GB680824A - Improvements relating to band-pass coupling circuits - Google Patents

Improvements relating to band-pass coupling circuits

Info

Publication number
GB680824A
GB680824A GB2996749A GB2996749A GB680824A GB 680824 A GB680824 A GB 680824A GB 2996749 A GB2996749 A GB 2996749A GB 2996749 A GB2996749 A GB 2996749A GB 680824 A GB680824 A GB 680824A
Authority
GB
United Kingdom
Prior art keywords
coupling
band
transformers
circuits
pass
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
GB2996749A
Inventor
Albert George O'dell
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.)
EMI Ltd
Electrical and Musical Industries Ltd
Original Assignee
EMI Ltd
Electrical and Musical 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 EMI Ltd, Electrical and Musical Industries Ltd filed Critical EMI Ltd
Priority to GB2996749A priority Critical patent/GB680824A/en
Publication of GB680824A publication Critical patent/GB680824A/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

Landscapes

  • Superheterodyne Receivers (AREA)
  • Circuits Of Receivers In General (AREA)

Abstract

680,824. Radio receiving circuits. ELECTRIC & MUSICAL INDUSTRIES, Ltd. Oct. 11, 1950 [Nov. 23, 1949], No. 29967/49. Classes 40 (v) and 40 (vi). [Also in Group XL (b)] In a band-pass coupling circuit comprising first and second transformers 3, 4 respectively, each having tuned primary and secondary windings-resonating with condensers 7, 13 and 25, 18 respectively-and wherein means are provided for varying the coupling between the primary and secondary circuits of the respective transformers to vary the pass-band of the circuit, the coupling between the secondary of the first transformer and primary of the second takes the form of a shunt resistance which is adjustable to enable the gain to be maintained relatively constant when the passband is altered. Variation of the pass-band is effected by switches 10, 21 which, in the position shown, introduce additional coupling condensers 8, 20 into the circuits of the respective transformers ; switch 15 at the same time introduces additional resistance 16 in parallel with the resistance 17 coupling the transformers together, so as to maintain the gain constant. Switches 10, 15, 21 may be ganged with a tone-control switch (not shown). Padding condensers 9, 19 are provided to correct the tuning of the respective secondary circuits, when switches 10, 21 are reversed.
GB2996749A 1949-11-23 1949-11-23 Improvements relating to band-pass coupling circuits Expired GB680824A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2996749A GB680824A (en) 1949-11-23 1949-11-23 Improvements relating to band-pass coupling circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2996749A GB680824A (en) 1949-11-23 1949-11-23 Improvements relating to band-pass coupling circuits

Publications (1)

Publication Number Publication Date
GB680824A true GB680824A (en) 1952-10-15

Family

ID=10300108

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2996749A Expired GB680824A (en) 1949-11-23 1949-11-23 Improvements relating to band-pass coupling circuits

Country Status (1)

Country Link
GB (1) GB680824A (en)

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