GB267617A - Improvements in radio receiving systems - Google Patents

Improvements in radio receiving systems

Info

Publication number
GB267617A
GB267617A GB3208125A GB3208125A GB267617A GB 267617 A GB267617 A GB 267617A GB 3208125 A GB3208125 A GB 3208125A GB 3208125 A GB3208125 A GB 3208125A GB 267617 A GB267617 A GB 267617A
Authority
GB
United Kingdom
Prior art keywords
detector
local oscillator
grid
intermediate frequency
separately adjustable
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
GB3208125A
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.)
AT&T Corp
Original Assignee
Western Electric Co Inc
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 Western Electric Co Inc filed Critical Western Electric Co Inc
Priority to GB3208125A priority Critical patent/GB267617A/en
Publication of GB267617A publication Critical patent/GB267617A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
    • H03D7/06—Transference of modulation from one carrier to another, e.g. frequency-changing by means of discharge tubes having more than two electrodes
    • H03D7/08—Transference of modulation from one carrier to another, e.g. frequency-changing by means of discharge tubes having more than two electrodes the signals to be mixed being applied between the same two electrodes

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Superheterodyne Receivers (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

267,617. Standard Telephones & Cables, Ltd., (Western Electric Co., Inc.). Dec. 18, 1925. Thermionic heterodune receivers. -In a super-heterodyne receiver comprising a local oscillator 8, detector 6 for intermediate frequency, detector 21 for audiofrequency, and amplifiers 13, 14, 15, 23, the detector 6 and local oscillator 8 are coupled by a resistance 9, which serves also as grid leak for the detector 6 and is of such magnitude (e.g. 2 megohms) that tuning adjustment of either of the valves does not affect the tuning of the other. A condenser 25<11> connects the plate of one amplifier to the grid of the next amplifier but one, in order to check undesired oscillations. The input coupling includes separately adjustable coils 3, 4, and similarly the reaction coupling of the local oscillator 8 includes separately adjustable coils 10, 10<a>. The secondary windings of the transformers 16, 17, 18 are designed to cooperate with the inherent reactances of the circuits, including the internal valve-capacities, to select the intermediate frequency. The filaments are in series and the grids are tapped off the filament circuit at such points as will give the required grid bias.
GB3208125A 1925-12-18 1925-12-18 Improvements in radio receiving systems Expired GB267617A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB3208125A GB267617A (en) 1925-12-18 1925-12-18 Improvements in radio receiving systems

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3208125A GB267617A (en) 1925-12-18 1925-12-18 Improvements in radio receiving systems

Publications (1)

Publication Number Publication Date
GB267617A true GB267617A (en) 1927-03-18

Family

ID=10332913

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3208125A Expired GB267617A (en) 1925-12-18 1925-12-18 Improvements in radio receiving systems

Country Status (1)

Country Link
GB (1) GB267617A (en)

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