GB449391A - Improvements in or relating to wireless and like receivers - Google Patents

Improvements in or relating to wireless and like receivers

Info

Publication number
GB449391A
GB449391A GB3595934A GB3595934A GB449391A GB 449391 A GB449391 A GB 449391A GB 3595934 A GB3595934 A GB 3595934A GB 3595934 A GB3595934 A GB 3595934A GB 449391 A GB449391 A GB 449391A
Authority
GB
United Kingdom
Prior art keywords
receiver
circuit
tuning
frequency
bias
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
GB3595934A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to GB33806/35A priority Critical patent/GB450806A/en
Priority to GB3595934A priority patent/GB449391A/en
Priority to US54003A priority patent/US2323630A/en
Publication of GB449391A publication Critical patent/GB449391A/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
    • H03J7/042—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 with reactance tube

Landscapes

  • Circuits Of Receivers In General (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)

Abstract

449,391. Valve circuits for wireless reception. SPENCER, R. E., 8, Courtfield Gardens, Ealing, London. Dec. 14, 1934, No. 35959. [Class 40 (v)] A wireless receiver is automatically pulled into exact tune by causing the departure from tune to control. the bias on the outer grid of a hexode valve 32 functioning as a variable impedance, the reflected capacity in the control grid circuit varying the frequency-determining circuit 4 of the heptode frequency-changer 1 of a superheterodyne receiver. The output circuit of the intermediate-frequency amplifier 15 comprises a series circuit 19, 20 tuned to the intermediate frequency, the voltage across the condenser 20 being applied to a diode 23, 24, while that across inductance 21, coupled to 19, is applied to the diode 26, 24. The arrangement is such that when the receiver is exactly tuned, the two voltages are equal, and since the load resistances 27, 28 of the two diodes are connected in opposition there is then no p.d. between points A and A<1>; the bias of the outer grid of 32 is then determined by the resistance 34. If the receiver is detuned on one side or the other of the true I.F., the voltage across 21 or 20 predominates and the bias of the outer grid of 32 increases or decreases, the resulting change in input - circuit capacity varying the local oscillator circuit of 1 in compensating sense. The input capacity of 32 may be augmented by a small variable condenser 36 which may be unicontrolled with the receiver tuning to make the control even over the entire tuning range ; alternatively, the resistance 33 may be variable and may also be conjointly operated with the tuning for the same purpose ; or the condenser 36 or resistance 33 may be replaced by a number of fixed condensers or resistances respectively, selected by a switch ganged to the tuning control or the wave-range switch. Specification 450,806 is referred to. Reference has been directed by the Comptroller to Specification 437,442.
GB3595934A 1934-12-13 1934-12-14 Improvements in or relating to wireless and like receivers Expired GB449391A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB33806/35A GB450806A (en) 1934-12-13 1934-12-14 Improvements in and relating to wireless and like receivers
GB3595934A GB449391A (en) 1934-12-14 1934-12-14 Improvements in or relating to wireless and like receivers
US54003A US2323630A (en) 1934-12-13 1935-12-12 Radio receiving system

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3595934A GB449391A (en) 1934-12-14 1934-12-14 Improvements in or relating to wireless and like receivers

Publications (1)

Publication Number Publication Date
GB449391A true GB449391A (en) 1936-06-15

Family

ID=10383390

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3595934A Expired GB449391A (en) 1934-12-13 1934-12-14 Improvements in or relating to wireless and like receivers

Country Status (1)

Country Link
GB (1) GB449391A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2422082A (en) * 1943-03-03 1947-06-10 Rca Corp Reactance control circuit

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2422082A (en) * 1943-03-03 1947-06-10 Rca Corp Reactance control circuit

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