GB487170A - Arrangement for automatic tuning of radio receivers or the like - Google Patents

Arrangement for automatic tuning of radio receivers or the like

Info

Publication number
GB487170A
GB487170A GB1357/37A GB135737A GB487170A GB 487170 A GB487170 A GB 487170A GB 1357/37 A GB1357/37 A GB 1357/37A GB 135737 A GB135737 A GB 135737A GB 487170 A GB487170 A GB 487170A
Authority
GB
United Kingdom
Prior art keywords
diode
voltages
circuits
voltage
tapping
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
GB1357/37A
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.)
EK Cole Ltd
Original Assignee
EK Cole Ltd
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 EK Cole Ltd filed Critical EK Cole Ltd
Publication of GB487170A publication Critical patent/GB487170A/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

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

Abstract

487,170. Wireless receiving circuits. COLE, Ltd., E. K. Jan. 16, 1937, No. 1357. Convention date, Jan. 17, 1936. [Class 40 (v)] The voltage for controlling an automatic fine-tuning device in a radio receiver is derived from two coupled circuits associated with the I.F. stages of a superheterodyne receiver, the voltages across the two circuits being added vectorially and impressed on a rectifier. In the Figure the I.F. amplifier 1 of a superheterodyne receiver is coupled to the second detector over two circuits A, B, the inductance L2 of circuit B being coupled to an inductance L1 which supplies a diode rectifier 14<1>. A tapping 12 on inductance L1 of circuit 14 is connected to a second diode 14<11> and the diode load resistances 20, 16 are arranged so that the rectified voltages across them are in opposition, the resultant voltage being applied to the A.F.C. device over lead 22. The action of this arrangement is that the voltage applied to diode 14<1> is the vector sum of parts of the voltages across inductances L1 and L2. The resultant rectified voltage across resistance 16 has a definite value at the resonant frequency of circuits A and B which is utilized for purposes of automatic frequency control. The voltage from tapping 12 on L1 applied over condenser 18 to diode 14<11> is thus opposed to that derived from coil 11 the tapping being so arranged that the respective voltages across resistances 16, 20 are equal and opposed at resonance. In a modification, Fig. 4 (not shown), the diode 14<1> is constituted by the normal signal diode of the receiver which also provides the A.V.C. voltages as shown in the Figure.
GB1357/37A 1936-01-17 1937-01-16 Arrangement for automatic tuning of radio receivers or the like Expired GB487170A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
SE487170X 1936-01-17

Publications (1)

Publication Number Publication Date
GB487170A true GB487170A (en) 1938-06-16

Family

ID=20310565

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1357/37A Expired GB487170A (en) 1936-01-17 1937-01-16 Arrangement for automatic tuning of radio receivers or the like

Country Status (1)

Country Link
GB (1) GB487170A (en)

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