GB580782A - Improvements in radio frequency transformers - Google Patents

Improvements in radio frequency transformers

Info

Publication number
GB580782A
GB580782A GB13904/44A GB1390444A GB580782A GB 580782 A GB580782 A GB 580782A GB 13904/44 A GB13904/44 A GB 13904/44A GB 1390444 A GB1390444 A GB 1390444A GB 580782 A GB580782 A GB 580782A
Authority
GB
United Kingdom
Prior art keywords
rod
coupling
slot
coils
inductance
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
GB13904/44A
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 GB580782A publication Critical patent/GB580782A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H7/00—Multiple-port networks comprising only passive electrical elements as network components
    • H03H7/01—Frequency selective two-port networks
    • H03H7/0153—Electrical filters; Controlling thereof
    • H03H7/0161—Bandpass filters
    • H03H7/0169—Intermediate frequency filters
    • H03H7/0184—Intermediate frequency filters with ferromagnetic core

Landscapes

  • Coils Or Transformers For Communication (AREA)

Abstract

580,782. Transformers. BRITISH THOMSON-HOUSTON CO., Ltd. July 20, 1944, No. 13904. Convention date, July 21, 1943. [Class 38 (ii)] A transformer for coupling high-frequency circuits in wireless receiving apparatus and which is provided with means for varying the self-inductance and mutual inductance of the windings comprises a body member 10 of copper, aluminium, or other non-magnetic conducting material having cylindrical recesses 11, 12 connected by a slot 32. In each-recess is a chamber 14 formed of magnetic material and preferably of powdered iron within which is a coil 18 wound on an insulating former 17. Fixed and movable tuning cores of powdered iron 20, 21.are arranged in each former 17 to enable the self-inductance of the coils to be varied. The body 10 acts as a one-turn link to couple the coils together, the tightness of the coupling being determined by the position of a threaded rod 34 in the slot 32. The rod 34 may be slotted throughout its length so that a maximum and minimum coupling may be obtained by a quarter revolution of the rod. A lock-nut may be provided to fix the rod in position and an adjustable screw may be fixed in the upper end of the slot 32 to limit the position of the rod and the maximum coupling between the coils.
GB13904/44A 1943-07-21 1944-07-20 Improvements in radio frequency transformers Expired GB580782A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US580782XA 1943-07-21 1943-07-21

Publications (1)

Publication Number Publication Date
GB580782A true GB580782A (en) 1946-09-19

Family

ID=22014530

Family Applications (1)

Application Number Title Priority Date Filing Date
GB13904/44A Expired GB580782A (en) 1943-07-21 1944-07-20 Improvements in radio frequency transformers

Country Status (1)

Country Link
GB (1) GB580782A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3593245A (en) * 1968-04-18 1971-07-13 Matsushita Electric Ind Co Ltd Double-tuned intermediate-frequency transformer

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3593245A (en) * 1968-04-18 1971-07-13 Matsushita Electric Ind Co Ltd Double-tuned intermediate-frequency transformer

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