Automatic tuning of transmitters
GB582181A (en) * 1943-05-31 1946-11-07 English Electric Co Ltd Improvements in the regulating of follow-up mechanisms
US2497202A (en) * 1944-12-30 1950-02-14 Rca Corp Electronic relay
US2519043A (en) * 1948-08-10 1950-08-15 Gen Precision Lab Inc Motor energization circuit
US2617084A (en) * 1950-04-08 1952-11-04 Rca Corp Servo system with antihunt means
US2742618A (en) * 1951-12-29 1956-04-17 Collins Radio Co Phasing and magnitude adjusting circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE112009000053T5 (en) 2008-01-14 2010-10-14 Epcos Ag Improvements in portable wireless devices or in relation to them
US8330667B2 (en) 2008-01-14 2012-12-11 Epcos Ag Portable wireless device

Also Published As

Publication number Publication date
US2874274A (en) 1959-02-17

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