GB698397A - Improvements in or relating to superheterodyne receiving circuits - Google Patents

Improvements in or relating to superheterodyne receiving circuits

Info

Publication number
GB698397A
GB698397A GB16240/52A GB1624052A GB698397A GB 698397 A GB698397 A GB 698397A GB 16240/52 A GB16240/52 A GB 16240/52A GB 1624052 A GB1624052 A GB 1624052A GB 698397 A GB698397 A GB 698397A
Authority
GB
United Kingdom
Prior art keywords
circuit
valve
inductance
tap
coil
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
GB16240/52A
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.)
Philips Electrical Industries Ltd
Original Assignee
Philips Electrical Industries 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 Philips Electrical Industries Ltd filed Critical Philips Electrical Industries Ltd
Publication of GB698397A publication Critical patent/GB698397A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B15/00—Suppression or limitation of noise or interference
    • H04B15/02—Reducing interference from electric apparatus by means located at or near the interfering apparatus
    • H04B15/04—Reducing interference from electric apparatus by means located at or near the interfering apparatus the interference being caused by substantially sinusoidal oscillations, e.g. in a receiver or in a tape-recorder
    • H04B15/06—Reducing interference from electric apparatus by means located at or near the interfering apparatus the interference being caused by substantially sinusoidal oscillations, e.g. in a receiver or in a tape-recorder by local oscillators of receivers
    • 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)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Superheterodyne Receivers (AREA)
  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)

Abstract

698,397. Radio receiving circuits. PHILIPS ELECTRICAL INDUSTRIES, Ltd. June 27, 1952 [July 2, 1951], No. 16240/52. Class 40 (v). In a frequency-changing circuit comprising a valve acting both as mixer and local oscillator, having an inductive back-coupling between the inductance 17 of the tuned local oscillator circuit 17, 18, 19 which is in the circuit of a currentcarrying electrode, and a coil 5 in the circuit of a control grid, the current-carrying electrode is connected to a tap on the inductance 17. The incoming signal is applied to a tap on the coil 5, which forms a balanced bridge circuit in conjunction with the input impedance of the valve and a balancing impedance comprising resistance 13 and condenser 14. The oscillator circuit 17, 18, 19 is connected via an I.F. output circuit 15 to the anode 8 of the valve and is also coupled via condenser 20 to both screens 10, 12. Automatic gain control may be applied to an intermediate control grid 11. The arrangement reduces radiation of local oscillations and also " demixing " effects in the valve. In a modification, Fig. 2 (not shown), the screens 10, 12 are connected to the tap on the inductance 17, but the anode is taken to the top of this coil. These connections may alternatively be reversed.
GB16240/52A 1951-07-02 1952-06-27 Improvements in or relating to superheterodyne receiving circuits Expired GB698397A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL698397X 1951-07-02

Publications (1)

Publication Number Publication Date
GB698397A true GB698397A (en) 1953-10-14

Family

ID=19808952

Family Applications (1)

Application Number Title Priority Date Filing Date
GB16240/52A Expired GB698397A (en) 1951-07-02 1952-06-27 Improvements in or relating to superheterodyne receiving circuits

Country Status (4)

Country Link
US (1) US2725468A (en)
DE (1) DE968562C (en)
FR (1) FR1059342A (en)
GB (1) GB698397A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2812432A (en) * 1953-12-09 1957-11-05 Philips Corp Self-oscillating mixer using tunable long lines
US2835797A (en) * 1953-11-28 1958-05-20 Philips Corp Circuit-arrangement for frequencytransformation of oscillations of very high frequency

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR591694A (en) * 1925-01-15 1925-07-16 Etablissements Ducretet Soc D Frequency changer device
GB285130A (en) * 1926-11-09 1928-02-09 Richard Leonard Howard Flander Improvements in or relating to portable or semi-portable selfcontained wireless receiving apparatus
FR673718A (en) * 1928-08-25 1930-01-18 Radiomodulation by lamps with low internal capacity
US1972189A (en) * 1929-09-25 1934-09-04 Radio Patents Corp Radioreceiver
BE393019A (en) * 1931-12-14
US2034513A (en) * 1933-04-01 1936-03-17 Rca Corp Combined detector oscillator circuit
US2049777A (en) * 1933-07-21 1936-08-04 Rca Corp Oscillator-detector
US2051177A (en) * 1935-02-13 1936-08-18 Radio Patents Corp Electron coupled circuit

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2835797A (en) * 1953-11-28 1958-05-20 Philips Corp Circuit-arrangement for frequencytransformation of oscillations of very high frequency
US2812432A (en) * 1953-12-09 1957-11-05 Philips Corp Self-oscillating mixer using tunable long lines

Also Published As

Publication number Publication date
FR1059342A (en) 1954-03-24
US2725468A (en) 1955-11-29
DE968562C (en) 1958-03-06

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