GB514640A - Image-suppression system for wireless receivers - Google Patents

Image-suppression system for wireless receivers

Info

Publication number
GB514640A
GB514640A GB14078/38A GB1407838A GB514640A GB 514640 A GB514640 A GB 514640A GB 14078/38 A GB14078/38 A GB 14078/38A GB 1407838 A GB1407838 A GB 1407838A GB 514640 A GB514640 A GB 514640A
Authority
GB
United Kingdom
Prior art keywords
coil
circuit
tube
tuned
layer bank
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
GB14078/38A
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.)
Johnson Laboratories Inc
Original Assignee
Johnson Laboratories 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 Johnson Laboratories Inc filed Critical Johnson Laboratories Inc
Publication of GB514640A publication Critical patent/GB514640A/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
    • H03D7/18—Modifications of frequency-changers for eliminating image frequencies

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)

Abstract

514,640. Wireless receiving sets ; impedance networks. JOHNSON LABORATORIES Inc. May 11, 1938, No. 14078. Convention date, May 17, 1937. [Classes 40 (iii) and 40 (v)] [Also in Group XXXV] In a superheterodyne receiver a parallelresonant circuit 3, 4, 6 is tuned to a desired . signal, and a series-resonant trap circuit 3, 6 is simultaneously tuned to an image signal by means of an adjustable common core 5. The capacitor 6 enables the circuit 3, 4, 6 to be aligned with the other circuits of the receiver, preferably near the high-frequency end of the tuning range. Electric inductances.-The self and mutual inductances of the coils 3, 4 are simultaneously varied in the desired relationship by movement of the core 5 by means of a lever 20. Coil 3 is a 3-layer bank-wound coil on a tube 15, and coil 4 is a 2-layer bank-wound coil on a tube 14. The variable condenser 6 is mounted on the base of the assembly.
GB14078/38A 1937-05-17 1938-05-11 Image-suppression system for wireless receivers Expired GB514640A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US143107A US2131976A (en) 1937-05-17 1937-05-17 Image suppression system

Publications (1)

Publication Number Publication Date
GB514640A true GB514640A (en) 1939-11-14

Family

ID=22502627

Family Applications (1)

Application Number Title Priority Date Filing Date
GB14078/38A Expired GB514640A (en) 1937-05-17 1938-05-11 Image-suppression system for wireless receivers

Country Status (5)

Country Link
US (1) US2131976A (en)
CH (1) CH207423A (en)
FR (1) FR838061A (en)
GB (1) GB514640A (en)
NL (1) NL49884C (en)

Families Citing this family (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE971852C (en) * 1938-08-17 1959-04-09 Georg Von Schaub Tuning device, especially for tuning radio devices
US2486986A (en) * 1943-06-28 1949-11-01 Rca Corp Permeability tuning system
US2475032A (en) * 1945-03-17 1949-07-05 Rca Corp Variable permeability tuning system
US2512481A (en) * 1947-06-25 1950-06-20 Avco Mfg Corp Antenna input circuits
US2542495A (en) * 1947-11-19 1951-02-20 Sylvania Electric Prod Image reduction circuit
US2673933A (en) * 1951-05-31 1954-03-30 Designers For Industry Inc Radio circuit tuning device
GB847255A (en) * 1957-10-15 1960-09-07 Gen Electric Co Ltd Improvements in or relating to superheterodyne radio receivers
US3101463A (en) * 1958-12-01 1963-08-20 Gen Motors Corp Shielded electrical coil assembly
IT1074089B (en) * 1976-12-16 1985-04-17 Sits Soc It Telecom Siemens BAND-REJECT FILTER FOR TELECOMMUNICATIONS SYSTEMS

Also Published As

Publication number Publication date
US2131976A (en) 1938-10-04
FR838061A (en) 1939-02-27
CH207423A (en) 1939-10-31
NL49884C (en)

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