GB353421A - Improvements relating to telephone instrument circuits - Google Patents

Improvements relating to telephone instrument circuits

Info

Publication number
GB353421A
GB353421A GB1219230A GB1219230A GB353421A GB 353421 A GB353421 A GB 353421A GB 1219230 A GB1219230 A GB 1219230A GB 1219230 A GB1219230 A GB 1219230A GB 353421 A GB353421 A GB 353421A
Authority
GB
United Kingdom
Prior art keywords
coil
winding
class
windings
improvements relating
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
GB1219230A
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.)
STC PLC
Original Assignee
Standard Telephone and Cables PLC
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 Standard Telephone and Cables PLC filed Critical Standard Telephone and Cables PLC
Priority to GB1219230A priority Critical patent/GB353421A/en
Publication of GB353421A publication Critical patent/GB353421A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/58—Anti-side-tone circuits

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Near-Field Transmission Systems (AREA)

Abstract

353,421. Substation circuits. STANDARD TELEPHONES & CABLES, Ltd. and LEE, A., Columbia House, Aldwych, London. April 17, 1930, No. 12192. [Class 40 (iv).] In an anti-side-tone substation circuit employing a three-winding induction coil, the windings P, S, S1 are connected in series as shown so as to be capable of construction as a four-terminal unit, the receiver F is connected in shunt across the third winding S1, and the switch-hook contacts CS are so arranged that the bell B is not normally short-circuited by the coil windings. The balancing high resistance r may be in the form of an additional non-inductive winding on the coil core or an extra resistance may be eliminated by suitably proportioning coil S1 Specification 146,880, [Class 40 (iv), Telephones &c.], is referred to.
GB1219230A 1930-04-17 1930-04-17 Improvements relating to telephone instrument circuits Expired GB353421A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB1219230A GB353421A (en) 1930-04-17 1930-04-17 Improvements relating to telephone instrument circuits

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1219230A GB353421A (en) 1930-04-17 1930-04-17 Improvements relating to telephone instrument circuits

Publications (1)

Publication Number Publication Date
GB353421A true GB353421A (en) 1931-07-17

Family

ID=10000011

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1219230A Expired GB353421A (en) 1930-04-17 1930-04-17 Improvements relating to telephone instrument circuits

Country Status (1)

Country Link
GB (1) GB353421A (en)

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