GB639686A - Improvements relating to tuning means for mixed radio receivers adapted for amplitude modulation or frequency modulation - Google Patents

Improvements relating to tuning means for mixed radio receivers adapted for amplitude modulation or frequency modulation

Info

Publication number
GB639686A
GB639686A GB32692/47A GB3269247A GB639686A GB 639686 A GB639686 A GB 639686A GB 32692/47 A GB32692/47 A GB 32692/47A GB 3269247 A GB3269247 A GB 3269247A GB 639686 A GB639686 A GB 639686A
Authority
GB
United Kingdom
Prior art keywords
waves
tuning
fed
frequency
radio receivers
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
GB32692/47A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston Co 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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Publication of GB639686A publication Critical patent/GB639686A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/02—Details
    • H03J3/12—Electrically-operated arrangements for indicating correct tuning
    • H03J3/14—Visual indication, e.g. magic eye
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
    • H03D5/00—Circuits for demodulating amplitude-modulated or angle-modulated oscillations at will
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G5/00—Tone control or bandwidth control in amplifiers
    • H03G5/16—Automatic control
    • H03G5/24—Automatic control in frequency-selective amplifiers
    • H03G5/26—Automatic control in frequency-selective amplifiers having discharge tubes

Landscapes

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

Abstract

639,686. Frequency and amplitude modulation receivers. BRITISH THOMSON-HOUSTON CO., Ltd. Dec. 11, 1947, No. 32692. Convention date, Aug. 30, 1945. [Class 40 (v)] In radio receivers adapted for reception of either frequency-modulated or amplitude-modulated waves, a tuning indicator, fed from the I.F. stages through a narrow pass-band filter and rectifier, is available for precision tuning whether F.M. or A.M. signals are being received. As shown, the I.F. stage 5 feeds F.M. waves to a limiter 6, discriminator-detector 7 and audio amplifier 8. The I.F. wave is also fed to a pentode amplifier 17 which has its anode tapped on the primary coil 28 of a narrow pass-band filter constituted by coupled circuits 27, 28; 29, 30. The secondary coil 29 is tapped to a diode detector 31 with its cathode connected through a smoothing circuit 34, 35 to a tuning indicator 13 which may be of the magic eye type, and indicates accuracy of tuning whether the received waves are of the F.M. or A.M. type. When the received waves are of the latter type, the modulation signal is developed across the diode resistor 32 and is fed through the switch S to the input of the audio amplifier 8.
GB32692/47A 1945-08-30 1947-12-11 Improvements relating to tuning means for mixed radio receivers adapted for amplitude modulation or frequency modulation Expired GB639686A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR918638T 1945-08-30

Publications (1)

Publication Number Publication Date
GB639686A true GB639686A (en) 1950-07-05

Family

ID=9424592

Family Applications (1)

Application Number Title Priority Date Filing Date
GB32692/47A Expired GB639686A (en) 1945-08-30 1947-12-11 Improvements relating to tuning means for mixed radio receivers adapted for amplitude modulation or frequency modulation

Country Status (3)

Country Link
BE (1) BE470524A (en)
FR (1) FR918638A (en)
GB (1) GB639686A (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2165409B (en) * 1984-10-09 1988-07-20 Plessey Co Plc Improvements relating to radio receivers

Also Published As

Publication number Publication date
BE470524A (en)
FR918638A (en) 1947-02-13

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