GB421786A - Improvements in superheterodyne receiving sets - Google Patents

Improvements in superheterodyne receiving sets

Info

Publication number
GB421786A
GB421786A GB18732/34A GB1873234A GB421786A GB 421786 A GB421786 A GB 421786A GB 18732/34 A GB18732/34 A GB 18732/34A GB 1873234 A GB1873234 A GB 1873234A GB 421786 A GB421786 A GB 421786A
Authority
GB
United Kingdom
Prior art keywords
valve
oscillations
intermediate frequency
amplitude
grid
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
GB18732/34A
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.)
Koninklijke Philips NV
Original Assignee
Philips Gloeilampenfabrieken NV
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 Philips Gloeilampenfabrieken NV filed Critical Philips Gloeilampenfabrieken NV
Publication of GB421786A publication Critical patent/GB421786A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers without distortion of the input signal
    • H03G3/20—Automatic control
    • H03G3/22—Automatic control in amplifiers having discharge tubes
    • H03G3/225—Automatic control in amplifiers having discharge tubes controlling or controlled by the (local) oscillators of a (super)heterodyne receiver

Abstract

421,786. Valve circuits for wireless reception. NAAMLOOZE VENNOOTSCHAP PHILIPS' GLOEILAMPENFABRIEKEN, Emmasingel, Eindhoven, Holland. June 25, 1934, No. 18732. Convention date, Aug. 3, 1933. [Class 40 (v)] Automatic volume control in a super-heterodyne receiver is obtained by varying the anode voltage of the local oscillator inversely to the variation in the amplitude of the received signal. This results in a variation of the amplitude of the local oscillations to maintain the amplitude of the intermediate frequency constant. A high-frequency amplifier HV is followed by a first detector D1 which receives local oscillations from a back coupled valve 12. The intermediate frequency oscillations are amplified at MV and detected by the diode section of the diode-triode D2. The rectified output across resistance 7 is fed to the grid of the triode section of the valve D2 for amplification and is also applied to the grid of a valve 19 through a low-frequency suppressing filter F. The anode current of valve 19 thus varies in accordance with the amplitude of the intermediate frequency oscillations, and since it is in parallel with the oscillator 12, the anode voltage of the oscillator varies inversely to the variations of the intermediate frequency. The bias of the amplifiers HV and MV may also be controlled by the potential across the resistance 7. According to the Specification as open to inspection under Sect. 91 the high-frequency oscillations may be rectified and applied to the grid or anode of the local oscillator, or the rectified intermediate frequency oscillations may be applied to the grid of the local oscillator. This subject-matter does not appear in the Specification as accepted.
GB18732/34A 1933-08-03 1934-06-25 Improvements in superheterodyne receiving sets Expired GB421786A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL421786X 1933-08-03

Publications (1)

Publication Number Publication Date
GB421786A true GB421786A (en) 1934-12-31

Family

ID=19786074

Family Applications (1)

Application Number Title Priority Date Filing Date
GB18732/34A Expired GB421786A (en) 1933-08-03 1934-06-25 Improvements in superheterodyne receiving sets

Country Status (1)

Country Link
GB (1) GB421786A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2798947A (en) * 1954-06-04 1957-07-09 Itt Automatic level control of local oscillation in superheterodyne receiver
US2853602A (en) * 1956-09-27 1958-09-23 Hazeltine Research Inc Frequency-converter system having mixer and local oscillator gain controlled in opposite sense

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2798947A (en) * 1954-06-04 1957-07-09 Itt Automatic level control of local oscillation in superheterodyne receiver
US2853602A (en) * 1956-09-27 1958-09-23 Hazeltine Research Inc Frequency-converter system having mixer and local oscillator gain controlled in opposite sense

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