GB450247A - Improvements in radio receivers - Google Patents

Improvements in radio receivers

Info

Publication number
GB450247A
GB450247A GB35660/34A GB3566034A GB450247A GB 450247 A GB450247 A GB 450247A GB 35660/34 A GB35660/34 A GB 35660/34A GB 3566034 A GB3566034 A GB 3566034A GB 450247 A GB450247 A GB 450247A
Authority
GB
United Kingdom
Prior art keywords
circuit
frequency
intermediate frequency
valves
prevented
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
GB35660/34A
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.)
Loewe Opta GmbH
Original Assignee
Loewe Opta GmbH
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 Loewe Opta GmbH filed Critical Loewe Opta GmbH
Publication of GB450247A publication Critical patent/GB450247A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/66—Amplifiers simultaneously generating oscillations of one frequency and amplifying signals of another frequency
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06—Receivers
    • H04B1/16—Circuits
    • H04B1/163—Special arrangements for the reduction of the damping of resonant circuits of receivers

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Superheterodyne Receivers (AREA)

Abstract

450,247. Valve circuits for wireless reception. RADIOAKT. - GES. D. S. LOEWE, 10, Wiesenweg, Steglitz, Berlin. Dec. 12, 1934, No. 35660. Convention date, Dec. 13, 1933. [Class 40 (v)] In a receiver employing a tight back-coupling self oscillation is prevented by causing the receiving valve to oscillate at a frequency higher than that at which the back-coupling is effected. Fig. 1 shows a frequency changer 1 in which the intermediate frequency circuit 7, 8 is back-coupled and the local oscillator circuit 4, 5 serves to prevent self oscillation at the intermediate frequency. Radiation of the local oscillation is prevented by the balancing condenser 20. In a modification, Fig. 2 (not shown), a similar double valve is employed and the grid 3 is associated with an oscillating circuit and a circuit tuned to the signal. Fig. 3 shows an arrangement in which a pair of valves 22, 23 oscillate in parallel at the frequency of circuit 27, 28. The signal is applied to the valves in push-pull from an aerial 41 while the intermediate frequency circuit 24, 25 is backcoupled by condensers 31, 32. In a modification, Fig. 4 (not shown), the signal is applied to the pair of valves in phase and the local oscillation is in push-pull and chokes are provided to keep the impedance of the circuit of the anodes high at this frequency. The amount of backcoupling at the intermediate frequency may be adjustable to vary selectivity, the consequent volume variation being prevented by the automatic volume control.
GB35660/34A 1933-12-13 1934-12-12 Improvements in radio receivers Expired GB450247A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE194293X 1933-12-13

Publications (1)

Publication Number Publication Date
GB450247A true GB450247A (en) 1936-07-13

Family

ID=5743584

Family Applications (1)

Application Number Title Priority Date Filing Date
GB35660/34A Expired GB450247A (en) 1933-12-13 1934-12-12 Improvements in radio receivers

Country Status (5)

Country Link
US (1) US2107395A (en)
BE (1) BE406777A (en)
CH (1) CH194293A (en)
GB (1) GB450247A (en)
NL (1) NL43529C (en)

Families Citing this family (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2808505A (en) * 1953-01-12 1957-10-01 Telefunken Gmbh Constant-gain amplifier system
NL72257C (en) * 1943-03-27
BE466841A (en) * 1943-07-23
CH246142A (en) * 1943-10-18 1946-12-15 Philips Nv Circuit which serves to receive high-frequency oscillations in at least one operating position.
NL69394C (en) * 1944-08-08
US2510165A (en) * 1945-05-04 1950-06-06 Int Standard Electric Corp Heterodyne oscillator
US2548132A (en) * 1945-07-17 1951-04-10 Sylvania Electric Prod Superheterodyne receiver employing triode converters
US2859336A (en) * 1951-10-22 1958-11-04 Philips Corp Frequency conversion of signal oscillation without use of an auxiliary local oscillation
NL164858B (en) * 1951-10-22 Egyt Gyogyszervegyeszeti Gyar PROCEDURE FOR PREPARING A DERIVATIVE OF 2,10- -DICHLOR-6-CARBOXY-12H-DIBENZO (D, G) (1,3) DIOXOCIN OR ITS SALT AND METHOD FOR PREPARING A SUBSTANCE ACTION PHARMACEUTICAL PREPARATION USING SUCH A CONNECTION.
DE972522C (en) * 1951-12-04 1959-08-06 Telefunken Gmbh Mixing circuit for overlay receivers, especially for VHF reception
US2753449A (en) * 1952-01-30 1956-07-03 Gail E Boggs Superheterodyne mixer with negative feedback for stabilizing conversion gain
NL105942C (en) * 1956-08-24
DE1083354B (en) * 1958-03-20 1960-06-15 Telefunken Gmbh Circuit arrangement for de-damping the tuned IF circuit of a self-oscillating mixer with transistor
US3332022A (en) * 1963-10-21 1967-07-18 Blonder Tongue Elect Tunnel diode converter system

Also Published As

Publication number Publication date
US2107395A (en) 1938-02-08
CH194293A (en) 1937-11-30
NL43529C (en)
BE406777A (en)

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