GB486071A - Improvements in or relating to radio receivers and high frequency amplifiers - Google Patents

Improvements in or relating to radio receivers and high frequency amplifiers

Info

Publication number
GB486071A
GB486071A GB2446737A GB2446737A GB486071A GB 486071 A GB486071 A GB 486071A GB 2446737 A GB2446737 A GB 2446737A GB 2446737 A GB2446737 A GB 2446737A GB 486071 A GB486071 A GB 486071A
Authority
GB
United Kingdom
Prior art keywords
intermediate frequency
tuning
voltage
correct
voltages
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
GB2446737A
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.)
AGA Baltic Radio AB
Original Assignee
AGA Baltic Radio AB
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 AGA Baltic Radio AB filed Critical AGA Baltic Radio AB
Priority to GB2446737A priority Critical patent/GB486071A/en
Publication of GB486071A publication Critical patent/GB486071A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02—Automatic frequency control
    • H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant

Landscapes

  • Superheterodyne Receivers (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

486,071. Wireless receiving-apparatus. COLE, Ltd., E. K. (Aga-Baltic Radio Aktiebolag) Sept. 8, 1937, No. 24467. [Class 40 (v)] A superheterodyne receiver with automatic fine tuning comprises an oscillator operating at the true intermediate frequency and means for deriving oscillations of approximately constant amplitude from the intermediate frequency amplifier ; the two oscillations being combined and rectified ; any variation in frequency resulting in a control voltage which is utilized in known manner. The radio-frequency amplifier 10 is followed by the frequency changer 12 and intermediate frequency amplifiers 16, 19, and the local oscillator 13 includes fine adjusting means controlled by potentials over conductor 15. A detector arrangement 23 is fed with voltages of true intermediate frequency from oscillator 24 and voltages of actual intermediate frequency derived from 16 through a limiter amplifier 25. When these two voltages are in phase quadrature it is arranged that the rectified voltage produced by diode 42 across resistance 43 is neutralized by the voltage derived from potentiometer 44, no control potential being applied to conductor 15. A departure from this phase relationship due to the intermediate frequency departing from its correct value results in a positive or negative potential being applied to correct the tuning. Muting of the receiver during tuning is obtained by means of diode 45. Voltages from oscillator 24 and from a point in the output of amplifier 25 which are in phase opposition when tuning is correct, are applied to the diode 45 and with correct dimensioning of condenser 46 no voltage appears across resistance 47 at correct tuning. When tuning is incorrect, however, the beat tones produced are rectified and when the resultant voltage which is passed by filter 48, 49 reaches a certain value, the intermediate frequency amplifier 19 is blocked by this voltage in known manner.
GB2446737A 1937-09-08 1937-09-08 Improvements in or relating to radio receivers and high frequency amplifiers Expired GB486071A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2446737A GB486071A (en) 1937-09-08 1937-09-08 Improvements in or relating to radio receivers and high frequency amplifiers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2446737A GB486071A (en) 1937-09-08 1937-09-08 Improvements in or relating to radio receivers and high frequency amplifiers

Publications (1)

Publication Number Publication Date
GB486071A true GB486071A (en) 1938-05-30

Family

ID=10212155

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2446737A Expired GB486071A (en) 1937-09-08 1937-09-08 Improvements in or relating to radio receivers and high frequency amplifiers

Country Status (1)

Country Link
GB (1) GB486071A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006018697A1 (en) 2004-08-13 2006-02-23 Nokia Corporation Single chip lna and vco having similar resonant circuit topology and using same calibration signal to compensate for process variations

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2006018697A1 (en) 2004-08-13 2006-02-23 Nokia Corporation Single chip lna and vco having similar resonant circuit topology and using same calibration signal to compensate for process variations
EP1779535A4 (en) * 2004-08-13 2015-05-27 Nokia Corp Single chip lna and vco having similar resonant circuit topology and using same calibration signal to compensate for process variations

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