GB388632A - Improvements in devices for wave-band switching for radio receiving apparatus - Google Patents

Improvements in devices for wave-band switching for radio receiving apparatus

Info

Publication number
GB388632A
GB388632A GB16811/32A GB1681132A GB388632A GB 388632 A GB388632 A GB 388632A GB 16811/32 A GB16811/32 A GB 16811/32A GB 1681132 A GB1681132 A GB 1681132A GB 388632 A GB388632 A GB 388632A
Authority
GB
United Kingdom
Prior art keywords
parallel
series
drum
coils
lead
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
GB16811/32A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB388632A publication Critical patent/GB388632A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F21/00—Variable inductances or transformers of the signal type
    • H01F21/12—Variable inductances or transformers of the signal type discontinuously variable, e.g. tapped

Landscapes

  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Transmitters (AREA)
  • Coils Or Transformers For Communication (AREA)

Abstract

388,632. Inductances. FREDERIKSEN, F. M., Skorping, Aalborg, Denmark. June 14, 1932, No. 16811. Convention date, Sept. 3, 1931. [Class 37.] A rotatable wave-band switch for radio receiving-apparatus has three operative positions for connecting a set of coils in series, parallel, or series-parallel respectively and means for centre-tapping the coil combination in use. As shown applied to a transformer, a rotatable insulating drum 5 carries sets of contact pins 12 passing through the drum, bars 14 embedded in its surface, and short cross-connected bars 13, all of which are engageable with spring contacts 7 connected to two sets of coils 8, 9, 10, 11, which form the transformer windings, in such a way that each set of coils is connected in series, parallel, or series-parallel according as the contacts 12, 14, or 13 respectively are brought into engagement with the contacts 7. Centre-tapping of the parallel combination is provided by a lead 23 and a spring blade 24, which is connected by a short bar 14, Fig. 5, with a spring blade 20 and lead 21, and that of the other two combinations by a lead 18, spring blade 19, and a conductor 13a, Fig. 5, embedded in the drum, which again establishes connection with the blade 20. A variable condenser 17 connected in the primary circuit may be arranged to be operated by rotation of the drum.
GB16811/32A 1931-09-03 1932-06-14 Improvements in devices for wave-band switching for radio receiving apparatus Expired GB388632A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DK388632X 1931-09-03

Publications (1)

Publication Number Publication Date
GB388632A true GB388632A (en) 1933-03-02

Family

ID=8150799

Family Applications (1)

Application Number Title Priority Date Filing Date
GB16811/32A Expired GB388632A (en) 1931-09-03 1932-06-14 Improvements in devices for wave-band switching for radio receiving apparatus

Country Status (1)

Country Link
GB (1) GB388632A (en)

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